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// Copyright 2019 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. //go:build mips64 || mips64le #include "go_asm.h" #include "textflag.h" TEXT ·Compare(SB),NOSPLIT,$0-56 MOVV a_base+0(FP), R3 MOVV b_base+24(FP), R4 MOVV a_len+8(FP), R1 MOVV b_len+32(FP), R2 MOVV $ret+48(FP), R9 JMP cmpbody<>(SB) TEXT runtime·cmpstring(SB),NOSPLIT,$0-40 MOVV a_base+0(FP), R3 MOVV b_base+16(FP), R4 MOVV a_len+8(FP), R1 MOVV b_len+24(FP), R2 MOVV $ret+32(FP), R9 JMP cmpbody<>(SB) // On entry: // R1 length of a // R2 length of b // R3 points to the start of a // R4 points to the start of b // R9 points to the return value (-1/0/1) TEXT cmpbody<>(SB),NOSPLIT|NOFRAME,$0 BEQ R3, R4, samebytes // same start of a and b SGTU R1, R2, R7 BNE R0, R7, r2_lt_r1 MOVV R1, R10 JMP entry r2_lt_r1: MOVV R2, R10 // R10 is min(R1, R2) entry: ADDV R3, R10, R8 // R3 start of a, R8 end of a BEQ R3, R8, samebytes // length is 0 SRLV $4, R10 // R10 is number of chunks BEQ R0, R10, byte_loop // make sure both a and b are aligned. OR R3, R4, R11 AND $7, R11 BNE R0, R11, byte_loop chunk16_loop: BEQ R0, R10, byte_loop MOVV (R3), R6 MOVV (R4), R7 BNE R6, R7, byte_loop MOVV 8(R3), R13 MOVV 8(R4), R14 ADDV $16, R3 ADDV $16, R4 SUBVU $1, R10 BEQ R13, R14, chunk16_loop SUBV $8, R3 SUBV $8, R4 byte_loop: BEQ R3, R8, samebytes MOVBU (R3), R6 ADDVU $1, R3 MOVBU (R4), R7 ADDVU $1, R4 BEQ R6, R7, byte_loop byte_cmp: SGTU R6, R7, R8 // R8 = 1 if (R6 > R7) BNE R0, R8, ret MOVV $-1, R8 JMP ret samebytes: SGTU R1, R2, R6 SGTU R2, R1, R7 SUBV R7, R6, R8 ret: MOVV R8, (R9) RET