| // 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 integer types. |
| // For codegen tests on float types, see floats.go. |
| |
| // ----------------- // |
| // Subtraction // |
| // ----------------- // |
| |
| var ef int |
| |
| func SubMem(arr []int, b, c, d int) int { |
| // 386:`SUBL\s[A-Z]+,\s8\([A-Z]+\)` |
| // amd64:`SUBQ\s[A-Z]+,\s16\([A-Z]+\)` |
| arr[2] -= b |
| // 386:`SUBL\s[A-Z]+,\s12\([A-Z]+\)` |
| // amd64:`SUBQ\s[A-Z]+,\s24\([A-Z]+\)` |
| arr[3] -= b |
| // 386:`DECL\s16\([A-Z]+\)` |
| arr[4]-- |
| // 386:`ADDL\s[$]-20,\s20\([A-Z]+\)` |
| arr[5] -= 20 |
| // 386:`SUBL\s\([A-Z]+\)\([A-Z]+\*4\),\s[A-Z]+` |
| ef -= arr[b] |
| // 386:`SUBL\s[A-Z]+,\s\([A-Z]+\)\([A-Z]+\*4\)` |
| arr[c] -= b |
| // 386:`ADDL\s[$]-15,\s\([A-Z]+\)\([A-Z]+\*4\)` |
| arr[d] -= 15 |
| // 386:`DECL\s\([A-Z]+\)\([A-Z]+\*4\)` |
| arr[b]-- |
| // amd64:`DECQ\s64\([A-Z]+\)` |
| arr[8]-- |
| // 386:"SUBL\t4" |
| // amd64:"SUBQ\t8" |
| return arr[0] - arr[1] |
| } |
| |
| func SubFromConst(a int) int { |
| // ppc64le: `SUBC\tR[0-9]+,\s[$]40,\sR` |
| // ppc64: `SUBC\tR[0-9]+,\s[$]40,\sR` |
| b := 40 - a |
| return b |
| } |
| |
| func SubFromConstNeg(a int) int { |
| // ppc64le: `ADD\t[$]40,\sR[0-9]+,\sR` |
| // ppc64: `ADD\t[$]40,\sR[0-9]+,\sR` |
| c := 40 - (-a) |
| return c |
| } |
| |
| func SubSubFromConst(a int) int { |
| // ppc64le: `ADD\t[$]20,\sR[0-9]+,\sR` |
| // ppc64: `ADD\t[$]20,\sR[0-9]+,\sR` |
| c := 40 - (20 - a) |
| return c |
| } |
| |
| func AddSubFromConst(a int) int { |
| // ppc64le: `SUBC\tR[0-9]+,\s[$]60,\sR` |
| // ppc64: `SUBC\tR[0-9]+,\s[$]60,\sR` |
| c := 40 + (20 - a) |
| return c |
| } |
| |
| func NegSubFromConst(a int) int { |
| // ppc64le: `ADD\t[$]-20,\sR[0-9]+,\sR` |
| // ppc64: `ADD\t[$]-20,\sR[0-9]+,\sR` |
| c := -(20 - a) |
| return c |
| } |
| |
| func NegAddFromConstNeg(a int) int { |
| // ppc64le: `SUBC\tR[0-9]+,\s[$]40,\sR` |
| // ppc64: `SUBC\tR[0-9]+,\s[$]40,\sR` |
| c := -(-40 + a) |
| return c |
| } |
| |
| func SubSubNegSimplify(a, b int) int { |
| // amd64:"NEGQ" |
| // ppc64:"NEG" |
| // ppc64le:"NEG" |
| r := (a - b) - a |
| return r |
| } |
| |
| func SubAddSimplify(a, b int) int { |
| // amd64:-"SUBQ",-"ADDQ" |
| // ppc64:-"SUB",-"ADD" |
| // ppc64le:-"SUB",-"ADD" |
| r := a + (b - a) |
| return r |
| } |
| |
| func SubAddNegSimplify(a, b int) int { |
| // amd64:"NEGQ",-"ADDQ",-"SUBQ" |
| // ppc64:"NEG",-"ADD",-"SUB" |
| // ppc64le:"NEG",-"ADD",-"SUB" |
| r := a - (b + a) |
| return r |
| } |
| |
| func AddAddSubSimplify(a, b, c int) int { |
| // amd64:-"SUBQ" |
| // ppc64:-"SUB" |
| // ppc64le:-"SUB" |
| r := a + (b + (c - a)) |
| return r |
| } |
| |
| // -------------------- // |
| // Multiplication // |
| // -------------------- // |
| |
| func Pow2Muls(n1, n2 int) (int, int) { |
| // amd64:"SHLQ\t[$]5",-"IMULQ" |
| // 386:"SHLL\t[$]5",-"IMULL" |
| // arm:"SLL\t[$]5",-"MUL" |
| // arm64:"LSL\t[$]5",-"MUL" |
| // ppc64:"SLD\t[$]5",-"MUL" |
| // ppc64le:"SLD\t[$]5",-"MUL" |
| a := n1 * 32 |
| |
| // amd64:"SHLQ\t[$]6",-"IMULQ" |
| // 386:"SHLL\t[$]6",-"IMULL" |
| // arm:"SLL\t[$]6",-"MUL" |
| // arm64:`NEG\sR[0-9]+<<6,\sR[0-9]+`,-`LSL`,-`MUL` |
| // ppc64:"SLD\t[$]6","NEG\\sR[0-9]+,\\sR[0-9]+",-"MUL" |
| // ppc64le:"SLD\t[$]6","NEG\\sR[0-9]+,\\sR[0-9]+",-"MUL" |
| b := -64 * n2 |
| |
| return a, b |
| } |
| |
| func Mul_96(n int) int { |
| // amd64:`SHLQ\t[$]5`,`LEAQ\t\(.*\)\(.*\*2\),`,-`IMULQ` |
| // 386:`SHLL\t[$]5`,`LEAL\t\(.*\)\(.*\*2\),`,-`IMULL` |
| // arm64:`LSL\t[$]5`,`ADD\sR[0-9]+<<1,\sR[0-9]+`,-`MUL` |
| // arm:`SLL\t[$]5`,`ADD\sR[0-9]+<<1,\sR[0-9]+`,-`MUL` |
| // s390x:`SLD\t[$]5`,`SLD\t[$]6`,-`MULLD` |
| return n * 96 |
| } |
| |
| func Mul_n120(n int) int { |
| // s390x:`SLD\t[$]3`,`SLD\t[$]7`,-`MULLD` |
| return n * -120 |
| } |
| |
| func MulMemSrc(a []uint32, b []float32) { |
| // 386:`IMULL\s4\([A-Z]+\),\s[A-Z]+` |
| a[0] *= a[1] |
| // 386/sse2:`MULSS\s4\([A-Z]+\),\sX[0-9]+` |
| // amd64:`MULSS\s4\([A-Z]+\),\sX[0-9]+` |
| b[0] *= b[1] |
| } |
| |
| // Multiplications merging tests |
| |
| func MergeMuls1(n int) int { |
| // amd64:"IMUL3Q\t[$]46" |
| // 386:"IMUL3L\t[$]46" |
| // ppc64le:"MULLD\t[$]46" |
| // ppc64:"MULLD\t[$]46" |
| return 15*n + 31*n // 46n |
| } |
| |
| func MergeMuls2(n int) int { |
| // amd64:"IMUL3Q\t[$]23","(ADDQ\t[$]29)|(LEAQ\t29)" |
| // 386:"IMUL3L\t[$]23","ADDL\t[$]29" |
| // ppc64le/power9:"MADDLD",-"MULLD\t[$]23",-"ADD\t[$]29" |
| // ppc64le/power8:"MULLD\t[$]23","ADD\t[$]29" |
| return 5*n + 7*(n+1) + 11*(n+2) // 23n + 29 |
| } |
| |
| func MergeMuls3(a, n int) int { |
| // amd64:"ADDQ\t[$]19",-"IMULQ\t[$]19" |
| // 386:"ADDL\t[$]19",-"IMULL\t[$]19" |
| // ppc64:"ADD\t[$]19",-"MULLD\t[$]19" |
| // ppc64le:"ADD\t[$]19",-"MULLD\t[$]19" |
| return a*n + 19*n // (a+19)n |
| } |
| |
| func MergeMuls4(n int) int { |
| // amd64:"IMUL3Q\t[$]14" |
| // 386:"IMUL3L\t[$]14" |
| // ppc64:"MULLD\t[$]14" |
| // ppc64le:"MULLD\t[$]14" |
| return 23*n - 9*n // 14n |
| } |
| |
| func MergeMuls5(a, n int) int { |
| // amd64:"ADDQ\t[$]-19",-"IMULQ\t[$]19" |
| // 386:"ADDL\t[$]-19",-"IMULL\t[$]19" |
| // ppc64:"ADD\t[$]-19",-"MULLD\t[$]19" |
| // ppc64le:"ADD\t[$]-19",-"MULLD\t[$]19" |
| return a*n - 19*n // (a-19)n |
| } |
| |
| // -------------- // |
| // Division // |
| // -------------- // |
| |
| func DivMemSrc(a []float64) { |
| // 386/sse2:`DIVSD\s8\([A-Z]+\),\sX[0-9]+` |
| // amd64:`DIVSD\s8\([A-Z]+\),\sX[0-9]+` |
| a[0] /= a[1] |
| } |
| |
| func Pow2Divs(n1 uint, n2 int) (uint, int) { |
| // 386:"SHRL\t[$]5",-"DIVL" |
| // amd64:"SHRQ\t[$]5",-"DIVQ" |
| // arm:"SRL\t[$]5",-".*udiv" |
| // arm64:"LSR\t[$]5",-"UDIV" |
| // ppc64:"SRD" |
| // ppc64le:"SRD" |
| a := n1 / 32 // unsigned |
| |
| // amd64:"SARQ\t[$]6",-"IDIVQ" |
| // 386:"SARL\t[$]6",-"IDIVL" |
| // arm:"SRA\t[$]6",-".*udiv" |
| // arm64:"ASR\t[$]6",-"SDIV" |
| // ppc64:"SRAD" |
| // ppc64le:"SRAD" |
| b := n2 / 64 // signed |
| |
| return a, b |
| } |
| |
| // Check that constant divisions get turned into MULs |
| func ConstDivs(n1 uint, n2 int) (uint, int) { |
| // amd64:"MOVQ\t[$]-1085102592571150095","MULQ",-"DIVQ" |
| // 386:"MOVL\t[$]-252645135","MULL",-"DIVL" |
| // arm64:`MOVD`,`UMULH`,-`DIV` |
| // arm:`MOVW`,`MUL`,-`.*udiv` |
| a := n1 / 17 // unsigned |
| |
| // amd64:"MOVQ\t[$]-1085102592571150095","IMULQ",-"IDIVQ" |
| // 386:"MOVL\t[$]-252645135","IMULL",-"IDIVL" |
| // arm64:`SMULH`,-`DIV` |
| // arm:`MOVW`,`MUL`,-`.*udiv` |
| b := n2 / 17 // signed |
| |
| return a, b |
| } |
| |
| func FloatDivs(a []float32) float32 { |
| // amd64:`DIVSS\s8\([A-Z]+\),\sX[0-9]+` |
| // 386/sse2:`DIVSS\s8\([A-Z]+\),\sX[0-9]+` |
| return a[1] / a[2] |
| } |
| |
| func Pow2Mods(n1 uint, n2 int) (uint, int) { |
| // 386:"ANDL\t[$]31",-"DIVL" |
| // amd64:"ANDL\t[$]31",-"DIVQ" |
| // arm:"AND\t[$]31",-".*udiv" |
| // arm64:"AND\t[$]31",-"UDIV" |
| // ppc64:"ANDCC\t[$]31" |
| // ppc64le:"ANDCC\t[$]31" |
| a := n1 % 32 // unsigned |
| |
| // 386:"SHRL",-"IDIVL" |
| // amd64:"SHRQ",-"IDIVQ" |
| // arm:"SRA",-".*udiv" |
| // arm64:"ASR",-"REM" |
| // ppc64:"SRAD" |
| // ppc64le:"SRAD" |
| b := n2 % 64 // signed |
| |
| return a, b |
| } |
| |
| // Check that signed divisibility checks get converted to AND on low bits |
| func Pow2DivisibleSigned(n1, n2 int) (bool, bool) { |
| // 386:"TESTL\t[$]63",-"DIVL",-"SHRL" |
| // amd64:"TESTQ\t[$]63",-"DIVQ",-"SHRQ" |
| // arm:"AND\t[$]63",-".*udiv",-"SRA" |
| // arm64:"TST\t[$]63",-"UDIV",-"ASR",-"AND" |
| // ppc64:"ANDCC\t[$]63",-"SRAD" |
| // ppc64le:"ANDCC\t[$]63",-"SRAD" |
| a := n1%64 == 0 // signed divisible |
| |
| // 386:"TESTL\t[$]63",-"DIVL",-"SHRL" |
| // amd64:"TESTQ\t[$]63",-"DIVQ",-"SHRQ" |
| // arm:"AND\t[$]63",-".*udiv",-"SRA" |
| // arm64:"TST\t[$]63",-"UDIV",-"ASR",-"AND" |
| // ppc64:"ANDCC\t[$]63",-"SRAD" |
| // ppc64le:"ANDCC\t[$]63",-"SRAD" |
| b := n2%64 != 0 // signed indivisible |
| |
| return a, b |
| } |
| |
| // Check that constant modulo divs get turned into MULs |
| func ConstMods(n1 uint, n2 int) (uint, int) { |
| // amd64:"MOVQ\t[$]-1085102592571150095","MULQ",-"DIVQ" |
| // 386:"MOVL\t[$]-252645135","MULL",-"DIVL" |
| // arm64:`MOVD`,`UMULH`,-`DIV` |
| // arm:`MOVW`,`MUL`,-`.*udiv` |
| a := n1 % 17 // unsigned |
| |
| // amd64:"MOVQ\t[$]-1085102592571150095","IMULQ",-"IDIVQ" |
| // 386:"MOVL\t[$]-252645135","IMULL",-"IDIVL" |
| // arm64:`SMULH`,-`DIV` |
| // arm:`MOVW`,`MUL`,-`.*udiv` |
| b := n2 % 17 // signed |
| |
| return a, b |
| } |
| |
| // Check that divisibility checks x%c==0 are converted to MULs and rotates |
| func Divisible(n1 uint, n2 int) (bool, bool, bool, bool) { |
| // amd64:"MOVQ\t[$]-6148914691236517205","IMULQ","ROLQ\t[$]63",-"DIVQ" |
| // 386:"IMUL3L\t[$]-1431655765","ROLL\t[$]31",-"DIVQ" |
| // arm64:"MOVD\t[$]-6148914691236517205","MOVD\t[$]3074457345618258602","MUL","ROR",-"DIV" |
| // arm:"MUL","CMP\t[$]715827882",-".*udiv" |
| // ppc64:"MULLD","ROTL\t[$]63" |
| // ppc64le:"MULLD","ROTL\t[$]63" |
| evenU := n1%6 == 0 |
| |
| // amd64:"MOVQ\t[$]-8737931403336103397","IMULQ",-"ROLQ",-"DIVQ" |
| // 386:"IMUL3L\t[$]678152731",-"ROLL",-"DIVQ" |
| // arm64:"MOVD\t[$]-8737931403336103397","MUL",-"ROR",-"DIV" |
| // arm:"MUL","CMP\t[$]226050910",-".*udiv" |
| // ppc64:"MULLD",-"ROTL" |
| // ppc64le:"MULLD",-"ROTL" |
| oddU := n1%19 == 0 |
| |
| // amd64:"IMULQ","ADD","ROLQ\t[$]63",-"DIVQ" |
| // 386:"IMUL3L\t[$]-1431655765","ADDL\t[$]715827882","ROLL\t[$]31",-"DIVQ" |
| // arm64:"MUL","ADD\tR","ROR",-"DIV" |
| // arm:"MUL","ADD\t[$]715827882",-".*udiv" |
| // ppc64/power8:"MULLD","ADD","ROTL\t[$]63" |
| // ppc64le/power8:"MULLD","ADD","ROTL\t[$]63" |
| // ppc64/power9:"MADDLD","ROTL\t[$]63" |
| // ppc64le/power9:"MADDLD","ROTL\t[$]63" |
| evenS := n2%6 == 0 |
| |
| // amd64:"IMULQ","ADD",-"ROLQ",-"DIVQ" |
| // 386:"IMUL3L\t[$]678152731","ADDL\t[$]113025455",-"ROLL",-"DIVQ" |
| // arm64:"MUL","MOVD\t[$]485440633518672410","ADD",-"ROR",-"DIV" |
| // arm:"MUL","ADD\t[$]113025455",-".*udiv" |
| // ppc64/power8:"MULLD","ADD",-"ROTL" |
| // ppc64/power9:"MADDLD",-"ROTL" |
| // ppc64le/power8:"MULLD","ADD",-"ROTL" |
| // ppc64le/power9:"MADDLD",-"ROTL" |
| oddS := n2%19 == 0 |
| |
| return evenU, oddU, evenS, oddS |
| } |
| |
| // Check that fix-up code is not generated for divisions where it has been proven that |
| // that the divisor is not -1 or that the dividend is > MinIntNN. |
| func NoFix64A(divr int64) (int64, int64) { |
| var d int64 = 42 |
| var e int64 = 84 |
| if divr > 5 { |
| d /= divr // amd64:-"JMP" |
| e %= divr // amd64:-"JMP" |
| // The following statement is to avoid conflict between the above check |
| // and the normal JMP generated at the end of the block. |
| d += e |
| } |
| return d, e |
| } |
| |
| func NoFix64B(divd int64) (int64, int64) { |
| var d int64 |
| var e int64 |
| var divr int64 = -1 |
| if divd > -9223372036854775808 { |
| d = divd / divr // amd64:-"JMP" |
| e = divd % divr // amd64:-"JMP" |
| d += e |
| } |
| return d, e |
| } |
| |
| func NoFix32A(divr int32) (int32, int32) { |
| var d int32 = 42 |
| var e int32 = 84 |
| if divr > 5 { |
| // amd64:-"JMP" |
| // 386:-"JMP" |
| d /= divr |
| // amd64:-"JMP" |
| // 386:-"JMP" |
| e %= divr |
| d += e |
| } |
| return d, e |
| } |
| |
| func NoFix32B(divd int32) (int32, int32) { |
| var d int32 |
| var e int32 |
| var divr int32 = -1 |
| if divd > -2147483648 { |
| // amd64:-"JMP" |
| // 386:-"JMP" |
| d = divd / divr |
| // amd64:-"JMP" |
| // 386:-"JMP" |
| e = divd % divr |
| d += e |
| } |
| return d, e |
| } |
| |
| func NoFix16A(divr int16) (int16, int16) { |
| var d int16 = 42 |
| var e int16 = 84 |
| if divr > 5 { |
| // amd64:-"JMP" |
| // 386:-"JMP" |
| d /= divr |
| // amd64:-"JMP" |
| // 386:-"JMP" |
| e %= divr |
| d += e |
| } |
| return d, e |
| } |
| |
| func NoFix16B(divd int16) (int16, int16) { |
| var d int16 |
| var e int16 |
| var divr int16 = -1 |
| if divd > -32768 { |
| // amd64:-"JMP" |
| // 386:-"JMP" |
| d = divd / divr |
| // amd64:-"JMP" |
| // 386:-"JMP" |
| e = divd % divr |
| d += e |
| } |
| return d, e |
| } |
| |
| // Check that len() and cap() calls divided by powers of two are |
| // optimized into shifts and ands |
| |
| func LenDiv1(a []int) int { |
| // 386:"SHRL\t[$]10" |
| // amd64:"SHRQ\t[$]10" |
| // arm64:"LSR\t[$]10",-"SDIV" |
| // arm:"SRL\t[$]10",-".*udiv" |
| // ppc64:"SRD"\t[$]10" |
| // ppc64le:"SRD"\t[$]10" |
| return len(a) / 1024 |
| } |
| |
| func LenDiv2(s string) int { |
| // 386:"SHRL\t[$]11" |
| // amd64:"SHRQ\t[$]11" |
| // arm64:"LSR\t[$]11",-"SDIV" |
| // arm:"SRL\t[$]11",-".*udiv" |
| // ppc64:"SRD\t[$]11" |
| // ppc64le:"SRD\t[$]11" |
| return len(s) / (4097 >> 1) |
| } |
| |
| func LenMod1(a []int) int { |
| // 386:"ANDL\t[$]1023" |
| // amd64:"ANDL\t[$]1023" |
| // arm64:"AND\t[$]1023",-"SDIV" |
| // arm/6:"AND",-".*udiv" |
| // arm/7:"BFC",-".*udiv",-"AND" |
| // ppc64:"ANDCC\t[$]1023" |
| // ppc64le:"ANDCC\t[$]1023" |
| return len(a) % 1024 |
| } |
| |
| func LenMod2(s string) int { |
| // 386:"ANDL\t[$]2047" |
| // amd64:"ANDL\t[$]2047" |
| // arm64:"AND\t[$]2047",-"SDIV" |
| // arm/6:"AND",-".*udiv" |
| // arm/7:"BFC",-".*udiv",-"AND" |
| // ppc64:"ANDCC\t[$]2047" |
| // ppc64le:"ANDCC\t[$]2047" |
| return len(s) % (4097 >> 1) |
| } |
| |
| func CapDiv(a []int) int { |
| // 386:"SHRL\t[$]12" |
| // amd64:"SHRQ\t[$]12" |
| // arm64:"LSR\t[$]12",-"SDIV" |
| // arm:"SRL\t[$]12",-".*udiv" |
| // ppc64:"SRD\t[$]12" |
| // ppc64le:"SRD\t[$]12" |
| return cap(a) / ((1 << 11) + 2048) |
| } |
| |
| func CapMod(a []int) int { |
| // 386:"ANDL\t[$]4095" |
| // amd64:"ANDL\t[$]4095" |
| // arm64:"AND\t[$]4095",-"SDIV" |
| // arm/6:"AND",-".*udiv" |
| // arm/7:"BFC",-".*udiv",-"AND" |
| // ppc64:"ANDCC\t[$]4095" |
| // ppc64le:"ANDCC\t[$]4095" |
| return cap(a) % ((1 << 11) + 2048) |
| } |
| |
| func AddMul(x int) int { |
| // amd64:"LEAQ\t1" |
| return 2*x + 1 |
| } |
| |
| func MULA(a, b, c uint32) (uint32, uint32, uint32) { |
| // arm:`MULA`,-`MUL\s` |
| // arm64:`MADDW`,-`MULW` |
| r0 := a*b + c |
| // arm:`MULA`,-`MUL\s` |
| // arm64:`MADDW`,-`MULW` |
| r1 := c*79 + a |
| // arm:`ADD`,-`MULA`,-`MUL\s` |
| // arm64:`ADD`,-`MADD`,-`MULW` |
| // ppc64:`ADD`,-`MULLD` |
| // ppc64le:`ADD`,-`MULLD` |
| r2 := b*64 + c |
| return r0, r1, r2 |
| } |
| |
| func MULS(a, b, c uint32) (uint32, uint32, uint32) { |
| // arm/7:`MULS`,-`MUL\s` |
| // arm/6:`SUB`,`MUL\s`,-`MULS` |
| // arm64:`MSUBW`,-`MULW` |
| r0 := c - a*b |
| // arm/7:`MULS`,-`MUL\s` |
| // arm/6:`SUB`,`MUL\s`,-`MULS` |
| // arm64:`MSUBW`,-`MULW` |
| r1 := a - c*79 |
| // arm/7:`SUB`,-`MULS`,-`MUL\s` |
| // arm64:`SUB`,-`MSUBW`,-`MULW` |
| // ppc64:`SUB`,-`MULLD` |
| // ppc64le:`SUB`,-`MULLD` |
| r2 := c - b*64 |
| return r0, r1, r2 |
| } |
| |
| func addSpecial(a, b, c uint32) (uint32, uint32, uint32) { |
| // amd64:`INCL` |
| a++ |
| // amd64:`DECL` |
| b-- |
| // amd64:`SUBL.*-128` |
| c += 128 |
| return a, b, c |
| } |
| |
| // Divide -> shift rules usually require fixup for negative inputs. |
| // If the input is non-negative, make sure the fixup is eliminated. |
| func divInt(v int64) int64 { |
| if v < 0 { |
| return 0 |
| } |
| // amd64:-`.*SARQ.*63,`, -".*SHRQ", ".*SARQ.*[$]9," |
| return v / 512 |
| } |
| |
| // The reassociate rules "x - (z + C) -> (x - z) - C" and |
| // "(z + C) -x -> C + (z - x)" can optimize the following cases. |
| func constantFold1(i0, j0, i1, j1, i2, j2, i3, j3 int) (int, int, int, int) { |
| // arm64:"SUB","ADD\t[$]2" |
| // ppc64:"SUB","ADD\t[$]2" |
| // ppc64le:"SUB","ADD\t[$]2" |
| r0 := (i0 + 3) - (j0 + 1) |
| // arm64:"SUB","SUB\t[$]4" |
| // ppc64:"SUB","ADD\t[$]-4" |
| // ppc64le:"SUB","ADD\t[$]-4" |
| r1 := (i1 - 3) - (j1 + 1) |
| // arm64:"SUB","ADD\t[$]4" |
| // ppc64:"SUB","ADD\t[$]4" |
| // ppc64le:"SUB","ADD\t[$]4" |
| r2 := (i2 + 3) - (j2 - 1) |
| // arm64:"SUB","SUB\t[$]2" |
| // ppc64:"SUB","ADD\t[$]-2" |
| // ppc64le:"SUB","ADD\t[$]-2" |
| r3 := (i3 - 3) - (j3 - 1) |
| return r0, r1, r2, r3 |
| } |
| |
| // The reassociate rules "x - (z + C) -> (x - z) - C" and |
| // "(C - z) - x -> C - (z + x)" can optimize the following cases. |
| func constantFold2(i0, j0, i1, j1 int) (int, int) { |
| // arm64:"ADD","MOVD\t[$]2","SUB" |
| // ppc64le: `SUBC\tR[0-9]+,\s[$]2,\sR` |
| // ppc64: `SUBC\tR[0-9]+,\s[$]2,\sR` |
| r0 := (3 - i0) - (j0 + 1) |
| // arm64:"ADD","MOVD\t[$]4","SUB" |
| // ppc64le: `SUBC\tR[0-9]+,\s[$]4,\sR` |
| // ppc64: `SUBC\tR[0-9]+,\s[$]4,\sR` |
| r1 := (3 - i1) - (j1 - 1) |
| return r0, r1 |
| } |
| |
| func constantFold3(i, j int) int { |
| // arm64: "MOVD\t[$]30","MUL",-"ADD",-"LSL" |
| // ppc64:"MULLD\t[$]30","MULLD" |
| // ppc64le:"MULLD\t[$]30","MULLD" |
| r := (5 * i) * (6 * j) |
| return r |
| } |
