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Change-Id: I22eb4e7444e5fe5f6767cc960895f3c6e2fa13cc Reviewed-on: https://go-review.googlesource.com/c/go/+/661615 Reviewed-by: Keith Randall <khr@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@golang.org> Auto-Submit: Carlos Amedee <carlos@golang.org> Reviewed-by: Carlos Amedee <carlos@golang.org>
36 lines
701 B
ArmAsm
36 lines
701 B
ArmAsm
// Copyright 2020 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 ·CountString<ABIInternal>(SB),NOSPLIT,$0-32
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// X10 = s_base
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// X11 = s_len
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// X12 = byte to count
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MOV X12, X13
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JMP ·Count<ABIInternal>(SB)
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TEXT ·Count<ABIInternal>(SB),NOSPLIT,$0-40
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// X10 = b_base
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// X11 = b_len
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// X12 = b_cap (unused)
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// X13 = byte to count (want in X12)
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AND $0xff, X13, X12
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MOV ZERO, X14 // count
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ADD X10, X11 // end
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PCALIGN $16
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loop:
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BEQ X10, X11, done
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MOVBU (X10), X15
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ADD $1, X10
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BNE X12, X15, loop
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ADD $1, X14
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JMP loop
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done:
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MOV X14, X10
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RET
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