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Diffstat (limited to 'src/internal/bytealg/compare_s390x.s')
| -rw-r--r-- | src/internal/bytealg/compare_s390x.s | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/internal/bytealg/compare_s390x.s b/src/internal/bytealg/compare_s390x.s new file mode 100644 index 0000000..5394548 --- /dev/null +++ b/src/internal/bytealg/compare_s390x.s @@ -0,0 +1,69 @@ +// 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,$0-56 + MOVD a_base+0(FP), R3 + MOVD a_len+8(FP), R4 + MOVD b_base+24(FP), R5 + MOVD b_len+32(FP), R6 + LA ret+48(FP), R7 + BR cmpbody<>(SB) + +TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40 + MOVD a_base+0(FP), R3 + MOVD a_len+8(FP), R4 + MOVD b_base+16(FP), R5 + MOVD b_len+24(FP), R6 + LA ret+32(FP), R7 + BR cmpbody<>(SB) + +// input: +// R3 = a +// R4 = alen +// R5 = b +// R6 = blen +// R7 = address of output word (stores -1/0/1 here) +TEXT cmpbody<>(SB),NOSPLIT|NOFRAME,$0-0 + CMPBEQ R3, R5, cmplengths + MOVD R4, R8 + CMPBLE R4, R6, amin + MOVD R6, R8 +amin: + CMPBEQ R8, $0, cmplengths + CMP R8, $256 + BLE tail +loop: + CLC $256, 0(R3), 0(R5) + BGT gt + BLT lt + SUB $256, R8 + MOVD $256(R3), R3 + MOVD $256(R5), R5 + CMP R8, $256 + BGT loop +tail: + SUB $1, R8 + EXRL $cmpbodyclc<>(SB), R8 + BGT gt + BLT lt +cmplengths: + CMP R4, R6 + BEQ eq + BLT lt +gt: + MOVD $1, 0(R7) + RET +lt: + MOVD $-1, 0(R7) + RET +eq: + MOVD $0, 0(R7) + RET + +TEXT cmpbodyclc<>(SB),NOSPLIT|NOFRAME,$0-0 + CLC $1, 0(R3), 0(R5) + RET |