FreeCalypso > hg > freecalypso-tools
annotate target-utils/libc/strlen.S @ 805:a43c5dc251dc
doc/User-phone-tools: new sms-pdu-decode backslash escapes
| author | Mychaela Falconia <falcon@freecalypso.org> |
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| date | Thu, 25 Mar 2021 05:10:43 +0000 |
| parents | 3670e7768ab6 |
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| rev | line source |
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95
3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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1 .text |
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3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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2 .code 32 |
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3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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3 .globl strlen |
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3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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4 strlen: |
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3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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5 mov r1, r0 |
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3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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6 1: ldrb r2, [r0], #1 |
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3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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7 cmn r2, #0 |
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3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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8 bne 1b |
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3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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9 sbc r0, r0, r1 |
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3670e7768ab6
target-utils/libc: strlen optimized assembly implementation added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
10 bx lr |