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Code Editor : 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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