/
floats.go
167 lines (138 loc) · 3.41 KB
/
floats.go
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// asmcheck
// Copyright 2018 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 codegen
import "math"
// This file contains codegen tests related to arithmetic
// simplifications and optimizations on float types.
// For codegen tests on integer types, see arithmetic.go.
// --------------------- //
// Strength-reduce //
// --------------------- //
func Mul2(f float64) float64 {
// 386/sse2:"ADDSD",-"MULSD"
// 386/387:"FADDDP",-"FMULDP"
// amd64:"ADDSD",-"MULSD"
// arm/7:"ADDD",-"MULD"
// arm64:"FADDD",-"FMULD"
// ppc64:"FADD",-"FMUL"
// ppc64le:"FADD",-"FMUL"
return f * 2.0
}
func DivPow2(f1, f2, f3 float64) (float64, float64, float64) {
// 386/sse2:"MULSD",-"DIVSD"
// 386/387:"FMULDP",-"FDIVDP"
// amd64:"MULSD",-"DIVSD"
// arm/7:"MULD",-"DIVD"
// arm64:"FMULD",-"FDIVD"
// ppc64:"FMUL",-"FDIV"
// ppc64le:"FMUL",-"FDIV"
x := f1 / 16.0
// 386/sse2:"MULSD",-"DIVSD"
// 386/387:"FMULDP",-"FDIVDP"
// amd64:"MULSD",-"DIVSD"
// arm/7:"MULD",-"DIVD"
// arm64:"FMULD",-"FDIVD"
// ppc64:"FMUL",-"FDIVD"
// ppc64le:"FMUL",-"FDIVD"
y := f2 / 0.125
// 386/sse2:"ADDSD",-"DIVSD",-"MULSD"
// 386/387:"FADDDP",-"FDIVDP",-"FMULDP"
// amd64:"ADDSD",-"DIVSD",-"MULSD"
// arm/7:"ADDD",-"MULD",-"DIVD"
// arm64:"FADDD",-"FMULD",-"FDIVD"
// ppc64:"FADD",-"FMUL",-"FDIV"
// ppc64le:"FADD",-"FMUL",-"FDIV"
z := f3 / 0.5
return x, y, z
}
func getPi() float64 {
// 386/387:"FLDPI"
return math.Pi
}
func indexLoad(b0 []float32, b1 float32, idx int) float32 {
// arm64:`FMOVS\s\(R[0-9]+\)\(R[0-9]+\),\sF[0-9]+`
return b0[idx] * b1
}
func indexStore(b0 []float64, b1 float64, idx int) {
// arm64:`FMOVD\sF[0-9]+,\s\(R[0-9]+\)\(R[0-9]+\)`
b0[idx] = b1
}
// ----------- //
// Fused //
// ----------- //
func FusedAdd32(x, y, z float32) float32 {
// s390x:"FMADDS\t"
// ppc64:"FMADDS\t"
// ppc64le:"FMADDS\t"
// arm64:"FMADDS"
return x*y + z
}
func FusedSub32_a(x, y, z float32) float32 {
// s390x:"FMSUBS\t"
// ppc64:"FMSUBS\t"
// ppc64le:"FMSUBS\t"
return x*y - z
}
func FusedSub32_b(x, y, z float32) float32 {
// arm64:"FMSUBS"
return z - x*y
}
func FusedAdd64(x, y, z float64) float64 {
// s390x:"FMADD\t"
// ppc64:"FMADD\t"
// ppc64le:"FMADD\t"
// arm64:"FMADDD"
return x*y + z
}
func FusedSub64_a(x, y, z float64) float64 {
// s390x:"FMSUB\t"
// ppc64:"FMSUB\t"
// ppc64le:"FMSUB\t"
return x*y - z
}
func FusedSub64_b(x, y, z float64) float64 {
// arm64:"FMSUBD"
return z - x*y
}
func Cmp(f float64) bool {
// arm64:"FCMPD","(BGT|BLE|BMI|BPL)",-"CSET\tGT",-"CBZ"
return f > 4 || f < -4
}
func CmpZero64(f float64) bool {
// s390x:"LTDBR",-"FCMPU"
return f <= 0
}
func CmpZero32(f float32) bool {
// s390x:"LTEBR",-"CEBR"
return f <= 0
}
func CmpWithSub(a float64, b float64) bool {
f := a - b
// s390x:-"LTDBR"
return f <= 0
}
func CmpWithAdd(a float64, b float64) bool {
f := a + b
// s390x:-"LTDBR"
return f <= 0
}
// ---------------- //
// Non-floats //
// ---------------- //
// We should make sure that the compiler doesn't generate floating point
// instructions for non-float operations on Plan 9, because floating point
// operations are not allowed in the note handler.
func ArrayZero() [16]byte {
// amd64:"MOVUPS"
// plan9/amd64/:-"MOVUPS"
var a [16]byte
return a
}
func ArrayCopy(a [16]byte) (b [16]byte) {
// amd64:"MOVUPS"
// plan9/amd64/:-"MOVUPS"
b = a
return
}