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📁 ..
📄 README.md(8.14 KB)
📄 TODO(950 B)
📄 addressingmodes.go(23.64 KB)
📄 bench_test.go(531 B)
📄 biasedsparsemap.go(2.71 KB)
📄 block.go(11.1 KB)
📄 branchelim.go(11.98 KB)
📄 branchelim_test.go(5.21 KB)
📄 cache.go(2.46 KB)
📄 check.go(16.59 KB)
📄 checkbce.go(956 B)
📄 compile.go(18.19 KB)
📄 config.go(11.7 KB)
📄 copyelim.go(1.83 KB)
📄 copyelim_test.go(1.29 KB)
📄 critical.go(3.19 KB)
📄 cse.go(9.43 KB)
📄 cse_test.go(4.25 KB)
📄 deadcode.go(9.61 KB)
📄 deadcode_test.go(3.49 KB)
📄 deadstore.go(9.08 KB)
📄 deadstore_test.go(4.09 KB)
📄 debug.go(56.34 KB)
📄 debug_lines_test.go(8.29 KB)
📄 debug_test.go(28.75 KB)
📄 decompose.go(13.41 KB)
📄 dom.go(7.98 KB)
📄 dom_test.go(13.34 KB)
📄 expand_calls.go(63.5 KB)
📄 export_test.go(3.23 KB)
📄 flagalloc.go(6.68 KB)
📄 flags_amd64_test.s(533 B)
📄 flags_arm64_test.s(699 B)
📄 flags_test.go(2.49 KB)
📄 func.go(27.08 KB)
📄 func_test.go(13.07 KB)
📄 fuse.go(6.5 KB)
📄 fuse_branchredirect.go(3.24 KB)
📄 fuse_comparisons.go(4.04 KB)
📄 fuse_test.go(7.21 KB)
📁 gen
📄 html.go(34.72 KB)
📄 id.go(576 B)
📄 layout.go(4.82 KB)
📄 lca.go(3.77 KB)
📄 lca_test.go(1.65 KB)
📄 likelyadjust.go(15.24 KB)
📄 location.go(3.06 KB)
📄 loopbce.go(10.54 KB)
📄 loopreschedchecks.go(15.86 KB)
📄 looprotate.go(2.61 KB)
📄 lower.go(1.36 KB)
📄 magic.go(15.77 KB)
📄 magic_test.go(9.1 KB)
📄 nilcheck.go(11.06 KB)
📄 nilcheck_test.go(12.17 KB)
📄 numberlines.go(7.83 KB)
📄 op.go(18.65 KB)
📄 opGen.go(1.01 MB)
📄 opt.go(308 B)
📄 passbm_test.go(3.14 KB)
📄 phielim.go(1.48 KB)
📄 phiopt.go(8.08 KB)
📄 poset.go(37.2 KB)
📄 poset_test.go(18.14 KB)
📄 print.go(3.85 KB)
📄 prove.go(41.82 KB)
📄 regalloc.go(83.69 KB)
📄 regalloc_test.go(6.49 KB)
📄 rewrite.go(53.49 KB)
📄 rewrite386.go(289.01 KB)
📄 rewrite386splitload.go(4.05 KB)
📄 rewriteAMD64.go(888.95 KB)
📄 rewriteAMD64splitload.go(21.41 KB)
📄 rewriteARM.go(487.7 KB)
📄 rewriteARM64.go(751.84 KB)
📄 rewriteCond_test.go(10.62 KB)
📄 rewriteLOONG64.go(193.44 KB)
📄 rewriteMIPS.go(174.44 KB)
📄 rewriteMIPS64.go(195.55 KB)
📄 rewritePPC64.go(431.6 KB)
📄 rewriteRISCV64.go(159.66 KB)
📄 rewriteS390X.go(433.4 KB)
📄 rewriteWasm.go(109.86 KB)
📄 rewrite_test.go(6.91 KB)
📄 rewritedec.go(10.16 KB)
📄 rewritedec64.go(63.77 KB)
📄 rewritegeneric.go(617.96 KB)
📄 schedule.go(18.23 KB)
📄 schedule_test.go(2.91 KB)
📄 shift_test.go(4.05 KB)
📄 shortcircuit.go(12.63 KB)
📄 shortcircuit_test.go(1.31 KB)
📄 sizeof_test.go(855 B)
📄 softfloat.go(1.99 KB)
📄 sparsemap.go(1.98 KB)
📄 sparseset.go(1.54 KB)
📄 sparsetree.go(8.05 KB)
📄 stackalloc.go(12.79 KB)
📄 stackframe.go(290 B)
📄 stmtlines_test.go(2.96 KB)
📁 testdata
📄 tighten.go(4.3 KB)
📄 trim.go(4.24 KB)
📄 tuple.go(1.97 KB)
📄 value.go(15.21 KB)
📄 writebarrier.go(19.29 KB)
📄 writebarrier_test.go(1.75 KB)
📄 xposmap.go(3.29 KB)
📄 zcse.go(2.07 KB)
📄 zeroextension_test.go(1.66 KB)

Editing: shift_test.go

// Copyright 2015 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 ssa

import (
	"cmd/compile/internal/types"
	"testing"
)

func TestShiftConstAMD64(t *testing.T) {
	c := testConfig(t)
	fun := makeConstShiftFunc(c, 18, OpLsh64x64, c.config.Types.UInt64)
	checkOpcodeCounts(t, fun.f, map[Op]int{OpAMD64SHLQconst: 1, OpAMD64CMPQconst: 0, OpAMD64ANDQconst: 0})

fun = makeConstShiftFunc(c, 66, OpLsh64x64, c.config.Types.UInt64)
	checkOpcodeCounts(t, fun.f, map[Op]int{OpAMD64SHLQconst: 0, OpAMD64CMPQconst: 0, OpAMD64ANDQconst: 0})

fun = makeConstShiftFunc(c, 18, OpRsh64Ux64, c.config.Types.UInt64)
	checkOpcodeCounts(t, fun.f, map[Op]int{OpAMD64SHRQconst: 1, OpAMD64CMPQconst: 0, OpAMD64ANDQconst: 0})

fun = makeConstShiftFunc(c, 66, OpRsh64Ux64, c.config.Types.UInt64)
	checkOpcodeCounts(t, fun.f, map[Op]int{OpAMD64SHRQconst: 0, OpAMD64CMPQconst: 0, OpAMD64ANDQconst: 0})

fun = makeConstShiftFunc(c, 18, OpRsh64x64, c.config.Types.Int64)
	checkOpcodeCounts(t, fun.f, map[Op]int{OpAMD64SARQconst: 1, OpAMD64CMPQconst: 0})

fun = makeConstShiftFunc(c, 66, OpRsh64x64, c.config.Types.Int64)
	checkOpcodeCounts(t, fun.f, map[Op]int{OpAMD64SARQconst: 1, OpAMD64CMPQconst: 0})
}

func makeConstShiftFunc(c *Conf, amount int64, op Op, typ *types.Type) fun {
	ptyp := c.config.Types.BytePtr
	fun := c.Fun("entry",
		Bloc("entry",
			Valu("mem", OpInitMem, types.TypeMem, 0, nil),
			Valu("SP", OpSP, c.config.Types.Uintptr, 0, nil),
			Valu("argptr", OpOffPtr, ptyp, 8, nil, "SP"),
			Valu("resptr", OpOffPtr, ptyp, 16, nil, "SP"),
			Valu("load", OpLoad, typ, 0, nil, "argptr", "mem"),
			Valu("c", OpConst64, c.config.Types.UInt64, amount, nil),
			Valu("shift", op, typ, 0, nil, "load", "c"),
			Valu("store", OpStore, types.TypeMem, 0, c.config.Types.UInt64, "resptr", "shift", "mem"),
			Exit("store")))
	Compile(fun.f)
	return fun
}

func TestShiftToExtensionAMD64(t *testing.T) {
	c := testConfig(t)
	// Test that eligible pairs of constant shifts are converted to extensions.
	// For example:
	//   (uint64(x) << 32) >> 32 -> uint64(uint32(x))
	ops := map[Op]int{
		OpAMD64SHLQconst: 0, OpAMD64SHLLconst: 0,
		OpAMD64SHRQconst: 0, OpAMD64SHRLconst: 0,
		OpAMD64SARQconst: 0, OpAMD64SARLconst: 0,
	}
	tests := [...]struct {
		amount      int64
		left, right Op
		typ         *types.Type
	}{
		// unsigned
		{56, OpLsh64x64, OpRsh64Ux64, c.config.Types.UInt64},
		{48, OpLsh64x64, OpRsh64Ux64, c.config.Types.UInt64},
		{32, OpLsh64x64, OpRsh64Ux64, c.config.Types.UInt64},
		{24, OpLsh32x64, OpRsh32Ux64, c.config.Types.UInt32},
		{16, OpLsh32x64, OpRsh32Ux64, c.config.Types.UInt32},
		{8, OpLsh16x64, OpRsh16Ux64, c.config.Types.UInt16},
		// signed
		{56, OpLsh64x64, OpRsh64x64, c.config.Types.Int64},
		{48, OpLsh64x64, OpRsh64x64, c.config.Types.Int64},
		{32, OpLsh64x64, OpRsh64x64, c.config.Types.Int64},
		{24, OpLsh32x64, OpRsh32x64, c.config.Types.Int32},
		{16, OpLsh32x64, OpRsh32x64, c.config.Types.Int32},
		{8, OpLsh16x64, OpRsh16x64, c.config.Types.Int16},
	}
	for _, tc := range tests {
		fun := makeShiftExtensionFunc(c, tc.amount, tc.left, tc.right, tc.typ)
		checkOpcodeCounts(t, fun.f, ops)
	}
}

// makeShiftExtensionFunc generates a function containing:
//
//	(rshift (lshift (Const64 [amount])) (Const64 [amount]))
//
// This may be equivalent to a sign or zero extension.
func makeShiftExtensionFunc(c *Conf, amount int64, lshift, rshift Op, typ *types.Type) fun {
	ptyp := c.config.Types.BytePtr
	fun := c.Fun("entry",
		Bloc("entry",
			Valu("mem", OpInitMem, types.TypeMem, 0, nil),
			Valu("SP", OpSP, c.config.Types.Uintptr, 0, nil),
			Valu("argptr", OpOffPtr, ptyp, 8, nil, "SP"),
			Valu("resptr", OpOffPtr, ptyp, 16, nil, "SP"),
			Valu("load", OpLoad, typ, 0, nil, "argptr", "mem"),
			Valu("c", OpConst64, c.config.Types.UInt64, amount, nil),
			Valu("lshift", lshift, typ, 0, nil, "load", "c"),
			Valu("rshift", rshift, typ, 0, nil, "lshift", "c"),
			Valu("store", OpStore, types.TypeMem, 0, c.config.Types.UInt64, "resptr", "rshift", "mem"),
			Exit("store")))
	Compile(fun.f)
	return fun
}

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Editing: shift_test.go

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