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opt / golang / 1.19.4 / src / cmd / compile / internal / ssa /

📁 ..
📄 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: deadcode_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"
	"fmt"
	"strconv"
	"testing"
)

func TestDeadLoop(t *testing.T) {
	c := testConfig(t)
	fun := c.Fun("entry",
		Bloc("entry",
			Valu("mem", OpInitMem, types.TypeMem, 0, nil),
			Goto("exit")),
		Bloc("exit",
			Exit("mem")),
		// dead loop
		Bloc("deadblock",
			// dead value in dead block
			Valu("deadval", OpConstBool, c.config.Types.Bool, 1, nil),
			If("deadval", "deadblock", "exit")))

CheckFunc(fun.f)
	Deadcode(fun.f)
	CheckFunc(fun.f)

for _, b := range fun.f.Blocks {
		if b == fun.blocks["deadblock"] {
			t.Errorf("dead block not removed")
		}
		for _, v := range b.Values {
			if v == fun.values["deadval"] {
				t.Errorf("control value of dead block not removed")
			}
		}
	}
}

func TestDeadValue(t *testing.T) {
	c := testConfig(t)
	fun := c.Fun("entry",
		Bloc("entry",
			Valu("mem", OpInitMem, types.TypeMem, 0, nil),
			Valu("deadval", OpConst64, c.config.Types.Int64, 37, nil),
			Goto("exit")),
		Bloc("exit",
			Exit("mem")))

CheckFunc(fun.f)
	Deadcode(fun.f)
	CheckFunc(fun.f)

for _, b := range fun.f.Blocks {
		for _, v := range b.Values {
			if v == fun.values["deadval"] {
				t.Errorf("dead value not removed")
			}
		}
	}
}

func TestNeverTaken(t *testing.T) {
	c := testConfig(t)
	fun := c.Fun("entry",
		Bloc("entry",
			Valu("cond", OpConstBool, c.config.Types.Bool, 0, nil),
			Valu("mem", OpInitMem, types.TypeMem, 0, nil),
			If("cond", "then", "else")),
		Bloc("then",
			Goto("exit")),
		Bloc("else",
			Goto("exit")),
		Bloc("exit",
			Exit("mem")))

CheckFunc(fun.f)
	Opt(fun.f)
	Deadcode(fun.f)
	CheckFunc(fun.f)

if fun.blocks["entry"].Kind != BlockPlain {
		t.Errorf("if(false) not simplified")
	}
	for _, b := range fun.f.Blocks {
		if b == fun.blocks["then"] {
			t.Errorf("then block still present")
		}
		for _, v := range b.Values {
			if v == fun.values["cond"] {
				t.Errorf("constant condition still present")
			}
		}
	}

}

func TestNestedDeadBlocks(t *testing.T) {
	c := testConfig(t)
	fun := c.Fun("entry",
		Bloc("entry",
			Valu("mem", OpInitMem, types.TypeMem, 0, nil),
			Valu("cond", OpConstBool, c.config.Types.Bool, 0, nil),
			If("cond", "b2", "b4")),
		Bloc("b2",
			If("cond", "b3", "b4")),
		Bloc("b3",
			If("cond", "b3", "b4")),
		Bloc("b4",
			If("cond", "b3", "exit")),
		Bloc("exit",
			Exit("mem")))

CheckFunc(fun.f)
	Opt(fun.f)
	CheckFunc(fun.f)
	Deadcode(fun.f)
	CheckFunc(fun.f)
	if fun.blocks["entry"].Kind != BlockPlain {
		t.Errorf("if(false) not simplified")
	}
	for _, b := range fun.f.Blocks {
		if b == fun.blocks["b2"] {
			t.Errorf("b2 block still present")
		}
		if b == fun.blocks["b3"] {
			t.Errorf("b3 block still present")
		}
		for _, v := range b.Values {
			if v == fun.values["cond"] {
				t.Errorf("constant condition still present")
			}
		}
	}
}

func BenchmarkDeadCode(b *testing.B) {
	for _, n := range [...]int{1, 10, 100, 1000, 10000, 100000, 200000} {
		b.Run(strconv.Itoa(n), func(b *testing.B) {
			c := testConfig(b)
			blocks := make([]bloc, 0, n+2)
			blocks = append(blocks,
				Bloc("entry",
					Valu("mem", OpInitMem, types.TypeMem, 0, nil),
					Goto("exit")))
			blocks = append(blocks, Bloc("exit", Exit("mem")))
			for i := 0; i < n; i++ {
				blocks = append(blocks, Bloc(fmt.Sprintf("dead%d", i), Goto("exit")))
			}
			b.ResetTimer()
			for i := 0; i < b.N; i++ {
				fun := c.Fun("entry", blocks...)
				Deadcode(fun.f)
			}
		})
	}
}

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Editing: deadcode_test.go

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