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golang
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1.22.0
/
src
/
runtime
/
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..
📄
HACKING.md
(13.85 KB)
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Makefile
(178 B)
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abi_test.go
(2.83 KB)
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alg.go
(10.99 KB)
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align_runtime_test.go
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align_test.go
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arena.go
(31.66 KB)
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arena_test.go
(13.39 KB)
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asan
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asan.go
(1.55 KB)
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asan0.go
(760 B)
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asan_amd64.s
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asan_arm64.s
(2.14 KB)
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asan_loong64.s
(2.12 KB)
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asan_ppc64le.s
(2.75 KB)
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asan_riscv64.s
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asm.s
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asm_386.s
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asm_amd64.h
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asm_amd64.s
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asm_arm.s
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asm_arm64.s
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asm_loong64.s
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asm_mips64x.s
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asm_mipsx.s
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asm_ppc64x.h
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asm_ppc64x.s
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asm_riscv64.s
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asm_s390x.s
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asm_wasm.s
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atomic_arm64.s
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atomic_loong64.s
(245 B)
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atomic_mips64x.s
(300 B)
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atomic_mipsx.s
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atomic_pointer.go
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atomic_ppc64x.s
(437 B)
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atomic_riscv64.s
(275 B)
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auxv_none.go
(298 B)
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callers_test.go
(12.13 KB)
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cgo
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cgo.go
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cgo_mmap.go
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cgo_ppc64x.go
(418 B)
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cgo_sigaction.go
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cgocall.go
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cgocallback.go
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cgocheck.go
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chan.go
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chan_test.go
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chanbarrier_test.go
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checkptr.go
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checkptr_test.go
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closure_test.go
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compiler.go
(410 B)
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complex.go
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complex_test.go
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conv_wasm_test.go
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coro.go
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coverage
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covercounter.go
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covermeta.go
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cpuflags.go
(810 B)
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cpuflags_amd64.go
(533 B)
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cpuflags_arm64.go
(312 B)
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cpuprof.go
(7.94 KB)
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cputicks.go
(437 B)
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crash_cgo_test.go
(23.35 KB)
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crash_test.go
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crash_unix_test.go
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create_file_nounix.go
(305 B)
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create_file_unix.go
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debug
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debug.go
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debug_test.go
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debugcall.go
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debuglog.go
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debuglog_off.go
(357 B)
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debuglog_on.go
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debuglog_test.go
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defer_test.go
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defs1_linux.go
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defs1_netbsd_386.go
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defs1_netbsd_amd64.go
(3.14 KB)
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defs1_netbsd_arm.go
(3.03 KB)
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defs1_netbsd_arm64.go
(3.25 KB)
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defs1_solaris_amd64.go
(4.01 KB)
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defs2_linux.go
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defs3_linux.go
(1.09 KB)
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defs_aix.go
(4.17 KB)
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defs_aix_ppc64.go
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defs_arm_linux.go
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defs_darwin.go
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defs_darwin_amd64.go
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defs_darwin_arm64.go
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defs_dragonfly.go
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defs_dragonfly_amd64.go
(3.41 KB)
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defs_freebsd.go
(3.96 KB)
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defs_freebsd_386.go
(4.52 KB)
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defs_freebsd_amd64.go
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defs_freebsd_arm.go
(3.92 KB)
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defs_freebsd_arm64.go
(4.18 KB)
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defs_freebsd_riscv64.go
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defs_illumos_amd64.go
(285 B)
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defs_linux.go
(2.92 KB)
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defs_linux_386.go
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defs_linux_amd64.go
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defs_linux_arm.go
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defs_linux_arm64.go
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defs_linux_loong64.go
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defs_linux_mips64x.go
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defs_linux_mipsx.go
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defs_linux_ppc64.go
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defs_linux_ppc64le.go
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defs_linux_riscv64.go
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defs_linux_s390x.go
(3.16 KB)
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defs_netbsd.go
(2.83 KB)
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defs_netbsd_386.go
(855 B)
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defs_netbsd_amd64.go
(1.01 KB)
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defs_netbsd_arm.go
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defs_openbsd.go
(3.06 KB)
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defs_openbsd_386.go
(2.91 KB)
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defs_openbsd_amd64.go
(3.11 KB)
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defs_openbsd_arm.go
(3.03 KB)
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defs_openbsd_arm64.go
(2.78 KB)
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defs_openbsd_mips64.go
(2.75 KB)
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defs_openbsd_ppc64.go
(3 KB)
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defs_openbsd_riscv64.go
(2.89 KB)
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defs_plan9_386.go
(1.63 KB)
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defs_plan9_amd64.go
(1.82 KB)
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defs_plan9_arm.go
(1.73 KB)
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defs_solaris.go
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defs_solaris_amd64.go
(1004 B)
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defs_windows.go
(2.25 KB)
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defs_windows_386.go
(2.28 KB)
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defs_windows_amd64.go
(3.19 KB)
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defs_windows_arm.go
(2.57 KB)
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defs_windows_arm64.go
(3.07 KB)
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duff_386.s
(8.24 KB)
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duff_amd64.s
(5.64 KB)
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duff_arm.s
(7.11 KB)
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duff_arm64.s
(5.27 KB)
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duff_loong64.s
(11.9 KB)
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duff_mips64x.s
(11.28 KB)
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duff_ppc64x.s
(7.06 KB)
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duff_riscv64.s
(11.4 KB)
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duff_s390x.s
(507 B)
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ehooks_test.go
(2.04 KB)
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env_plan9.go
(3 KB)
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env_posix.go
(1.56 KB)
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env_test.go
(1.16 KB)
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error.go
(9.29 KB)
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example_test.go
(1.55 KB)
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exithook.go
(2.32 KB)
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export_aix_test.go
(207 B)
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export_arm_test.go
(226 B)
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export_darwin_test.go
(207 B)
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export_debug_amd64_test.go
(3.6 KB)
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export_debug_arm64_test.go
(3.49 KB)
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export_debug_ppc64le_test.go
(3.5 KB)
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export_debug_test.go
(5.07 KB)
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export_debuglog_test.go
(1.27 KB)
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export_linux_test.go
(378 B)
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export_mmap_test.go
(429 B)
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export_pipe2_test.go
(310 B)
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export_pipe_test.go
(219 B)
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export_test.go
(50.52 KB)
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export_unix_test.go
(2.27 KB)
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export_windows_test.go
(903 B)
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extern.go
(18.58 KB)
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fastlog2.go
(1.22 KB)
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fastlog2_test.go
(784 B)
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fastlog2table.go
(904 B)
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fds_nonunix.go
(256 B)
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fds_test.go
(1.43 KB)
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fds_unix.go
(1.27 KB)
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float.go
(1.35 KB)
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float_test.go
(699 B)
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funcdata.h
(2.53 KB)
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gc_test.go
(20.32 KB)
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gcinfo_test.go
(5.95 KB)
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go_tls.h
(366 B)
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hash32.go
(1.58 KB)
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hash64.go
(1.95 KB)
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hash_test.go
(17.24 KB)
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heap_test.go
(529 B)
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heapdump.go
(17.88 KB)
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histogram.go
(7.3 KB)
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histogram_test.go
(3.51 KB)
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iface.go
(20.92 KB)
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iface_test.go
(7.45 KB)
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import_test.go
(1.42 KB)
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importx_test.go
(763 B)
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internal
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lfstack.go
(2.03 KB)
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lfstack_test.go
(2.74 KB)
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libfuzzer.go
(6.34 KB)
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libfuzzer_amd64.s
(5.03 KB)
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libfuzzer_arm64.s
(3.15 KB)
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lock_futex.go
(5.4 KB)
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lock_js.go
(7.28 KB)
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lock_sema.go
(6.75 KB)
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lock_wasip1.go
(2.01 KB)
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lockrank.go
(18.19 KB)
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lockrank_off.go
(1.17 KB)
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lockrank_on.go
(10.27 KB)
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lockrank_test.go
(856 B)
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malloc.go
(58.5 KB)
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malloc_test.go
(10.64 KB)
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map.go
(52.17 KB)
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map_benchmark_test.go
(10.59 KB)
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map_fast32.go
(12.74 KB)
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map_fast64.go
(12.92 KB)
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map_faststr.go
(14.32 KB)
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map_test.go
(31.75 KB)
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mbarrier.go
(13.78 KB)
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mbitmap.go
(22.54 KB)
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mbitmap_allocheaders.go
(44.67 KB)
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mbitmap_noallocheaders.go
(28.95 KB)
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mcache.go
(10 KB)
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mcentral.go
(8.05 KB)
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mcheckmark.go
(2.85 KB)
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mem.go
(6.72 KB)
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mem_aix.go
(2.01 KB)
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mem_bsd.go
(2.21 KB)
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mem_darwin.go
(1.96 KB)
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mem_js.go
(457 B)
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mem_linux.go
(4.98 KB)
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mem_plan9.go
(447 B)
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mem_sbrk.go
(4.19 KB)
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mem_wasip1.go
(392 B)
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mem_wasm.go
(488 B)
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mem_windows.go
(3.88 KB)
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memclr_386.s
(2.38 KB)
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memclr_amd64.s
(4.91 KB)
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memclr_arm.s
(2.6 KB)
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memclr_arm64.s
(3.62 KB)
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memclr_loong64.s
(843 B)
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memclr_mips64x.s
(1.72 KB)
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memclr_mipsx.s
(1.32 KB)
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memclr_plan9_386.s
(983 B)
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memclr_plan9_amd64.s
(511 B)
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memclr_ppc64x.s
(4.44 KB)
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memclr_riscv64.s
(1.71 KB)
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memclr_s390x.s
(1.96 KB)
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memclr_wasm.s
(485 B)
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memmove_386.s
(4.42 KB)
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memmove_amd64.s
(12.48 KB)
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memmove_arm.s
(5.9 KB)
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memmove_arm64.s
(5.96 KB)
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memmove_linux_amd64_test.go
(1.53 KB)
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memmove_loong64.s
(1.87 KB)
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memmove_mips64x.s
(1.83 KB)
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memmove_mipsx.s
(4.4 KB)
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memmove_plan9_386.s
(3.06 KB)
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memmove_plan9_amd64.s
(3.04 KB)
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memmove_ppc64x.s
(4.91 KB)
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memmove_riscv64.s
(5.46 KB)
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memmove_s390x.s
(2.92 KB)
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memmove_test.go
(21.23 KB)
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memmove_wasm.s
(479 B)
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metrics
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metrics.go
(26.01 KB)
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metrics_test.go
(42.46 KB)
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mfinal.go
(18.91 KB)
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mfinal_test.go
(5.57 KB)
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mfixalloc.go
(3.13 KB)
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mgc.go
(59.29 KB)
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mgclimit.go
(17.28 KB)
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mgclimit_test.go
(9.02 KB)
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mgcmark.go
(53.07 KB)
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mgcpacer.go
(55.36 KB)
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mgcpacer_test.go
(39.26 KB)
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mgcscavenge.go
(52.32 KB)
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mgcscavenge_test.go
(25.2 KB)
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mgcstack.go
(10.58 KB)
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mgcsweep.go
(32.26 KB)
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mgcwork.go
(12.89 KB)
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mheap.go
(72.64 KB)
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minmax.go
(1.46 KB)
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minmax_test.go
(3.31 KB)
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mkduff.go
(8.04 KB)
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mkfastlog2table.go
(3.08 KB)
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mklockrank.go
(9 KB)
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mkpreempt.go
(15.33 KB)
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mksizeclasses.go
(9.52 KB)
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mmap.go
(844 B)
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mpagealloc.go
(39.23 KB)
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mpagealloc_32bit.go
(4.56 KB)
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mpagealloc_64bit.go
(9.34 KB)
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mpagealloc_test.go
(32.59 KB)
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mpagecache.go
(5.59 KB)
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mpagecache_test.go
(10.79 KB)
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mpallocbits.go
(12.58 KB)
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mpallocbits_test.go
(13.69 KB)
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mprof.go
(47.4 KB)
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mranges.go
(14.46 KB)
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mranges_test.go
(5.68 KB)
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msan
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msan.go
(1.5 KB)
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msan0.go
(725 B)
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msan_amd64.s
(2.3 KB)
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msan_arm64.s
(1.98 KB)
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msan_loong64.s
(1.96 KB)
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msize_allocheaders.go
(1.32 KB)
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msize_noallocheaders.go
(915 B)
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mspanset.go
(13.12 KB)
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mstats.go
(33.81 KB)
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mwbbuf.go
(8.13 KB)
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nbpipe_pipe.go
(405 B)
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nbpipe_pipe2.go
(344 B)
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nbpipe_pipe_test.go
(706 B)
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nbpipe_test.go
(1.99 KB)
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net_plan9.go
(645 B)
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netpoll.go
(20.55 KB)
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netpoll_aix.go
(5.06 KB)
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netpoll_epoll.go
(4.4 KB)
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netpoll_fake.go
(664 B)
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netpoll_kqueue.go
(5.62 KB)
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netpoll_os_test.go
(520 B)
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netpoll_solaris.go
(11.2 KB)
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netpoll_stub.go
(1.48 KB)
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netpoll_wasip1.go
(6.08 KB)
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netpoll_windows.go
(4.01 KB)
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nonwindows_stub.go
(729 B)
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norace_linux_test.go
(915 B)
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norace_test.go
(983 B)
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numcpu_freebsd_test.go
(381 B)
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os2_aix.go
(20.88 KB)
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os2_freebsd.go
(302 B)
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os2_openbsd.go
(296 B)
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os2_plan9.go
(1.48 KB)
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os2_solaris.go
(320 B)
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os3_plan9.go
(3.94 KB)
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os3_solaris.go
(17.59 KB)
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os_aix.go
(8.89 KB)
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os_android.go
(463 B)
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os_darwin.go
(11.92 KB)
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os_darwin_arm64.go
(329 B)
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os_dragonfly.go
(7.14 KB)
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os_freebsd.go
(11.64 KB)
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os_freebsd2.go
(603 B)
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os_freebsd_amd64.go
(658 B)
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os_freebsd_arm.go
(1.45 KB)
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os_freebsd_arm64.go
(320 B)
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os_freebsd_noauxv.go
(241 B)
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os_freebsd_riscv64.go
(198 B)
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os_illumos.go
(3.93 KB)
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os_js.go
(767 B)
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os_linux.go
(25.71 KB)
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os_linux_arm.go
(1.51 KB)
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os_linux_arm64.go
(478 B)
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os_linux_be64.go
(806 B)
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os_linux_generic.go
(870 B)
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os_linux_loong64.go
(263 B)
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os_linux_mips64x.go
(996 B)
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os_linux_mipsx.go
(987 B)
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os_linux_noauxv.go
(337 B)
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os_linux_novdso.go
(347 B)
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os_linux_ppc64x.go
(526 B)
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os_linux_riscv64.go
(198 B)
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os_linux_s390x.go
(825 B)
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os_linux_x86.go
(234 B)
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os_netbsd.go
(10.12 KB)
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os_netbsd_386.go
(617 B)
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os_netbsd_amd64.go
(614 B)
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os_netbsd_arm.go
(1.07 KB)
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os_netbsd_arm64.go
(769 B)
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os_nonopenbsd.go
(437 B)
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os_only_solaris.go
(357 B)
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os_openbsd.go
(6.23 KB)
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os_openbsd_arm.go
(662 B)
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os_openbsd_arm64.go
(329 B)
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os_openbsd_libc.go
(1.49 KB)
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os_openbsd_mips64.go
(329 B)
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os_openbsd_syscall.go
(1.36 KB)
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os_openbsd_syscall1.go
(441 B)
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os_openbsd_syscall2.go
(2.51 KB)
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os_plan9.go
(10.18 KB)
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os_plan9_arm.go
(375 B)
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os_solaris.go
(6.62 KB)
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os_unix.go
(436 B)
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os_unix_nonlinux.go
(374 B)
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os_wasip1.go
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Editing: memmove_test.go
// Copyright 2013 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package runtime_test import ( "crypto/rand" "encoding/binary" "fmt" "internal/race" "internal/testenv" . "runtime" "sync/atomic" "testing" "unsafe" ) func TestMemmove(t *testing.T) { if *flagQuick { t.Skip("-quick") } t.Parallel() size := 256 if testing.Short() { size = 128 + 16 } src := make([]byte, size) dst := make([]byte, size) for i := 0; i < size; i++ { src[i] = byte(128 + (i & 127)) } for i := 0; i < size; i++ { dst[i] = byte(i & 127) } for n := 0; n <= size; n++ { for x := 0; x <= size-n; x++ { // offset in src for y := 0; y <= size-n; y++ { // offset in dst copy(dst[y:y+n], src[x:x+n]) for i := 0; i < y; i++ { if dst[i] != byte(i&127) { t.Fatalf("prefix dst[%d] = %d", i, dst[i]) } } for i := y; i < y+n; i++ { if dst[i] != byte(128+((i-y+x)&127)) { t.Fatalf("copied dst[%d] = %d", i, dst[i]) } dst[i] = byte(i & 127) // reset dst } for i := y + n; i < size; i++ { if dst[i] != byte(i&127) { t.Fatalf("suffix dst[%d] = %d", i, dst[i]) } } } } } } func TestMemmoveAlias(t *testing.T) { if *flagQuick { t.Skip("-quick") } t.Parallel() size := 256 if testing.Short() { size = 128 + 16 } buf := make([]byte, size) for i := 0; i < size; i++ { buf[i] = byte(i) } for n := 0; n <= size; n++ { for x := 0; x <= size-n; x++ { // src offset for y := 0; y <= size-n; y++ { // dst offset copy(buf[y:y+n], buf[x:x+n]) for i := 0; i < y; i++ { if buf[i] != byte(i) { t.Fatalf("prefix buf[%d] = %d", i, buf[i]) } } for i := y; i < y+n; i++ { if buf[i] != byte(i-y+x) { t.Fatalf("copied buf[%d] = %d", i, buf[i]) } buf[i] = byte(i) // reset buf } for i := y + n; i < size; i++ { if buf[i] != byte(i) { t.Fatalf("suffix buf[%d] = %d", i, buf[i]) } } } } } } func TestMemmoveLarge0x180000(t *testing.T) { if testing.Short() && testenv.Builder() == "" { t.Skip("-short") } t.Parallel() if race.Enabled { t.Skip("skipping large memmove test under race detector") } testSize(t, 0x180000) } func TestMemmoveOverlapLarge0x120000(t *testing.T) { if testing.Short() && testenv.Builder() == "" { t.Skip("-short") } t.Parallel() if race.Enabled { t.Skip("skipping large memmove test under race detector") } testOverlap(t, 0x120000) } func testSize(t *testing.T, size int) { src := make([]byte, size) dst := make([]byte, size) _, _ = rand.Read(src) _, _ = rand.Read(dst) ref := make([]byte, size) copyref(ref, dst) for n := size - 50; n > 1; n >>= 1 { for x := 0; x <= size-n; x = x*7 + 1 { // offset in src for y := 0; y <= size-n; y = y*9 + 1 { // offset in dst copy(dst[y:y+n], src[x:x+n]) copyref(ref[y:y+n], src[x:x+n]) p := cmpb(dst, ref) if p >= 0 { t.Fatalf("Copy failed, copying from src[%d:%d] to dst[%d:%d].\nOffset %d is different, %v != %v", x, x+n, y, y+n, p, dst[p], ref[p]) } } } } } func testOverlap(t *testing.T, size int) { src := make([]byte, size) test := make([]byte, size) ref := make([]byte, size) _, _ = rand.Read(src) for n := size - 50; n > 1; n >>= 1 { for x := 0; x <= size-n; x = x*7 + 1 { // offset in src for y := 0; y <= size-n; y = y*9 + 1 { // offset in dst // Reset input copyref(test, src) copyref(ref, src) copy(test[y:y+n], test[x:x+n]) if y <= x { copyref(ref[y:y+n], ref[x:x+n]) } else { copybw(ref[y:y+n], ref[x:x+n]) } p := cmpb(test, ref) if p >= 0 { t.Fatalf("Copy failed, copying from src[%d:%d] to dst[%d:%d].\nOffset %d is different, %v != %v", x, x+n, y, y+n, p, test[p], ref[p]) } } } } } // Forward copy. func copyref(dst, src []byte) { for i, v := range src { dst[i] = v } } // Backwards copy func copybw(dst, src []byte) { if len(src) == 0 { return } for i := len(src) - 1; i >= 0; i-- { dst[i] = src[i] } } // Returns offset of difference func matchLen(a, b []byte, max int) int { a = a[:max] b = b[:max] for i, av := range a { if b[i] != av { return i } } return max } func cmpb(a, b []byte) int { l := matchLen(a, b, len(a)) if l == len(a) { return -1 } return l } // Ensure that memmove writes pointers atomically, so the GC won't // observe a partially updated pointer. func TestMemmoveAtomicity(t *testing.T) { if race.Enabled { t.Skip("skip under the race detector -- this test is intentionally racy") } var x int for _, backward := range []bool{true, false} { for _, n := range []int{3, 4, 5, 6, 7, 8, 9, 10, 15, 25, 49} { n := n // test copying [N]*int. sz := uintptr(n * PtrSize) name := fmt.Sprint(sz) if backward { name += "-backward" } else { name += "-forward" } t.Run(name, func(t *testing.T) { // Use overlapping src and dst to force forward/backward copy. var s [100]*int src := s[n-1 : 2*n-1] dst := s[:n] if backward { src, dst = dst, src } for i := range src { src[i] = &x } for i := range dst { dst[i] = nil } var ready atomic.Uint32 go func() { sp := unsafe.Pointer(&src[0]) dp := unsafe.Pointer(&dst[0]) ready.Store(1) for i := 0; i < 10000; i++ { Memmove(dp, sp, sz) MemclrNoHeapPointers(dp, sz) } ready.Store(2) }() for ready.Load() == 0 { Gosched() } for ready.Load() != 2 { for i := range dst { p := dst[i] if p != nil && p != &x { t.Fatalf("got partially updated pointer %p at dst[%d], want either nil or %p", p, i, &x) } } } }) } } } func benchmarkSizes(b *testing.B, sizes []int, fn func(b *testing.B, n int)) { for _, n := range sizes { b.Run(fmt.Sprint(n), func(b *testing.B) { b.SetBytes(int64(n)) fn(b, n) }) } } var bufSizes = []int{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, } var bufSizesOverlap = []int{ 32, 64, 128, 256, 512, 1024, 2048, 4096, } func BenchmarkMemmove(b *testing.B) { benchmarkSizes(b, bufSizes, func(b *testing.B, n int) { x := make([]byte, n) y := make([]byte, n) for i := 0; i < b.N; i++ { copy(x, y) } }) } func BenchmarkMemmoveOverlap(b *testing.B) { benchmarkSizes(b, bufSizesOverlap, func(b *testing.B, n int) { x := make([]byte, n+16) for i := 0; i < b.N; i++ { copy(x[16:n+16], x[:n]) } }) } func BenchmarkMemmoveUnalignedDst(b *testing.B) { benchmarkSizes(b, bufSizes, func(b *testing.B, n int) { x := make([]byte, n+1) y := make([]byte, n) for i := 0; i < b.N; i++ { copy(x[1:], y) } }) } func BenchmarkMemmoveUnalignedDstOverlap(b *testing.B) { benchmarkSizes(b, bufSizesOverlap, func(b *testing.B, n int) { x := make([]byte, n+16) for i := 0; i < b.N; i++ { copy(x[16:n+16], x[1:n+1]) } }) } func BenchmarkMemmoveUnalignedSrc(b *testing.B) { benchmarkSizes(b, bufSizes, func(b *testing.B, n int) { x := make([]byte, n) y := make([]byte, n+1) for i := 0; i < b.N; i++ { copy(x, y[1:]) } }) } func BenchmarkMemmoveUnalignedSrcDst(b *testing.B) { for _, n := range []int{16, 64, 256, 4096, 65536} { buf := make([]byte, (n+8)*2) x := buf[:len(buf)/2] y := buf[len(buf)/2:] for _, off := range []int{0, 1, 4, 7} { b.Run(fmt.Sprint("f_", n, off), func(b *testing.B) { b.SetBytes(int64(n)) for i := 0; i < b.N; i++ { copy(x[off:n+off], y[off:n+off]) } }) b.Run(fmt.Sprint("b_", n, off), func(b *testing.B) { b.SetBytes(int64(n)) for i := 0; i < b.N; i++ { copy(y[off:n+off], x[off:n+off]) } }) } } } func BenchmarkMemmoveUnalignedSrcOverlap(b *testing.B) { benchmarkSizes(b, bufSizesOverlap, func(b *testing.B, n int) { x := make([]byte, n+1) for i := 0; i < b.N; i++ { copy(x[1:n+1], x[:n]) } }) } func TestMemclr(t *testing.T) { size := 512 if testing.Short() { size = 128 + 16 } mem := make([]byte, size) for i := 0; i < size; i++ { mem[i] = 0xee } for n := 0; n < size; n++ { for x := 0; x <= size-n; x++ { // offset in mem MemclrBytes(mem[x : x+n]) for i := 0; i < x; i++ { if mem[i] != 0xee { t.Fatalf("overwrite prefix mem[%d] = %d", i, mem[i]) } } for i := x; i < x+n; i++ { if mem[i] != 0 { t.Fatalf("failed clear mem[%d] = %d", i, mem[i]) } mem[i] = 0xee } for i := x + n; i < size; i++ { if mem[i] != 0xee { t.Fatalf("overwrite suffix mem[%d] = %d", i, mem[i]) } } } } } func BenchmarkMemclr(b *testing.B) { for _, n := range []int{5, 16, 64, 256, 4096, 65536} { x := make([]byte, n) b.Run(fmt.Sprint(n), func(b *testing.B) { b.SetBytes(int64(n)) for i := 0; i < b.N; i++ { MemclrBytes(x) } }) } for _, m := range []int{1, 4, 8, 16, 64} { x := make([]byte, m<<20) b.Run(fmt.Sprint(m, "M"), func(b *testing.B) { b.SetBytes(int64(m << 20)) for i := 0; i < b.N; i++ { MemclrBytes(x) } }) } } func BenchmarkMemclrUnaligned(b *testing.B) { for _, off := range []int{0, 1, 4, 7} { for _, n := range []int{5, 16, 64, 256, 4096, 65536} { x := make([]byte, n+off) b.Run(fmt.Sprint(off, n), func(b *testing.B) { b.SetBytes(int64(n)) for i := 0; i < b.N; i++ { MemclrBytes(x[off:]) } }) } } for _, off := range []int{0, 1, 4, 7} { for _, m := range []int{1, 4, 8, 16, 64} { x := make([]byte, (m<<20)+off) b.Run(fmt.Sprint(off, m, "M"), func(b *testing.B) { b.SetBytes(int64(m << 20)) for i := 0; i < b.N; i++ { MemclrBytes(x[off:]) } }) } } } func BenchmarkGoMemclr(b *testing.B) { benchmarkSizes(b, []int{5, 16, 64, 256}, func(b *testing.B, n int) { x := make([]byte, n) for i := 0; i < b.N; i++ { for j := range x { x[j] = 0 } } }) } func BenchmarkMemclrRange(b *testing.B) { type RunData struct { data []int } benchSizes := []RunData{ {[]int{1043, 1078, 1894, 1582, 1044, 1165, 1467, 1100, 1919, 1562, 1932, 1645, 1412, 1038, 1576, 1200, 1029, 1336, 1095, 1494, 1350, 1025, 1502, 1548, 1316, 1296, 1868, 1639, 1546, 1626, 1642, 1308, 1726, 1665, 1678, 1187, 1515, 1598, 1353, 1237, 1977, 1452, 2012, 1914, 1514, 1136, 1975, 1618, 1536, 1695, 1600, 1733, 1392, 1099, 1358, 1996, 1224, 1783, 1197, 1838, 1460, 1556, 1554, 2020}}, // 1kb-2kb {[]int{3964, 5139, 6573, 7775, 6553, 2413, 3466, 5394, 2469, 7336, 7091, 6745, 4028, 5643, 6164, 3475, 4138, 6908, 7559, 3335, 5660, 4122, 3945, 2082, 7564, 6584, 5111, 2288, 6789, 2797, 4928, 7986, 5163, 5447, 2999, 4968, 3174, 3202, 7908, 8137, 4735, 6161, 4646, 7592, 3083, 5329, 3687, 2754, 3599, 7231, 6455, 2549, 8063, 2189, 7121, 5048, 4277, 6626, 6306, 2815, 7473, 3963, 7549, 7255}}, // 2kb-8kb {[]int{16304, 15936, 15760, 4736, 9136, 11184, 10160, 5952, 14560, 15744, 6624, 5872, 13088, 14656, 14192, 10304, 4112, 10384, 9344, 4496, 11392, 7024, 5200, 10064, 14784, 5808, 13504, 10480, 8512, 4896, 13264, 5600}}, // 4kb-16kb {[]int{164576, 233136, 220224, 183280, 214112, 217248, 228560, 201728}}, // 128kb-256kb } for _, t := range benchSizes { total := 0 minLen := 0 maxLen := 0 for _, clrLen := range t.data { maxLen = max(maxLen, clrLen) if clrLen < minLen || minLen == 0 { minLen = clrLen } total += clrLen } buffer := make([]byte, maxLen) text := "" if minLen >= (1 << 20) { text = fmt.Sprint(minLen>>20, "M ", (maxLen+(1<<20-1))>>20, "M") } else if minLen >= (1 << 10) { text = fmt.Sprint(minLen>>10, "K ", (maxLen+(1<<10-1))>>10, "K") } else { text = fmt.Sprint(minLen, " ", maxLen) } b.Run(text, func(b *testing.B) { b.SetBytes(int64(total)) for i := 0; i < b.N; i++ { for _, clrLen := range t.data { MemclrBytes(buffer[:clrLen]) } } }) } } func BenchmarkClearFat7(b *testing.B) { p := new([7]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [7]byte{} } } func BenchmarkClearFat8(b *testing.B) { p := new([8 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [8 / 4]uint32{} } } func BenchmarkClearFat11(b *testing.B) { p := new([11]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [11]byte{} } } func BenchmarkClearFat12(b *testing.B) { p := new([12 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [12 / 4]uint32{} } } func BenchmarkClearFat13(b *testing.B) { p := new([13]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [13]byte{} } } func BenchmarkClearFat14(b *testing.B) { p := new([14]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [14]byte{} } } func BenchmarkClearFat15(b *testing.B) { p := new([15]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [15]byte{} } } func BenchmarkClearFat16(b *testing.B) { p := new([16 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [16 / 4]uint32{} } } func BenchmarkClearFat24(b *testing.B) { p := new([24 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [24 / 4]uint32{} } } func BenchmarkClearFat32(b *testing.B) { p := new([32 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [32 / 4]uint32{} } } func BenchmarkClearFat40(b *testing.B) { p := new([40 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [40 / 4]uint32{} } } func BenchmarkClearFat48(b *testing.B) { p := new([48 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [48 / 4]uint32{} } } func BenchmarkClearFat56(b *testing.B) { p := new([56 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [56 / 4]uint32{} } } func BenchmarkClearFat64(b *testing.B) { p := new([64 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [64 / 4]uint32{} } } func BenchmarkClearFat72(b *testing.B) { p := new([72 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [72 / 4]uint32{} } } func BenchmarkClearFat128(b *testing.B) { p := new([128 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [128 / 4]uint32{} } } func BenchmarkClearFat256(b *testing.B) { p := new([256 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [256 / 4]uint32{} } } func BenchmarkClearFat512(b *testing.B) { p := new([512 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [512 / 4]uint32{} } } func BenchmarkClearFat1024(b *testing.B) { p := new([1024 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [1024 / 4]uint32{} } } func BenchmarkClearFat1032(b *testing.B) { p := new([1032 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [1032 / 4]uint32{} } } func BenchmarkClearFat1040(b *testing.B) { p := new([1040 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = [1040 / 4]uint32{} } } func BenchmarkCopyFat7(b *testing.B) { var x [7]byte p := new([7]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat8(b *testing.B) { var x [8 / 4]uint32 p := new([8 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat11(b *testing.B) { var x [11]byte p := new([11]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat12(b *testing.B) { var x [12 / 4]uint32 p := new([12 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat13(b *testing.B) { var x [13]byte p := new([13]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat14(b *testing.B) { var x [14]byte p := new([14]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat15(b *testing.B) { var x [15]byte p := new([15]byte) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat16(b *testing.B) { var x [16 / 4]uint32 p := new([16 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat24(b *testing.B) { var x [24 / 4]uint32 p := new([24 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat32(b *testing.B) { var x [32 / 4]uint32 p := new([32 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat64(b *testing.B) { var x [64 / 4]uint32 p := new([64 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat72(b *testing.B) { var x [72 / 4]uint32 p := new([72 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat128(b *testing.B) { var x [128 / 4]uint32 p := new([128 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat256(b *testing.B) { var x [256 / 4]uint32 p := new([256 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat512(b *testing.B) { var x [512 / 4]uint32 p := new([512 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat520(b *testing.B) { var x [520 / 4]uint32 p := new([520 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat1024(b *testing.B) { var x [1024 / 4]uint32 p := new([1024 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat1032(b *testing.B) { var x [1032 / 4]uint32 p := new([1032 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } func BenchmarkCopyFat1040(b *testing.B) { var x [1040 / 4]uint32 p := new([1040 / 4]uint32) Escape(p) b.ResetTimer() for i := 0; i < b.N; i++ { *p = x } } // BenchmarkIssue18740 ensures that memmove uses 4 and 8 byte load/store to move 4 and 8 bytes. // It used to do 2 2-byte load/stores, which leads to a pipeline stall // when we try to read the result with one 4-byte load. func BenchmarkIssue18740(b *testing.B) { benchmarks := []struct { name string nbyte int f func([]byte) uint64 }{ {"2byte", 2, func(buf []byte) uint64 { return uint64(binary.LittleEndian.Uint16(buf)) }}, {"4byte", 4, func(buf []byte) uint64 { return uint64(binary.LittleEndian.Uint32(buf)) }}, {"8byte", 8, func(buf []byte) uint64 { return binary.LittleEndian.Uint64(buf) }}, } var g [4096]byte for _, bm := range benchmarks { buf := make([]byte, bm.nbyte) b.Run(bm.name, func(b *testing.B) { for j := 0; j < b.N; j++ { for i := 0; i < 4096; i += bm.nbyte { copy(buf[:], g[i:]) sink += bm.f(buf[:]) } } }) } } var memclrSink []int8 func BenchmarkMemclrKnownSize1(b *testing.B) { var x [1]int8 b.SetBytes(1) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize2(b *testing.B) { var x [2]int8 b.SetBytes(2) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize4(b *testing.B) { var x [4]int8 b.SetBytes(4) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize8(b *testing.B) { var x [8]int8 b.SetBytes(8) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize16(b *testing.B) { var x [16]int8 b.SetBytes(16) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize32(b *testing.B) { var x [32]int8 b.SetBytes(32) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize64(b *testing.B) { var x [64]int8 b.SetBytes(64) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize112(b *testing.B) { var x [112]int8 b.SetBytes(112) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize128(b *testing.B) { var x [128]int8 b.SetBytes(128) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize192(b *testing.B) { var x [192]int8 b.SetBytes(192) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize248(b *testing.B) { var x [248]int8 b.SetBytes(248) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize256(b *testing.B) { var x [256]int8 b.SetBytes(256) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize512(b *testing.B) { var x [512]int8 b.SetBytes(512) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize1024(b *testing.B) { var x [1024]int8 b.SetBytes(1024) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize4096(b *testing.B) { var x [4096]int8 b.SetBytes(4096) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] } func BenchmarkMemclrKnownSize512KiB(b *testing.B) { var x [524288]int8 b.SetBytes(524288) for i := 0; i < b.N; i++ { for a := range x { x[a] = 0 } } memclrSink = x[:] }
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