diff options
Diffstat (limited to 'libc/string/arm/memset.S')
| -rw-r--r-- | libc/string/arm/memset.S | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/libc/string/arm/memset.S b/libc/string/arm/memset.S index 16bfe0dc5..66aa6039c 100644 --- a/libc/string/arm/memset.S +++ b/libc/string/arm/memset.S @@ -19,12 +19,52 @@ #include <features.h> #include <sys/syscall.h> +#include <bits/arm_asm.h> .text .global memset .type memset,%function .align 4 +#if defined(THUMB1_ONLY) +.thumb_func +memset: + mov ip, r0 + cmp r2, #8 @ at least 8 bytes to do? + bcc 2f + + lsl r3, r1, #8 + orr r1, r3 + lsl r3, r1, #16 + orr r1, r3 + + mov r3, #3 +1: @ Fill up to the first word boundary + tst r0, r3 + beq 1f + strb r1, [r0] + add r0, r0, #1 + sub r2, r2, #1 + b 1b +1: @ Fill aligned words + str r1, [r0] + add r0, r0, #4 + sub r2, r2, #4 + cmp r2, #4 + bcs 1b + +2: @ Fill the remaining bytes + cmp r2, #0 + beq 2f +1: + strb r1, [r0] + add r0, r0, #1 + sub r2, r2, #1 + bne 1b +2: + mov r0, ip + bx lr +#else memset: mov a4, a1 cmp a3, $8 @ at least 8 bytes to do? @@ -33,8 +73,14 @@ memset: orr a2, a2, a2, lsl $16 1: tst a4, $3 @ aligned yet? +#if defined(__thumb2__) + itt ne + strbne a2, [a4], $1 + subne a3, a3, $1 +#else strneb a2, [a4], $1 subne a3, a3, $1 +#endif bne 1b mov ip, a2 1: @@ -51,16 +97,30 @@ memset: stmia a4!, {a2, ip} sub a3, a3, $8 cmp a3, $8 @ 8 bytes still to do? +#if defined(__thumb2__) + itt ge + stmiage a4!, {a2, ip} + subge a3, a3, $8 +#else stmgeia a4!, {a2, ip} subge a3, a3, $8 +#endif bge 1b 2: movs a3, a3 @ anything left? + IT(t, eq) #if defined(__USE_BX__) bxeq lr #else moveq pc, lr @ nope #endif +#if defined (__thumb2__) +1: + strb a2, [a4], #1 + subs a3, a3, #1 + bne 1b + bx lr +#else rsb a3, a3, $7 add pc, pc, a3, lsl $2 mov r0, r0 @@ -76,6 +136,8 @@ memset: #else mov pc, lr #endif +#endif +#endif .size memset,.-memset |