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// 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" // memequal(a, b unsafe.Pointer, size uintptr) bool TEXT runtime·memequal(SB),NOSPLIT|NOFRAME,$0-13 MOVW a+0(FP), R0 MOVW b+4(FP), R2 CMP R0, R2 B.EQ eq MOVW size+8(FP), R1 CMP $0, R1 B.EQ eq // short path to handle 0-byte case MOVW $ret+12(FP), R7 B memeqbody<>(SB) eq: MOVW $1, R0 MOVB R0, ret+12(FP) RET // memequal_varlen(a, b unsafe.Pointer) bool TEXT runtime·memequal_varlen(SB),NOSPLIT|NOFRAME,$0-9 MOVW a+0(FP), R0 MOVW b+4(FP), R2 CMP R0, R2 B.EQ eq MOVW 4(R7), R1 // compiler stores size at offset 4 in the closure CMP $0, R1 B.EQ eq // short path to handle 0-byte case MOVW $ret+8(FP), R7 B memeqbody<>(SB) eq: MOVW $1, R0 MOVB R0, ret+8(FP) RET // Input: // R0: data of a // R1: length // R2: data of b // R7: points to return value // // On exit: // R4, R5 and R6 are clobbered TEXT memeqbody<>(SB),NOSPLIT|NOFRAME,$0-0 CMP $1, R1 B.EQ one // 1-byte special case for better performance CMP $4, R1 ADD R0, R1 // R1 is the end of the range to compare B.LT byte_loop // length < 4 AND $3, R0, R6 CMP $0, R6 B.NE byte_loop // unaligned a, use byte-wise compare (TODO: try to align a) AND $3, R2, R6 CMP $0, R6 B.NE byte_loop // unaligned b, use byte-wise compare AND $0xfffffffc, R1, R6 // length >= 4 chunk4_loop: MOVW.P 4(R0), R4 MOVW.P 4(R2), R5 CMP R4, R5 B.NE notequal CMP R0, R6 B.NE chunk4_loop CMP R0, R1 B.EQ equal // reached the end byte_loop: MOVBU.P 1(R0), R4 MOVBU.P 1(R2), R5 CMP R4, R5 B.NE notequal CMP R0, R1 B.NE byte_loop equal: MOVW $1, R0 MOVB R0, (R7) RET one: MOVBU (R0), R4 MOVBU (R2), R5 CMP R4, R5 B.EQ equal notequal: MOVW $0, R0 MOVB R0, (R7) RET