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Code Editor : fuse_test.go
package ssa import ( "cmd/compile/internal/types" "fmt" "strconv" "testing" ) func TestFuseEliminatesOneBranch(t *testing.T) { c := testConfig(t) ptrType := c.config.Types.BytePtr fun := c.Fun("entry", Bloc("entry", Valu("mem", OpInitMem, types.TypeMem, 0, nil), Valu("sb", OpSB, c.config.Types.Uintptr, 0, nil), Goto("checkPtr")), Bloc("checkPtr", Valu("ptr1", OpLoad, ptrType, 0, nil, "sb", "mem"), Valu("nilptr", OpConstNil, ptrType, 0, nil), Valu("bool1", OpNeqPtr, c.config.Types.Bool, 0, nil, "ptr1", "nilptr"), If("bool1", "then", "exit")), Bloc("then", Goto("exit")), Bloc("exit", Exit("mem"))) CheckFunc(fun.f) fuseAll(fun.f) for _, b := range fun.f.Blocks { if b == fun.blocks["then"] && b.Kind != BlockInvalid { t.Errorf("then was not eliminated, but should have") } } } func TestFuseEliminatesBothBranches(t *testing.T) { c := testConfig(t) ptrType := c.config.Types.BytePtr fun := c.Fun("entry", Bloc("entry", Valu("mem", OpInitMem, types.TypeMem, 0, nil), Valu("sb", OpSB, c.config.Types.Uintptr, 0, nil), Goto("checkPtr")), Bloc("checkPtr", Valu("ptr1", OpLoad, ptrType, 0, nil, "sb", "mem"), Valu("nilptr", OpConstNil, ptrType, 0, nil), Valu("bool1", OpNeqPtr, c.config.Types.Bool, 0, nil, "ptr1", "nilptr"), If("bool1", "then", "else")), Bloc("then", Goto("exit")), Bloc("else", Goto("exit")), Bloc("exit", Exit("mem"))) CheckFunc(fun.f) fuseAll(fun.f) for _, b := range fun.f.Blocks { if b == fun.blocks["then"] && b.Kind != BlockInvalid { t.Errorf("then was not eliminated, but should have") } if b == fun.blocks["else"] && b.Kind != BlockInvalid { t.Errorf("else was not eliminated, but should have") } } } func TestFuseHandlesPhis(t *testing.T) { c := testConfig(t) ptrType := c.config.Types.BytePtr fun := c.Fun("entry", Bloc("entry", Valu("mem", OpInitMem, types.TypeMem, 0, nil), Valu("sb", OpSB, c.config.Types.Uintptr, 0, nil), Goto("checkPtr")), Bloc("checkPtr", Valu("ptr1", OpLoad, ptrType, 0, nil, "sb", "mem"), Valu("nilptr", OpConstNil, ptrType, 0, nil), Valu("bool1", OpNeqPtr, c.config.Types.Bool, 0, nil, "ptr1", "nilptr"), If("bool1", "then", "else")), Bloc("then", Goto("exit")), Bloc("else", Goto("exit")), Bloc("exit", Valu("phi", OpPhi, ptrType, 0, nil, "ptr1", "ptr1"), Exit("mem"))) CheckFunc(fun.f) fuseAll(fun.f) for _, b := range fun.f.Blocks { if b == fun.blocks["then"] && b.Kind != BlockInvalid { t.Errorf("then was not eliminated, but should have") } if b == fun.blocks["else"] && b.Kind != BlockInvalid { t.Errorf("else was not eliminated, but should have") } } } func TestFuseEliminatesEmptyBlocks(t *testing.T) { c := testConfig(t) fun := c.Fun("entry", Bloc("entry", Valu("mem", OpInitMem, types.TypeMem, 0, nil), Valu("sb", OpSB, c.config.Types.Uintptr, 0, nil), Goto("z0")), Bloc("z1", Goto("z2")), Bloc("z3", Goto("exit")), Bloc("z2", Goto("z3")), Bloc("z0", Goto("z1")), Bloc("exit", Exit("mem"), )) CheckFunc(fun.f) fuseAll(fun.f) for k, b := range fun.blocks { if k[:1] == "z" && b.Kind != BlockInvalid { t.Errorf("%s was not eliminated, but should have", k) } } } func TestFuseSideEffects(t *testing.T) { // Test that we don't fuse branches that have side effects but // have no use (e.g. followed by infinite loop). // See issue #36005. c := testConfig(t) fun := c.Fun("entry", Bloc("entry", Valu("mem", OpInitMem, types.TypeMem, 0, nil), Valu("b", OpArg, c.config.Types.Bool, 0, nil), If("b", "then", "else")), Bloc("then", Valu("call1", OpStaticCall, types.TypeMem, 0, nil, "mem"), Goto("empty")), Bloc("else", Valu("call2", OpStaticCall, types.TypeMem, 0, nil, "mem"), Goto("empty")), Bloc("empty", Goto("loop")), Bloc("loop", Goto("loop"))) CheckFunc(fun.f) fuseAll(fun.f) for _, b := range fun.f.Blocks { if b == fun.blocks["then"] && b.Kind == BlockInvalid { t.Errorf("then is eliminated, but should not") } if b == fun.blocks["else"] && b.Kind == BlockInvalid { t.Errorf("else is eliminated, but should not") } } } func BenchmarkFuse(b *testing.B) { for _, n := range [...]int{1, 10, 100, 1000, 10000} { b.Run(strconv.Itoa(n), func(b *testing.B) { c := testConfig(b) blocks := make([]bloc, 0, 2*n+3) blocks = append(blocks, Bloc("entry", Valu("mem", OpInitMem, types.TypeMem, 0, nil), Valu("cond", OpArg, c.config.Types.Bool, 0, nil), Valu("x", OpArg, c.config.Types.Int64, 0, nil), Goto("exit"))) phiArgs := make([]string, 0, 2*n) for i := 0; i < n; i++ { cname := fmt.Sprintf("c%d", i) blocks = append(blocks, Bloc(fmt.Sprintf("b%d", i), If("cond", cname, "merge")), Bloc(cname, Goto("merge"))) phiArgs = append(phiArgs, "x", "x") } blocks = append(blocks, Bloc("merge", Valu("phi", OpPhi, types.TypeMem, 0, nil, phiArgs...), Goto("exit")), Bloc("exit", Exit("mem"))) b.ResetTimer() for i := 0; i < b.N; i++ { fun := c.Fun("entry", blocks...) fuseAll(fun.f) } }) } }
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