test: convert all math-related tests from asm_test

Change-Id: If542f0b5c5754e6eb2f9b302fe5a148ba9a57338
Reviewed-on: https://go-review.googlesource.com/98443
Run-TryBot: Giovanni Bajo <rasky@develer.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

src/cmd/compile/internal/gc/asm_test.go

@@ -224,19 +224,18 @@ var allAsmTests = []*asmTests{
 	{
 		arch:    "amd64",
 		os:      "linux",
-		imports: []string{"math", "math/bits", "unsafe", "runtime"},
+		imports: []string{"math/bits", "unsafe", "runtime"},
 		tests:   linuxAMD64Tests,
 	},
 	{
-		arch:    "386",
-		os:      "linux",
-		imports: []string{"math"},
-		tests:   linux386Tests,
+		arch:  "386",
+		os:    "linux",
+		tests: linux386Tests,
 	},
 	{
 		arch:    "s390x",
 		os:      "linux",
-		imports: []string{"math", "math/bits"},
+		imports: []string{"math/bits"},
 		tests:   linuxS390XTests,
 	},
 	{
@@ -248,25 +247,24 @@ var allAsmTests = []*asmTests{
 	{
 		arch:    "arm64",
 		os:      "linux",
-		imports: []string{"math", "math/bits"},
+		imports: []string{"math/bits"},
 		tests:   linuxARM64Tests,
 	},
 	{
 		arch:    "mips",
 		os:      "linux",
-		imports: []string{"math/bits", "math"},
+		imports: []string{"math/bits"},
 		tests:   linuxMIPSTests,
 	},
 	{
-		arch:    "mips64",
-		os:      "linux",
-		imports: []string{"math"},
-		tests:   linuxMIPS64Tests,
+		arch:  "mips64",
+		os:    "linux",
+		tests: linuxMIPS64Tests,
 	},
 	{
 		arch:    "ppc64le",
 		os:      "linux",
-		imports: []string{"math", "math/bits"},
+		imports: []string{"math/bits"},
 		tests:   linuxPPC64LETests,
 	},
 	{
@@ -694,14 +692,6 @@ var linuxAMD64Tests = []*asmTest{
 		}`,
 		pos: []string{"\tPOPCNTQ\t", "support_popcnt"},
 	},
-	{
-		fn: `
-		func $(x float64) float64 {
-			return math.Sqrt(x)
-		}
-		`,
-		pos: []string{"SQRTSD"},
-	},
 	// multiplication merging tests
 	{
 		fn: `
@@ -975,57 +965,7 @@ var linuxAMD64Tests = []*asmTest{
 		`,
 		pos: []string{"TEXT\t.*, [$]0-8"},
 	},
-	// math.Abs using integer registers
-	{
-		fn: `
-		func $(x float64) float64 {
-			return math.Abs(x)
-		}
-		`,
-		pos: []string{"\tSHLQ\t[$]1,", "\tSHRQ\t[$]1,"},
-	},
-	// math.Copysign using integer registers
-	{
-		fn: `
-		func $(x, y float64) float64 {
-			return math.Copysign(x, y)
-		}
-		`,
-		pos: []string{"\tSHLQ\t[$]1,", "\tSHRQ\t[$]1,", "\tSHRQ\t[$]63,", "\tSHLQ\t[$]63,", "\tORQ\t"},
-	},
 	// int <-> fp moves
-	{
-		fn: `
-		func $(x float64) uint64 {
-			return math.Float64bits(x+1) + 1
-		}
-		`,
-		pos: []string{"\tMOVQ\tX.*, [^X].*"},
-	},
-	{
-		fn: `
-		func $(x float32) uint32 {
-			return math.Float32bits(x+1) + 1
-		}
-		`,
-		pos: []string{"\tMOVL\tX.*, [^X].*"},
-	},
-	{
-		fn: `
-		func $(x uint64) float64 {
-			return math.Float64frombits(x+1) + 1
-		}
-		`,
-		pos: []string{"\tMOVQ\t[^X].*, X.*"},
-	},
-	{
-		fn: `
-		func $(x uint32) float32 {
-			return math.Float32frombits(x+1) + 1
-		}
-		`,
-		pos: []string{"\tMOVL\t[^X].*, X.*"},
-	},
 	{
 		fn: `
 		func $(x uint32) bool {
@@ -1290,16 +1230,6 @@ var linux386Tests = []*asmTest{
 		`,
 		neg: []string{"memmove"},
 	},
-
-	// Intrinsic tests for math
-	{
-		fn: `
-		func $(x float64) float64 {
-			return math.Sqrt(x)
-		}
-		`,
-		pos: []string{"FSQRT|SQRTSD"}, // 387|sse2
-	},
 }
 
 var linuxS390XTests = []*asmTest{
@@ -1514,47 +1444,6 @@ var linuxS390XTests = []*asmTest{
 		`,
 		pos: []string{"\tFLOGR\t"},
 	},
-	// Intrinsic tests for math.
-	{
-		fn: `
-		func ceil(x float64) float64 {
-			return math.Ceil(x)
-		}
-		`,
-		pos: []string{"\tFIDBR\t[$]6"},
-	},
-	{
-		fn: `
-		func floor(x float64) float64 {
-			return math.Floor(x)
-		}
-		`,
-		pos: []string{"\tFIDBR\t[$]7"},
-	},
-	{
-		fn: `
-		func round(x float64) float64 {
-			return math.Round(x)
-		}
-		`,
-		pos: []string{"\tFIDBR\t[$]1"},
-	},
-	{
-		fn: `
-		func trunc(x float64) float64 {
-			return math.Trunc(x)
-		}
-		`,
-		pos: []string{"\tFIDBR\t[$]5"},
-	},
-	{
-		fn: `
-		func roundToEven(x float64) float64 {
-			return math.RoundToEven(x)
-		}
-		`,
-		pos: []string{"\tFIDBR\t[$]4"},
-	},
 	{
 		// check that stack store is optimized away
 		fn: `
@@ -1565,118 +1454,6 @@ var linuxS390XTests = []*asmTest{
 		`,
 		pos: []string{"TEXT\t.*, [$]0-8"},
 	},
-	// Constant propagation through raw bits conversions.
-	{
-		// uint32 constant converted to float32 constant
-		fn: `
-		func $(x float32) float32 {
-			if x > math.Float32frombits(0x3f800000) {
-				return -x
-			}
-			return x
-		}
-		`,
-		pos: []string{"\tFMOVS\t[$]f32.3f800000\\(SB\\)"},
-	},
-	{
-		// float32 constant converted to uint32 constant
-		fn: `
-		func $(x uint32) uint32 {
-			if x > math.Float32bits(1) {
-				return -x
-			}
-			return x
-		}
-		`,
-		neg: []string{"\tFMOVS\t"},
-	},
-	// Constant propagation through float comparisons.
-	{
-		fn: `
-		func $() bool {
-			return 0.5 == float64(uint32(1)) ||
-				1.5 > float64(uint64(1<<63)) ||
-				math.NaN() == math.NaN()
-		}
-		`,
-		pos: []string{"\tMOV(B|BZ|D)\t[$]0,"},
-		neg: []string{"\tFCMPU\t", "\tMOV(B|BZ|D)\t[$]1,"},
-	},
-	{
-		fn: `
-		func $() bool {
-			return float32(0.5) <= float32(int64(1)) &&
-				float32(1.5) >= float32(int32(-1<<31)) &&
-				float32(math.NaN()) != float32(math.NaN())
-		}
-		`,
-		pos: []string{"\tMOV(B|BZ|D)\t[$]1,"},
-		neg: []string{"\tCEBR\t", "\tMOV(B|BZ|D)\t[$]0,"},
-	},
-	// math tests
-	{
-		fn: `
-		func $(x float64) float64 {
-			return math.Abs(x)
-		}
-		`,
-		pos: []string{"\tLPDFR\t"},
-		neg: []string{"\tMOVD\t"}, // no integer loads/stores
-	},
-	{
-		fn: `
-		func $(x float32) float32 {
-			return float32(math.Abs(float64(x)))
-		}
-		`,
-		pos: []string{"\tLPDFR\t"},
-		neg: []string{"\tLDEBR\t", "\tLEDBR\t"}, // no float64 conversion
-	},
-	{
-		fn: `
-		func $(x float64) float64 {
-			return math.Float64frombits(math.Float64bits(x)|1<<63)
-		}
-		`,
-		pos: []string{"\tLNDFR\t"},
-		neg: []string{"\tMOVD\t"}, // no integer loads/stores
-	},
-	{
-		fn: `
-		func $(x float64) float64 {
-			return -math.Abs(x)
-		}
-		`,
-		pos: []string{"\tLNDFR\t"},
-		neg: []string{"\tMOVD\t"}, // no integer loads/stores
-	},
-	{
-		fn: `
-		func $(x, y float64) float64 {
-			return math.Copysign(x, y)
-		}
-		`,
-		pos: []string{"\tCPSDR\t"},
-		neg: []string{"\tMOVD\t"}, // no integer loads/stores
-	},
-	{
-		fn: `
-		func $(x float64) float64 {
-			return math.Copysign(x, -1)
-		}
-		`,
-		pos: []string{"\tLNDFR\t"},
-		neg: []string{"\tMOVD\t"}, // no integer loads/stores
-	},
-	{
-		fn: `
-		func $(x float64) float64 {
-			return math.Copysign(-1, x)
-		}
-		`,
-		pos: []string{"\tCPSDR\t"},
-		neg: []string{"\tMOVD\t"}, // no integer loads/stores
-	},
 }
 
 var linuxARMTests = []*asmTest{
@@ -2139,47 +1916,6 @@ var linuxARM64Tests = []*asmTest{
 		pos: []string{"\tMOVHU\t\\(R[0-9]+\\)"},
 		neg: []string{"ORR\tR[0-9]+<<8\t"},
 	},
-	// Intrinsic tests for math.
-	{
-		fn: `
-		func sqrt(x float64) float64 {
-			return math.Sqrt(x)
-		}
-		`,
-		pos: []string{"FSQRTD"},
-	},
-	{
-		fn: `
-		func ceil(x float64) float64 {
-			return math.Ceil(x)
-		}
-		`,
-		pos: []string{"FRINTPD"},
-	},
-	{
-		fn: `
-		func floor(x float64) float64 {
-			return math.Floor(x)
-		}
-		`,
-		pos: []string{"FRINTMD"},
-	},
-	{
-		fn: `
-		func round(x float64) float64 {
-			return math.Round(x)
-		}
-		`,
-		pos: []string{"FRINTAD"},
-	},
-	{
-		fn: `
-		func trunc(x float64) float64 {
-			return math.Trunc(x)
-		}
-		`,
-		pos: []string{"FRINTZD"},
-	},
 	{
 		// make sure that CSEL is emitted for conditional moves
 		fn: `
@@ -2521,15 +2257,6 @@ var linuxMIPSTests = []*asmTest{
 		`,
 		pos: []string{"\tCLZ\t"},
 	},
-	// Intrinsic tests for math.
-	{
-		fn: `
-		func $(x float64) float64 {
-			return math.Sqrt(x)
-		}
-		`,
-		pos: []string{"SQRTD"},
-	},
 	{
 		// check that stack store is optimized away
 		fn: `
@@ -2553,15 +2280,6 @@ var linuxMIPS64Tests = []*asmTest{
 		pos: []string{"SLLV\t\\$17"},
 		neg: []string{"SGT"},
 	},
-	// Intrinsic tests for math.
-	{
-		fn: `
-		func $(x float64) float64 {
-			return math.Sqrt(x)
-		}
-		`,
-		pos: []string{"SQRTD"},
-	},
 }
 
 var linuxPPC64LETests = []*asmTest{
@@ -2663,24 +2381,6 @@ var linuxPPC64LETests = []*asmTest{
 		pos: []string{"\tROTL\t"},
 	},
 
-	{
-		fn: `
-                func f12(a, b float64) float64 {
-                        return math.Copysign(a, b)
-                }
-                `,
-		pos: []string{"\tFCPSGN\t"},
-	},
-
-	{
-		fn: `
-                func f13(a float64) float64 {
-                        return math.Abs(a)
-                }
-                `,
-		pos: []string{"\tFABS\t"},
-	},
-
 	{
 		// check that stack store is optimized away
 		fn: `
@@ -2691,31 +2391,6 @@ var linuxPPC64LETests = []*asmTest{
 		`,
 		pos: []string{"TEXT\t.*, [$]0-8"},
 	},
-	// Constant propagation through raw bits conversions.
-	{
-		// uint32 constant converted to float32 constant
-		fn: `
-		func $(x float32) float32 {
-			if x > math.Float32frombits(0x3f800000) {
-				return -x
-			}
-			return x
-		}
-		`,
-		pos: []string{"\tFMOVS\t[$]f32.3f800000\\(SB\\)"},
-	},
-	{
-		// float32 constant converted to uint32 constant
-		fn: `
-		func $(x uint32) uint32 {
-			if x > math.Float32bits(1) {
-				return -x
-			}
-			return x
-		}
-		`,
-		neg: []string{"\tFMOVS\t"},
-	},
 }
 
 var plan9AMD64Tests = []*asmTest{

test/codegen/math.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
+
+import "math"
+
+var sink64 [8]float64
+
+func approx(x float64) {
+	// s390x:"FIDBR\t[$]6"
+	// arm64:"FRINTPD"
+	sink64[0] = math.Ceil(x)
+
+	// s390x:"FIDBR\t[$]7"
+	// arm64:"FRINTMD"
+	sink64[1] = math.Floor(x)
+
+	// s390x:"FIDBR\t[$]1"
+	// arm64:"FRINTAD"
+	sink64[2] = math.Round(x)
+
+	// s390x:"FIDBR\t[$]5"
+	// arm64:"FRINTZD"
+	sink64[3] = math.Trunc(x)
+
+	// s390x:"FIDBR\t[$]4"
+	sink64[4] = math.RoundToEven(x)
+}
+
+func sqrt(x float64) float64 {
+	// amd64:"SQRTSD"
+	// 386:"FSQRT|SQRTSD"   (387 or sse2)
+	// arm64:"FSQRTD"
+	// mips:"SQRTD" mips64:"SQRTD"
+	return math.Sqrt(x)
+}
+
+// Check that it's using integer registers
+func abs(x, y float64) {
+	// amd64:"SHLQ\t[$]1","SHRQ\t[$]1,"
+	// s390x:"LPDFR\t",-"MOVD\t"     (no integer load/store)
+	// ppc64le:"FABS\t"
+	sink64[0] = math.Abs(x)
+
+	// amd64:"SHLQ\t[$]1","SHRQ\t[$]1,"
+	// s390x:"LNDFR\t",-"MOVD\t"     (no integer load/store)
+	// ppc64le:"FNABS\t"
+	sink64[1] = -math.Abs(y)
+}
+
+// Check that it's using integer registers
+func abs32(x float32) float32 {
+	// s390x:"LPDFR",-"LDEBR",-"LEDBR"     (no float64 conversion)
+	return float32(math.Abs(float64(x)))
+}
+
+// Check that it's using integer registers
+func copysign(a, b, c float64) {
+	// amd64:"SHLQ\t[$]1","SHRQ\t[$]1","SHRQ\t[$]63","SHLQ\t[$]63","ORQ"
+	// s390x:"CPSDR",-"MOVD"         (no integer load/store)
+	// ppc64le:"FCPSGN"
+	sink64[0] = math.Copysign(a, b)
+
+	// amd64:"SHLQ\t[$]1","SHRQ\t[$]1",-"SHRQ\t[$]63",-"SHLQ\t[$]63","ORQ"
+	// s390x:"LNDFR\t",-"MOVD\t"     (no integer load/store)
+	// ppc64le:"FCPSGN"
+	sink64[1] = math.Copysign(c, -1)
+
+	// Like math.Copysign(c, -1), but with integer operations. Useful
+	// for platforms that have a copysign opcode to see if it's detected.
+	// s390x:"LNDFR\t",-"MOVD\t"     (no integer load/store)
+	sink64[2] = math.Float64frombits(math.Float64bits(a) | 1<<63)
+
+	// amd64:-"SHLQ\t[$]1",-"SHRQ\t[$]1","SHRQ\t[$]63","SHLQ\t[$]63","ORQ"
+	// s390x:"CPSDR\t",-"MOVD\t"     (no integer load/store)
+	// ppc64le:"FCPSGN"
+	sink64[3] = math.Copysign(-1, c)
+}
+
+func fromFloat64(f64 float64) uint64 {
+	// amd64:"MOVQ\tX.*, [^X].*"
+	return math.Float64bits(f64+1) + 1
+}
+
+func fromFloat32(f32 float32) uint32 {
+	// amd64:"MOVL\tX.*, [^X].*"
+	return math.Float32bits(f32+1) + 1
+}
+
+func toFloat64(u64 uint64) float64 {
+	// amd64:"MOVQ\t[^X].*, X.*"
+	return math.Float64frombits(u64+1) + 1
+}
+
+func toFloat32(u32 uint32) float32 {
+	// amd64:"MOVL\t[^X].*, X.*"
+	return math.Float32frombits(u32+1) + 1
+}
+
+// Test that comparisons with constants converted to float
+// are evaluated at compile-time
+
+func constantCheck64() bool {
+	// amd64:"MOVB\t[$]0",-"FCMP",-"MOVB\t[$]1"
+	// s390x:"MOV(B|BZ|D)\t[$]0,",-"FCMPU",-"MOV(B|BZ|D)\t[$]1,"
+	return 0.5 == float64(uint32(1)) || 1.5 > float64(uint64(1<<63)) || math.NaN() == math.NaN()
+}
+
+func constantCheck32() bool {
+	// amd64:"MOVB\t[$]1",-"FCMP",-"MOVB\t[$]0"
+	// s390x:"MOV(B|BZ|D)\t[$]1,",-"FCMPU",-"MOV(B|BZ|D)\t[$]0,"
+	return float32(0.5) <= float32(int64(1)) && float32(1.5) >= float32(int32(-1<<31)) && float32(math.NaN()) != float32(math.NaN())
+}
+
+// Test that integer constants are converted to floating point constants
+// at compile-time
+
+func constantConvert32(x float32) float32 {
+	// amd64:"MOVSS\t[$]f32.3f800000\\(SB\\)"
+	// s390x:"FMOVS\t[$]f32.3f800000\\(SB\\)"
+	// ppc64le:"FMOVS\t[$]f32.3f800000\\(SB\\)"
+	if x > math.Float32frombits(0x3f800000) {
+		return -x
+	}
+	return x
+}
+
+func constantConvertInt32(x uint32) uint32 {
+	// amd64:-"MOVSS"
+	// s390x:-"FMOVS"
+	// ppc64le:-"FMOVS"
+	if x > math.Float32bits(1) {
+		return -x
+	}
+	return x
+}

test/codegen/rotate.go

@@ -6,8 +6,6 @@
 
 package codegen
 
-import "math"
-
 func rot32(x uint32) uint32 {
 	var a uint32
 	a += x<<7 | x>>25 // amd64:"ROLL.*[$]7"  arm:"MOVW.*@>25"
@@ -23,9 +21,3 @@ func rot64(x uint64) uint64 {
 	a += x<<9 ^ x>>55 // amd64:"ROL"
 	return a
 }
-
-func copysign(a, b float64) float64 {
-	// amd64:"SHLQ\t[$]1","SHRQ\t[$]1","SHRQ\t[$]63","SHLQ\t[$]63","ORQ"
-	// ppc64le:"FCPSGN" s390x:"CPSDR",-"MOVD"
-	return math.Copysign(a, b)
-}