FreeCalypso > hg > freecalypso-tools
annotate target-utils/libc/memcmp.S @ 208:4022bfbaafd4
INSTALL: cosmetic fix in bullet point numbering
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 18 May 2017 07:24:07 +0000 |
parents | a675cec34076 |
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rev | line source |
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a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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1 .text |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
2 .code 32 |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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3 .globl bcmp |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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4 .globl memcmp |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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5 bcmp: |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
6 memcmp: |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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7 cmp r2, #0 |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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8 beq zero_len_out |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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9 mov r3, r0 |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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10 1: ldrb r0, [r3], #1 |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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11 ldrb r12, [r1], #1 |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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12 subs r0, r0, r12 |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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13 bxne lr |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
14 subs r2, r2, #1 |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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15 bne 1b |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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16 bx lr |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
17 |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
18 zero_len_out: |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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19 mov r0, #0 |
a675cec34076
target-utils/libc: assembly implementation of bcmp/memcmp
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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20 bx lr |