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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" TEXT ·Compare(SB),NOSPLIT|NOFRAME,$0-28 MOVW a_base+0(FP), R2 MOVW a_len+4(FP), R0 MOVW b_base+12(FP), R3 MOVW b_len+16(FP), R1 ADD $28, R13, R7 B cmpbody<>(SB) TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-20 MOVW a_base+0(FP), R2 MOVW a_len+4(FP), R0 MOVW b_base+8(FP), R3 MOVW b_len+12(FP), R1 ADD $20, R13, R7 B cmpbody<>(SB) // On entry: // R0 is the length of a // R1 is the length of b // R2 points to the start of a // R3 points to the start of b // R7 points to return value (-1/0/1 will be written here) // // On exit: // R4, R5, R6 and R8 are clobbered TEXT cmpbody<>(SB),NOSPLIT|NOFRAME,$0-0 CMP R2, R3 BEQ samebytes CMP R0, R1 MOVW R0, R6 MOVW.LT R1, R6 // R6 is min(R0, R1) CMP $0, R6 BEQ samebytes CMP $4, R6 ADD R2, R6 // R2 is current byte in a, R6 is the end of the range to compare BLT byte_loop // length < 4 AND $3, R2, R8 CMP $0, R8 BNE byte_loop // unaligned a, use byte-wise compare (TODO: try to align a) aligned_a: AND $3, R3, R8 CMP $0, R8 BNE byte_loop // unaligned b, use byte-wise compare AND $0xfffffffc, R6, R8 // length >= 4 chunk4_loop: MOVW.P 4(R2), R4 MOVW.P 4(R3), R5 CMP R4, R5 BNE cmp CMP R2, R8 BNE chunk4_loop CMP R2, R6 BEQ samebytes // all compared bytes were the same; compare lengths byte_loop: MOVBU.P 1(R2), R4 MOVBU.P 1(R3), R5 CMP R4, R5 BNE ret CMP R2, R6 BNE byte_loop samebytes: CMP R0, R1 MOVW.LT $1, R0 MOVW.GT $-1, R0 MOVW.EQ $0, R0 MOVW R0, (R7) RET ret: // bytes differed MOVW.LT $1, R0 MOVW.GT $-1, R0 MOVW R0, (R7) RET cmp: SUB $4, R2, R2 SUB $4, R3, R3 B byte_loop