floats.go

// 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

// 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"
	// amd64:"ADDSD",-"MULSD"
	// arm/7:"ADDD",-"MULD"
	// arm64:"FADDD",-"FMULD"
	// ppc64x:"FADD",-"FMUL"
	// riscv64:"FADDD",-"FMULD"
	return f * 2.0
}

func DivPow2(f1, f2, f3 float64) (float64, float64, float64) {
	// 386/sse2:"MULSD",-"DIVSD"
	// amd64:"MULSD",-"DIVSD"
	// arm/7:"MULD",-"DIVD"
	// arm64:"FMULD",-"FDIVD"
	// ppc64x:"FMUL",-"FDIV"
	// riscv64:"FMULD",-"FDIVD"
	x := f1 / 16.0

	// 386/sse2:"MULSD",-"DIVSD"
	// amd64:"MULSD",-"DIVSD"
	// arm/7:"MULD",-"DIVD"
	// arm64:"FMULD",-"FDIVD"
	// ppc64x:"FMUL",-"FDIVD"
	// riscv64:"FMULD",-"FDIVD"
	y := f2 / 0.125

	// 386/sse2:"ADDSD",-"DIVSD",-"MULSD"
	// amd64:"ADDSD",-"DIVSD",-"MULSD"
	// arm/7:"ADDD",-"MULD",-"DIVD"
	// arm64:"FADDD",-"FMULD",-"FDIVD"
	// ppc64x:"FADD",-"FMUL",-"FDIV"
	// riscv64:"FADDD",-"FMULD",-"FDIVD"
	z := f3 / 0.5

	return x, y, z
}

func indexLoad(b0 []float32, b1 float32, idx int) float32 {
	// arm64:`FMOVS\s\(R[0-9]+\)\(R[0-9]+<<2\),\sF[0-9]+`
	// loong64:`MOVF\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\(R[0-9]+\)\(R[0-9]+<<3\)`
	// loong64:`MOVD\sF[0-9]+,\s\(R[0-9]+\)\(R[0-9]+\)`
	b0[idx] = b1
}

// ----------- //
//    Fused    //
// ----------- //

func FusedAdd32(x, y, z float32) float32 {
	// s390x:"FMADDS\t"
	// ppc64x:"FMADDS\t"
	// arm64:"FMADDS"
	// loong64:"FMADDF\t"
	// riscv64:"FMADDS\t"
	return x*y + z
}

func FusedSub32_a(x, y, z float32) float32 {
	// s390x:"FMSUBS\t"
	// ppc64x:"FMSUBS\t"
	// riscv64:"FMSUBS\t"
	// loong64:"FMSUBF\t"
	return x*y - z
}

func FusedSub32_b(x, y, z float32) float32 {
	// arm64:"FMSUBS"
	// loong64:"FNMSUBF\t"
	// riscv64:"FNMSUBS\t"
	return z - x*y
}

func FusedAdd64(x, y, z float64) float64 {
	// s390x:"FMADD\t"
	// ppc64x:"FMADD\t"
	// arm64:"FMADDD"
	// loong64:"FMADDD\t"
	// riscv64:"FMADDD\t"
	return x*y + z
}

func FusedSub64_a(x, y, z float64) float64 {
	// s390x:"FMSUB\t"
	// ppc64x:"FMSUB\t"
	// riscv64:"FMSUBD\t"
	// loong64:"FMSUBD\t"
	return x*y - z
}

func FusedSub64_b(x, y, z float64) float64 {
	// arm64:"FMSUBD"
	// loong64:"FNMSUBD\t"
	// riscv64:"FNMSUBD\t"
	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
}

// ---------------- //
//  Float Min/Max   //
// ---------------- //

func Float64Min(a, b float64) float64 {
	// amd64:"MINSD"
	// arm64:"FMIND"
	// loong64:"FMIND"
	// riscv64:"FMIN"
	// ppc64/power9:"XSMINJDP"
	// ppc64/power10:"XSMINJDP"
	return min(a, b)
}

func Float64Max(a, b float64) float64 {
	// amd64:"MINSD"
	// arm64:"FMAXD"
	// loong64:"FMAXD"
	// riscv64:"FMAX"
	// ppc64/power9:"XSMAXJDP"
	// ppc64/power10:"XSMAXJDP"
	return max(a, b)
}

func Float32Min(a, b float32) float32 {
	// amd64:"MINSS"
	// arm64:"FMINS"
	// loong64:"FMINF"
	// riscv64:"FMINS"
	// ppc64/power9:"XSMINJDP"
	// ppc64/power10:"XSMINJDP"
	return min(a, b)
}

func Float32Max(a, b float32) float32 {
	// amd64:"MINSS"
	// arm64:"FMAXS"
	// loong64:"FMAXF"
	// riscv64:"FMAXS"
	// ppc64/power9:"XSMAXJDP"
	// ppc64/power10:"XSMAXJDP"
	return max(a, b)
}

// ------------------------ //
//  Constant Optimizations  //
// ------------------------ //

func Float32Constant() float32 {
	// ppc64x/power8:"FMOVS\t[$]f32\\.42440000\\(SB\\)"
	// ppc64x/power9:"FMOVS\t[$]f32\\.42440000\\(SB\\)"
	// ppc64x/power10:"XXSPLTIDP\t[$]1111752704,"
	return 49.0
}

func Float64Constant() float64 {
	// ppc64x/power8:"FMOVD\t[$]f64\\.4048800000000000\\(SB\\)"
	// ppc64x/power9:"FMOVD\t[$]f64\\.4048800000000000\\(SB\\)"
	// ppc64x/power10:"XXSPLTIDP\t[$]1111752704,"
	return 49.0
}

func Float32DenormalConstant() float32 {
	// ppc64x:"FMOVS\t[$]f32\\.00400000\\(SB\\)"
	return 0x1p-127
}

// A float64 constant which can be exactly represented as a
// denormal float32 value. On ppc64x, denormal values cannot
// be used with XXSPLTIDP.
func Float64DenormalFloat32Constant() float64 {
	// ppc64x:"FMOVD\t[$]f64\\.3800000000000000\\(SB\\)"
	return 0x1p-127
}

func Float64ConstantStore(p *float64) {
	// amd64: "MOVQ\t[$]4617801906721357038"
	*p = 5.432
}
func Float32ConstantStore(p *float32) {
	// amd64: "MOVL\t[$]1085133554"
	*p = 5.432
}