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https://github.com/refraction-networking/utls.git
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effdebcc99
Coalesce set/get pairs into a tee. Change-Id: I88ccdcb148465615437bebf24145e941a037e0a5 Reviewed-on: https://go-review.googlesource.com/c/go/+/200357 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Richard Musiol <neelance@gmail.com> Reviewed-by: Cherry Zhang <cherryyz@google.com>
115 lines
1.4 KiB
ArmAsm
115 lines
1.4 KiB
ArmAsm
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "go_asm.h"
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#include "textflag.h"
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TEXT ·Compare(SB), NOSPLIT, $0-56
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Get SP
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I64Load a_base+0(FP)
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I64Load a_len+8(FP)
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I64Load b_base+24(FP)
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I64Load b_len+32(FP)
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Call cmpbody<>(SB)
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I64Store ret+48(FP)
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RET
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TEXT runtime·cmpstring(SB), NOSPLIT, $0-40
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Get SP
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I64Load a_base+0(FP)
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I64Load a_len+8(FP)
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I64Load b_base+16(FP)
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I64Load b_len+24(FP)
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Call cmpbody<>(SB)
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I64Store ret+32(FP)
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RET
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// params: a, alen, b, blen
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// ret: -1/0/1
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TEXT cmpbody<>(SB), NOSPLIT, $0-0
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// len = min(alen, blen)
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Get R1
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Get R3
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Get R1
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Get R3
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I64LtU
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Select
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Set R4
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Get R0
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I32WrapI64
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Get R2
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I32WrapI64
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Get R4
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I32WrapI64
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Call memcmp<>(SB)
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I64ExtendI32S
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Tee R5
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I64Eqz
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If
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// check length
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Get R1
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Get R3
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I64Sub
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Set R5
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End
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I64Const $0
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I64Const $-1
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I64Const $1
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Get R5
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I64Const $0
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I64LtS
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Select
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Get R5
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I64Eqz
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Select
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Return
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// compiled with emscripten
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// params: a, b, len
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// ret: <0/0/>0
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TEXT memcmp<>(SB), NOSPLIT, $0-0
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Get R2
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If $1
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Loop
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Get R0
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I32Load8S $0
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Tee R3
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Get R1
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I32Load8S $0
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Tee R4
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I32Eq
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If
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Get R0
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I32Const $1
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I32Add
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Set R0
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Get R1
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I32Const $1
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I32Add
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Set R1
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I32Const $0
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Get R2
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I32Const $-1
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I32Add
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Tee R2
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I32Eqz
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BrIf $3
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Drop
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Br $1
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End
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End
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Get R3
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I32Const $255
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I32And
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Get R4
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I32Const $255
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I32And
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I32Sub
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Else
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I32Const $0
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End
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Return
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