blob: fa82589644512a8f106b381af24fd5f6abbe80e1 [file] [log] [blame]
// 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.
#include "go_asm.h"
#include "textflag.h"
TEXT ·Equal(SB),NOSPLIT,$0-49
MOVQ a_len+8(FP), BX
MOVQ b_len+32(FP), CX
CMPQ BX, CX
JNE neq
MOVQ a_base+0(FP), SI
MOVQ b_base+24(FP), DI
CMPQ SI, DI
JEQ eq
LEAQ ret+48(FP), AX
JMP memeqbody<>(SB)
neq:
MOVB $0, ret+48(FP)
RET
eq:
MOVB $1, ret+48(FP)
RET
// memequal(a, b unsafe.Pointer, size uintptr) bool
TEXT runtime·memequal(SB),NOSPLIT,$0-25
MOVQ a+0(FP), SI
MOVQ b+8(FP), DI
CMPQ SI, DI
JEQ eq
MOVQ size+16(FP), BX
LEAQ ret+24(FP), AX
JMP memeqbody<>(SB)
eq:
MOVB $1, ret+24(FP)
RET
// memequal_varlen(a, b unsafe.Pointer) bool
TEXT runtime·memequal_varlen(SB),NOSPLIT,$0-17
MOVQ a+0(FP), SI
MOVQ b+8(FP), DI
CMPQ SI, DI
JEQ eq
MOVQ 8(DX), BX // compiler stores size at offset 8 in the closure
LEAQ ret+16(FP), AX
JMP memeqbody<>(SB)
eq:
MOVB $1, ret+16(FP)
RET
// a in SI
// b in DI
// count in BX
// address of result byte in AX
TEXT memeqbody<>(SB),NOSPLIT,$0-0
CMPQ BX, $8
JB small
CMPQ BX, $64
JB bigloop
CMPB internal∕cpu·X86+const_offsetX86HasAVX2(SB), $1
JE hugeloop_avx2
// 64 bytes at a time using xmm registers
hugeloop:
CMPQ BX, $64
JB bigloop
MOVOU (SI), X0
MOVOU (DI), X1
MOVOU 16(SI), X2
MOVOU 16(DI), X3
MOVOU 32(SI), X4
MOVOU 32(DI), X5
MOVOU 48(SI), X6
MOVOU 48(DI), X7
PCMPEQB X1, X0
PCMPEQB X3, X2
PCMPEQB X5, X4
PCMPEQB X7, X6
PAND X2, X0
PAND X6, X4
PAND X4, X0
PMOVMSKB X0, DX
ADDQ $64, SI
ADDQ $64, DI
SUBQ $64, BX
CMPL DX, $0xffff
JEQ hugeloop
MOVB $0, (AX)
RET
// 64 bytes at a time using ymm registers
hugeloop_avx2:
CMPQ BX, $64
JB bigloop_avx2
VMOVDQU (SI), Y0
VMOVDQU (DI), Y1
VMOVDQU 32(SI), Y2
VMOVDQU 32(DI), Y3
VPCMPEQB Y1, Y0, Y4
VPCMPEQB Y2, Y3, Y5
VPAND Y4, Y5, Y6
VPMOVMSKB Y6, DX
ADDQ $64, SI
ADDQ $64, DI
SUBQ $64, BX
CMPL DX, $0xffffffff
JEQ hugeloop_avx2
VZEROUPPER
MOVB $0, (AX)
RET
bigloop_avx2:
VZEROUPPER
// 8 bytes at a time using 64-bit register
bigloop:
CMPQ BX, $8
JBE leftover
MOVQ (SI), CX
MOVQ (DI), DX
ADDQ $8, SI
ADDQ $8, DI
SUBQ $8, BX
CMPQ CX, DX
JEQ bigloop
MOVB $0, (AX)
RET
// remaining 0-8 bytes
leftover:
MOVQ -8(SI)(BX*1), CX
MOVQ -8(DI)(BX*1), DX
CMPQ CX, DX
SETEQ (AX)
RET
small:
CMPQ BX, $0
JEQ equal
LEAQ 0(BX*8), CX
NEGQ CX
CMPB SI, $0xf8
JA si_high
// load at SI won't cross a page boundary.
MOVQ (SI), SI
JMP si_finish
si_high:
// address ends in 11111xxx. Load up to bytes we want, move to correct position.
MOVQ -8(SI)(BX*1), SI
SHRQ CX, SI
si_finish:
// same for DI.
CMPB DI, $0xf8
JA di_high
MOVQ (DI), DI
JMP di_finish
di_high:
MOVQ -8(DI)(BX*1), DI
SHRQ CX, DI
di_finish:
SUBQ SI, DI
SHLQ CX, DI
equal:
SETEQ (AX)
RET