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Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
753 bytes
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| Line | |
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| 1 | .file "strncmp.S" |
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| 2 | |
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| 3 | .section .text |
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| 4 | .global _strncmp |
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| 5 | .type _strncmp,@function |
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| 6 | _strncmp: |
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| 7 | ;; R1: string1 |
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| 8 | ;; R2: string2 |
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| 9 | ;; R3: max number of bytes to compare |
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| 10 | #ifdef __RX_DISALLOW_STRING_INSNS__ |
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| 11 | cmp #0, r3 ; For a length of zero, return zero |
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| 12 | beq 4f |
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| 13 | |
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| 14 | 2: mov.b [r1+], r4 |
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| 15 | mov.b [r2+], r5 |
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| 16 | cmp #0, r4 |
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| 17 | beq 3f |
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| 18 | cmp #0, r5 |
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| 19 | beq 3f |
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| 20 | sub #1, r3 |
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| 21 | beq 3f |
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| 22 | cmp r4, r5 |
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| 23 | beq 2b |
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| 24 | |
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| 25 | 3: and #0xff, r4 ; We need to perform an unsigned comparison of the bytes. |
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| 26 | and #0xff, r5 |
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| 27 | sub r5, r4, r1 |
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| 28 | rts |
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| 29 | |
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| 30 | 4: mov #0, r1 |
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| 31 | rts |
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| 32 | #else |
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| 33 | scmpu ; Perform the string comparison |
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| 34 | bnc 1f ; If Carry is not set skip over |
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| 35 | scne.L r1 ; Set result based on Z flag |
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| 36 | rts ; |
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| 37 | 1: ; |
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| 38 | mov #-1,r1 ; Carry not set, result should be negative |
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| 39 | rts ; |
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| 40 | #endif |
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| 41 | .size _strncmp, . - _strncmp |
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