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Diffstat (limited to 'src/internal/bytealg/equal_s390x.s')
| -rw-r--r-- | src/internal/bytealg/equal_s390x.s | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/internal/bytealg/equal_s390x.s b/src/internal/bytealg/equal_s390x.s new file mode 100644 index 0000000..67f814d --- /dev/null +++ b/src/internal/bytealg/equal_s390x.s @@ -0,0 +1,92 @@ +// 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,$0-25 + MOVD a+0(FP), R3 + MOVD b+8(FP), R5 + MOVD size+16(FP), R6 + LA ret+24(FP), R7 + BR memeqbody<>(SB) + +// memequal_varlen(a, b unsafe.Pointer) bool +TEXT runtime·memequal_varlen(SB),NOSPLIT|NOFRAME,$0-17 + MOVD a+0(FP), R3 + MOVD b+8(FP), R5 + MOVD 8(R12), R6 // compiler stores size at offset 8 in the closure + LA ret+16(FP), R7 + BR memeqbody<>(SB) + +// input: +// R3 = a +// R5 = b +// R6 = len +// R7 = address of output byte (stores 0 or 1 here) +// a and b have the same length +TEXT memeqbody<>(SB),NOSPLIT|NOFRAME,$0-0 + CMPBEQ R3, R5, equal +loop: + CMPBEQ R6, $0, equal + CMPBLT R6, $32, tiny + CMP R6, $256 + BLT tail + CLC $256, 0(R3), 0(R5) + BNE notequal + SUB $256, R6 + LA 256(R3), R3 + LA 256(R5), R5 + BR loop +tail: + SUB $1, R6, R8 + EXRL $memeqbodyclc<>(SB), R8 + BEQ equal +notequal: + MOVB $0, 0(R7) + RET +equal: + MOVB $1, 0(R7) + RET +tiny: + MOVD $0, R2 + CMPBLT R6, $16, lt16 + MOVD 0(R3), R8 + MOVD 0(R5), R9 + CMPBNE R8, R9, notequal + MOVD 8(R3), R8 + MOVD 8(R5), R9 + CMPBNE R8, R9, notequal + LA 16(R2), R2 + SUB $16, R6 +lt16: + CMPBLT R6, $8, lt8 + MOVD 0(R3)(R2*1), R8 + MOVD 0(R5)(R2*1), R9 + CMPBNE R8, R9, notequal + LA 8(R2), R2 + SUB $8, R6 +lt8: + CMPBLT R6, $4, lt4 + MOVWZ 0(R3)(R2*1), R8 + MOVWZ 0(R5)(R2*1), R9 + CMPBNE R8, R9, notequal + LA 4(R2), R2 + SUB $4, R6 +lt4: +#define CHECK(n) \ + CMPBEQ R6, $n, equal \ + MOVB n(R3)(R2*1), R8 \ + MOVB n(R5)(R2*1), R9 \ + CMPBNE R8, R9, notequal + CHECK(0) + CHECK(1) + CHECK(2) + CHECK(3) + BR equal + +TEXT memeqbodyclc<>(SB),NOSPLIT|NOFRAME,$0-0 + CLC $1, 0(R3), 0(R5) + RET |