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// 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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