test/codegen/math.go - go - Git at Google

 // 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"

 var sink64 [8]float64

 func approx(x float64) {
 	// amd64/v2:-".*x86HasSSE41" amd64/v3:-".*x86HasSSE41"
 	// amd64:"ROUNDSD\t[$]2"
 	// s390x:"FIDBR\t[$]6"
 	// arm64:"FRINTPD"
 	// ppc64x:"FRIP"
 	// wasm:"F64Ceil"
 	sink64[0] = math.Ceil(x)

 	// amd64/v2:-".*x86HasSSE41" amd64/v3:-".*x86HasSSE41"
 	// amd64:"ROUNDSD\t[$]1"
 	// s390x:"FIDBR\t[$]7"
 	// arm64:"FRINTMD"
 	// ppc64x:"FRIM"
 	// wasm:"F64Floor"
 	sink64[1] = math.Floor(x)

 	// s390x:"FIDBR\t[$]1"
 	// arm64:"FRINTAD"
 	// ppc64x:"FRIN"
 	sink64[2] = math.Round(x)

 	// amd64/v2:-".*x86HasSSE41" amd64/v3:-".*x86HasSSE41"
 	// amd64:"ROUNDSD\t[$]3"
 	// s390x:"FIDBR\t[$]5"
 	// arm64:"FRINTZD"
 	// ppc64x:"FRIZ"
 	// wasm:"F64Trunc"
 	sink64[3] = math.Trunc(x)

 	// amd64/v2:-".*x86HasSSE41" amd64/v3:-".*x86HasSSE41"
 	// amd64:"ROUNDSD\t[$]0"
 	// s390x:"FIDBR\t[$]4"
 	// arm64:"FRINTND"
 	// wasm:"F64Nearest"
 	sink64[4] = math.RoundToEven(x)
 }

 func sqrt(x float64) float64 {
 	// amd64:"SQRTSD"
 	// 386/sse2:"SQRTSD" 386/softfloat:-"SQRTD"
 	// arm64:"FSQRTD"
 	// arm/7:"SQRTD"
 	// mips/hardfloat:"SQRTD" mips/softfloat:-"SQRTD"
 	// mips64/hardfloat:"SQRTD" mips64/softfloat:-"SQRTD"
 	// wasm:"F64Sqrt"
 	// ppc64x:"FSQRT"
 	return math.Sqrt(x)
 }

 func sqrt32(x float32) float32 {
 	// amd64:"SQRTSS"
 	// 386/sse2:"SQRTSS" 386/softfloat:-"SQRTS"
 	// arm64:"FSQRTS"
 	// arm/7:"SQRTF"
 	// mips/hardfloat:"SQRTF" mips/softfloat:-"SQRTF"
 	// mips64/hardfloat:"SQRTF" mips64/softfloat:-"SQRTF"
 	// wasm:"F32Sqrt"
 	// ppc64x:"FSQRTS"
 	return float32(math.Sqrt(float64(x)))
 }

 // Check that it's using integer registers
 func abs(x, y float64) {
 	// amd64:"BTRQ\t[$]63"
 	// arm64:"FABSD\t"
 	// s390x:"LPDFR\t",-"MOVD\t"     (no integer load/store)
 	// ppc64x:"FABS\t"
 	// riscv64:"FABSD\t"
 	// wasm:"F64Abs"
 	// arm/6:"ABSD\t"
 	// mips64/hardfloat:"ABSD\t"
 	// mips/hardfloat:"ABSD\t"
 	sink64[0] = math.Abs(x)

 	// amd64:"BTRQ\t[$]63","PXOR"    (TODO: this should be BTSQ)
 	// s390x:"LNDFR\t",-"MOVD\t"     (no integer load/store)
 	// ppc64x:"FNABS\t"
 	sink64[1] = -math.Abs(y)
 }

 // Check that it's using integer registers
 func abs32(x float32) float32 {
 	// s390x:"LPDFR",-"LDEBR",-"LEDBR"     (no float64 conversion)
 	return float32(math.Abs(float64(x)))
 }

 // Check that it's using integer registers
 func copysign(a, b, c float64) {
 	// amd64:"BTRQ\t[$]63","ANDQ","ORQ"
 	// s390x:"CPSDR",-"MOVD"         (no integer load/store)
 	// ppc64x:"FCPSGN"
 	// riscv64:"FSGNJD"
 	// wasm:"F64Copysign"
 	sink64[0] = math.Copysign(a, b)

 	// amd64:"BTSQ\t[$]63"
 	// s390x:"LNDFR\t",-"MOVD\t"     (no integer load/store)
 	// ppc64x:"FCPSGN"
 	// riscv64:"FSGNJD"
 	// arm64:"ORR", -"AND"
 	sink64[1] = math.Copysign(c, -1)

 	// Like math.Copysign(c, -1), but with integer operations. Useful
 	// for platforms that have a copysign opcode to see if it's detected.
 	// s390x:"LNDFR\t",-"MOVD\t"     (no integer load/store)
 	sink64[2] = math.Float64frombits(math.Float64bits(a) | 1<<63)

 	// amd64:"ANDQ","ORQ"
 	// s390x:"CPSDR\t",-"MOVD\t"     (no integer load/store)
 	// ppc64x:"FCPSGN"
 	// riscv64:"FSGNJD"
 	sink64[3] = math.Copysign(-1, c)
 }

 func fma(x, y, z float64) float64 {
 	// amd64/v3:-".*x86HasFMA"
 	// amd64:"VFMADD231SD"
 	// arm/6:"FMULAD"
 	// arm64:"FMADDD"
 	// s390x:"FMADD"
 	// ppc64x:"FMADD"
 	// riscv64:"FMADDD"
 	return math.FMA(x, y, z)
 }

 func fms(x, y, z float64) float64 {
 	// riscv64:"FMSUBD"
 	return math.FMA(x, y, -z)
 }

 func fnma(x, y, z float64) float64 {
 	// riscv64:"FNMADDD"
 	return math.FMA(-x, y, z)
 }

 func fnms(x, y, z float64) float64 {
 	// riscv64:"FNMSUBD"
 	return math.FMA(x, -y, -z)
 }

 func fromFloat64(f64 float64) uint64 {
 	// amd64:"MOVQ\tX.*, [^X].*"
 	// arm64:"FMOVD\tF.*, R.*"
 	// ppc64x:"MFVSRD"
 	// mips64/hardfloat:"MOVV\tF.*, R.*"
 	return math.Float64bits(f64+1) + 1
 }

 func fromFloat32(f32 float32) uint32 {
 	// amd64:"MOVL\tX.*, [^X].*"
 	// arm64:"FMOVS\tF.*, R.*"
 	// mips64/hardfloat:"MOVW\tF.*, R.*"
 	return math.Float32bits(f32+1) + 1
 }

 func toFloat64(u64 uint64) float64 {
 	// amd64:"MOVQ\t[^X].*, X.*"
 	// arm64:"FMOVD\tR.*, F.*"
 	// ppc64x:"MTVSRD"
 	// mips64/hardfloat:"MOVV\tR.*, F.*"
 	return math.Float64frombits(u64+1) + 1
 }

 func toFloat32(u32 uint32) float32 {
 	// amd64:"MOVL\t[^X].*, X.*"
 	// arm64:"FMOVS\tR.*, F.*"
 	// mips64/hardfloat:"MOVW\tR.*, F.*"
 	return math.Float32frombits(u32+1) + 1
 }

 // Test that comparisons with constants converted to float
 // are evaluated at compile-time

 func constantCheck64() bool {
 	// amd64:"(MOVB\t[$]0)|(XORL\t[A-Z][A-Z0-9]+, [A-Z][A-Z0-9]+)",-"FCMP",-"MOVB\t[$]1"
 	// s390x:"MOV(B|BZ|D)\t[$]0,",-"FCMPU",-"MOV(B|BZ|D)\t[$]1,"
 	return 0.5 == float64(uint32(1)) || 1.5 > float64(uint64(1<<63))
 }

 func constantCheck32() bool {
 	// amd64:"MOV(B|L)\t[$]1",-"FCMP",-"MOV(B|L)\t[$]0"
 	// s390x:"MOV(B|BZ|D)\t[$]1,",-"FCMPU",-"MOV(B|BZ|D)\t[$]0,"
 	return float32(0.5) <= float32(int64(1)) && float32(1.5) >= float32(int32(-1<<31))
 }

 // Test that integer constants are converted to floating point constants
 // at compile-time

 func constantConvert32(x float32) float32 {
 	// amd64:"MOVSS\t[$]f32.3f800000\\(SB\\)"
 	// s390x:"FMOVS\t[$]f32.3f800000\\(SB\\)"
 	// ppc64x:"FMOVS\t[$]f32.3f800000\\(SB\\)"
 	// arm64:"FMOVS\t[$]\\(1.0\\)"
 	if x > math.Float32frombits(0x3f800000) {
 		return -x
 	}
 	return x
 }

 func constantConvertInt32(x uint32) uint32 {
 	// amd64:-"MOVSS"
 	// s390x:-"FMOVS"
 	// ppc64x:-"FMOVS"
 	// arm64:-"FMOVS"
 	if x > math.Float32bits(1) {
 		return -x
 	}
 	return x
 }

 func nanGenerate64() float64 {
 	// Test to make sure we don't generate a NaN while constant propagating.
 	// See issue 36400.
 	zero := 0.0
 	// amd64:-"DIVSD"
 	inf := 1 / zero // +inf. We can constant propagate this one.
 	negone := -1.0

 	// amd64:"DIVSD"
 	z0 := zero / zero
 	// amd64:"MULSD"
 	z1 := zero * inf
 	// amd64:"SQRTSD"
 	z2 := math.Sqrt(negone)
 	return z0 + z1 + z2
 }

 func nanGenerate32() float32 {
 	zero := float32(0.0)
 	// amd64:-"DIVSS"
 	inf := 1 / zero // +inf. We can constant propagate this one.

 	// amd64:"DIVSS"
 	z0 := zero / zero
 	// amd64:"MULSS"
 	z1 := zero * inf
 	return z0 + z1
 }
	// 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"

	var sink64 [8]float64

	func approx(x float64) {
	// amd64/v2:-".x86HasSSE41" amd64/v3:-".x86HasSSE41"
	// amd64:"ROUNDSD\t[$]2"
	// s390x:"FIDBR\t[$]6"
	// arm64:"FRINTPD"
	// ppc64x:"FRIP"
	// wasm:"F64Ceil"
	sink64[0] = math.Ceil(x)

	// amd64/v2:-".x86HasSSE41" amd64/v3:-".x86HasSSE41"
	// amd64:"ROUNDSD\t[$]1"
	// s390x:"FIDBR\t[$]7"
	// arm64:"FRINTMD"
	// ppc64x:"FRIM"
	// wasm:"F64Floor"
	sink64[1] = math.Floor(x)

	// s390x:"FIDBR\t[$]1"
	// arm64:"FRINTAD"
	// ppc64x:"FRIN"
	sink64[2] = math.Round(x)

	// amd64/v2:-".x86HasSSE41" amd64/v3:-".x86HasSSE41"
	// amd64:"ROUNDSD\t[$]3"
	// s390x:"FIDBR\t[$]5"
	// arm64:"FRINTZD"
	// ppc64x:"FRIZ"
	// wasm:"F64Trunc"
	sink64[3] = math.Trunc(x)

	// amd64/v2:-".x86HasSSE41" amd64/v3:-".x86HasSSE41"
	// amd64:"ROUNDSD\t[$]0"
	// s390x:"FIDBR\t[$]4"
	// arm64:"FRINTND"
	// wasm:"F64Nearest"
	sink64[4] = math.RoundToEven(x)
	}

	func sqrt(x float64) float64 {
	// amd64:"SQRTSD"
	// 386/sse2:"SQRTSD" 386/softfloat:-"SQRTD"
	// arm64:"FSQRTD"
	// arm/7:"SQRTD"
	// mips/hardfloat:"SQRTD" mips/softfloat:-"SQRTD"
	// mips64/hardfloat:"SQRTD" mips64/softfloat:-"SQRTD"
	// wasm:"F64Sqrt"
	// ppc64x:"FSQRT"
	return math.Sqrt(x)
	}

	func sqrt32(x float32) float32 {
	// amd64:"SQRTSS"
	// 386/sse2:"SQRTSS" 386/softfloat:-"SQRTS"
	// arm64:"FSQRTS"
	// arm/7:"SQRTF"
	// mips/hardfloat:"SQRTF" mips/softfloat:-"SQRTF"
	// mips64/hardfloat:"SQRTF" mips64/softfloat:-"SQRTF"
	// wasm:"F32Sqrt"
	// ppc64x:"FSQRTS"
	return float32(math.Sqrt(float64(x)))
	}

	// Check that it's using integer registers
	func abs(x, y float64) {
	// amd64:"BTRQ\t[$]63"
	// arm64:"FABSD\t"
	// s390x:"LPDFR\t",-"MOVD\t" (no integer load/store)
	// ppc64x:"FABS\t"
	// riscv64:"FABSD\t"
	// wasm:"F64Abs"
	// arm/6:"ABSD\t"
	// mips64/hardfloat:"ABSD\t"
	// mips/hardfloat:"ABSD\t"
	sink64[0] = math.Abs(x)

	// amd64:"BTRQ\t[$]63","PXOR" (TODO: this should be BTSQ)
	// s390x:"LNDFR\t",-"MOVD\t" (no integer load/store)
	// ppc64x:"FNABS\t"
	sink64[1] = -math.Abs(y)
	}

	// Check that it's using integer registers
	func abs32(x float32) float32 {
	// s390x:"LPDFR",-"LDEBR",-"LEDBR" (no float64 conversion)
	return float32(math.Abs(float64(x)))
	}

	// Check that it's using integer registers
	func copysign(a, b, c float64) {
	// amd64:"BTRQ\t[$]63","ANDQ","ORQ"
	// s390x:"CPSDR",-"MOVD" (no integer load/store)
	// ppc64x:"FCPSGN"
	// riscv64:"FSGNJD"
	// wasm:"F64Copysign"
	sink64[0] = math.Copysign(a, b)

	// amd64:"BTSQ\t[$]63"
	// s390x:"LNDFR\t",-"MOVD\t" (no integer load/store)
	// ppc64x:"FCPSGN"
	// riscv64:"FSGNJD"
	// arm64:"ORR", -"AND"
	sink64[1] = math.Copysign(c, -1)

	// Like math.Copysign(c, -1), but with integer operations. Useful
	// for platforms that have a copysign opcode to see if it's detected.
	// s390x:"LNDFR\t",-"MOVD\t" (no integer load/store)
	sink64[2] = math.Float64frombits(math.Float64bits(a) \| 1<<63)

	// amd64:"ANDQ","ORQ"
	// s390x:"CPSDR\t",-"MOVD\t" (no integer load/store)
	// ppc64x:"FCPSGN"
	// riscv64:"FSGNJD"
	sink64[3] = math.Copysign(-1, c)
	}

	func fma(x, y, z float64) float64 {
	// amd64/v3:-".*x86HasFMA"
	// amd64:"VFMADD231SD"
	// arm/6:"FMULAD"
	// arm64:"FMADDD"
	// s390x:"FMADD"
	// ppc64x:"FMADD"
	// riscv64:"FMADDD"
	return math.FMA(x, y, z)
	}

	func fms(x, y, z float64) float64 {
	// riscv64:"FMSUBD"
	return math.FMA(x, y, -z)
	}

	func fnma(x, y, z float64) float64 {
	// riscv64:"FNMADDD"
	return math.FMA(-x, y, z)
	}

	func fnms(x, y, z float64) float64 {
	// riscv64:"FNMSUBD"
	return math.FMA(x, -y, -z)
	}

	func fromFloat64(f64 float64) uint64 {
	// amd64:"MOVQ\tX., [^X]."
	// arm64:"FMOVD\tF., R."
	// ppc64x:"MFVSRD"
	// mips64/hardfloat:"MOVV\tF., R."
	return math.Float64bits(f64+1) + 1
	}

	func fromFloat32(f32 float32) uint32 {
	// amd64:"MOVL\tX., [^X]."
	// arm64:"FMOVS\tF., R."
	// mips64/hardfloat:"MOVW\tF., R."
	return math.Float32bits(f32+1) + 1
	}

	func toFloat64(u64 uint64) float64 {
	// amd64:"MOVQ\t[^X]., X."
	// arm64:"FMOVD\tR., F."
	// ppc64x:"MTVSRD"
	// mips64/hardfloat:"MOVV\tR., F."
	return math.Float64frombits(u64+1) + 1
	}

	func toFloat32(u32 uint32) float32 {
	// amd64:"MOVL\t[^X]., X."
	// arm64:"FMOVS\tR., F."
	// mips64/hardfloat:"MOVW\tR., F."
	return math.Float32frombits(u32+1) + 1
	}

	// Test that comparisons with constants converted to float
	// are evaluated at compile-time

	func constantCheck64() bool {
	// amd64:"(MOVB\t[$]0)\|(XORL\t[A-Z][A-Z0-9]+, [A-Z][A-Z0-9]+)",-"FCMP",-"MOVB\t[$]1"
	// s390x:"MOV(B\|BZ\|D)\t[$]0,",-"FCMPU",-"MOV(B\|BZ\|D)\t[$]1,"
	return 0.5 == float64(uint32(1)) \|\| 1.5 > float64(uint64(1<<63))
	}

	func constantCheck32() bool {
	// amd64:"MOV(B\|L)\t[$]1",-"FCMP",-"MOV(B\|L)\t[$]0"
	// s390x:"MOV(B\|BZ\|D)\t[$]1,",-"FCMPU",-"MOV(B\|BZ\|D)\t[$]0,"
	return float32(0.5) <= float32(int64(1)) && float32(1.5) >= float32(int32(-1<<31))
	}

	// Test that integer constants are converted to floating point constants
	// at compile-time

	func constantConvert32(x float32) float32 {
	// amd64:"MOVSS\t[$]f32.3f800000\\(SB\\)"
	// s390x:"FMOVS\t[$]f32.3f800000\\(SB\\)"
	// ppc64x:"FMOVS\t[$]f32.3f800000\\(SB\\)"
	// arm64:"FMOVS\t[$]\\(1.0\\)"
	if x > math.Float32frombits(0x3f800000) {
	return -x
	}
	return x
	}

	func constantConvertInt32(x uint32) uint32 {
	// amd64:-"MOVSS"
	// s390x:-"FMOVS"
	// ppc64x:-"FMOVS"
	// arm64:-"FMOVS"
	if x > math.Float32bits(1) {
	return -x
	}
	return x
	}

	func nanGenerate64() float64 {
	// Test to make sure we don't generate a NaN while constant propagating.
	// See issue 36400.
	zero := 0.0
	// amd64:-"DIVSD"
	inf := 1 / zero // +inf. We can constant propagate this one.
	negone := -1.0

	// amd64:"DIVSD"
	z0 := zero / zero
	// amd64:"MULSD"
	z1 := zero * inf
	// amd64:"SQRTSD"
	z2 := math.Sqrt(negone)
	return z0 + z1 + z2
	}

	func nanGenerate32() float32 {
	zero := float32(0.0)
	// amd64:-"DIVSS"
	inf := 1 / zero // +inf. We can constant propagate this one.

	// amd64:"DIVSS"
	z0 := zero / zero
	// amd64:"MULSS"
	z1 := zero * inf
	return z0 + z1
	}