diff options
| -rw-r--r-- | libc/string/arm/strlen.S | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/libc/string/arm/strlen.S b/libc/string/arm/strlen.S index a84114c31..65ee94d99 100644 --- a/libc/string/arm/strlen.S +++ b/libc/string/arm/strlen.S @@ -59,12 +59,21 @@ Laligned: @ here, we have a word in r2. Does it ldrne r2, [r1], $4 @ and we continue to the next word bne Laligned @ Llastword: @ drop through to here once we find a - tst r2, $0x000000ff @ word that has a zero byte in it +#if __BYTE_ORDER == __BIG_ENDIAN + tst r2, $0xff000000 @ word that has a zero byte in it + addne r0, r0, $1 @ + tstne r2, $0x00ff0000 @ and add up to 3 bytes on to it + addne r0, r0, $1 @ + tstne r2, $0x0000ff00 @ (if first three all non-zero, 4th + addne r0, r0, $1 @ must be zero) +#else + tst r2, $0x000000ff @ addne r0, r0, $1 @ tstne r2, $0x0000ff00 @ and add up to 3 bytes on to it addne r0, r0, $1 @ tstne r2, $0x00ff0000 @ (if first three all non-zero, 4th addne r0, r0, $1 @ must be zero) +#endif mov pc,lr .size strlen,.-strlen; |