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| author | Cherry Mui <cherryyz@google.com> | 2021-06-02 18:00:12 -0400 |
|---|---|---|
| committer | Cherry Mui <cherryyz@google.com> | 2021-06-03 14:29:14 +0000 |
| commit | 5a008a92e84f05e79fbe9fd8ab283bcee95d54ee (patch) | |
| tree | 5c54f8fef3bc46d61e6d8f5f51577c9676be6107 /src/internal/bytealg | |
| parent | 165d39a1d460880f2d28619a4609f272448b0d60 (diff) | |
| download | go-5a008a92e84f05e79fbe9fd8ab283bcee95d54ee.tar.xz | |
[dev.typeparams] internal/bytealg: call memeqbody directly in memequal_varlen on ARM64
Currently, memequal_varlen opens up a frame and call memequal,
which then tail-calls memeqbody. This CL changes memequal_varlen
tail-calls memeqbody directly.
This makes it simpler to switch to the register ABI in the next
CL.
Change-Id: Ia1367c0abb7f4755fe736c404411793fb9e5c04f
Reviewed-on: https://go-review.googlesource.com/c/go/+/324399
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Diffstat (limited to 'src/internal/bytealg')
| -rw-r--r-- | src/internal/bytealg/equal_arm64.s | 21 |
1 files changed, 8 insertions, 13 deletions
diff --git a/src/internal/bytealg/equal_arm64.s b/src/internal/bytealg/equal_arm64.s index 01aa7b7b7a..944edd8768 100644 --- a/src/internal/bytealg/equal_arm64.s +++ b/src/internal/bytealg/equal_arm64.s @@ -20,20 +20,15 @@ equal: RET // memequal_varlen(a, b unsafe.Pointer) bool -TEXT runtime·memequal_varlen(SB),NOSPLIT,$40-17 - MOVD a+0(FP), R3 - MOVD b+8(FP), R4 - CMP R3, R4 +TEXT runtime·memequal_varlen(SB),NOSPLIT,$0-17 + MOVD a+0(FP), R0 + MOVD b+8(FP), R2 + CMP R0, R2 BEQ eq - MOVD 8(R26), R5 // compiler stores size at offset 8 in the closure - CBZ R5, eq - MOVD R3, 8(RSP) - MOVD R4, 16(RSP) - MOVD R5, 24(RSP) - BL runtime·memequal(SB) - MOVBU 32(RSP), R3 - MOVB R3, ret+16(FP) - RET + MOVD 8(R26), R1 // compiler stores size at offset 8 in the closure + CBZ R1, eq + MOVD $ret+16(FP), R8 + B memeqbody<>(SB) eq: MOVD $1, R3 MOVB R3, ret+16(FP) |