diff options
| author | Eric Andersen <andersen@codepoet.org> | 2003-12-17 07:57:32 +0000 |
|---|---|---|
| committer | Eric Andersen <andersen@codepoet.org> | 2003-12-17 07:57:32 +0000 |
| commit | e2ec80efb27158e6a367238227ddca876054ae9e (patch) | |
| tree | 5a44feeb563f8660e44526d18dbc8b62c37fa4f1 /libc/string/sh64/strcpy.S | |
| parent | f3651e4e206598a4d39dbdab76d4c066ab646188 (diff) | |
Patch from Paul Mundt <lethal@linux-sh.org>:
The subject says it all.. optimized memset/memcpy/strcpy, lifted from SuperH's
glibc tree.
Diffstat (limited to 'libc/string/sh64/strcpy.S')
| -rw-r--r-- | libc/string/sh64/strcpy.S | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/libc/string/sh64/strcpy.S b/libc/string/sh64/strcpy.S new file mode 100644 index 000000000..273e9147c --- /dev/null +++ b/libc/string/sh64/strcpy.S @@ -0,0 +1,98 @@ +/* Cloned and hacked for uClibc by Paul Mundt, December 2003 */ +/* Modified by SuperH, Inc. September 2003 */ +! Entry: arg0: destination +! arg1: source +! Exit: result: destination +! +! SH5 code Copyright 2002 SuperH Ltd. + +#ifdef __LITTLE_ENDIAN__ +#define SHHI shlld +#define SHLO shlrd +#else +#define SHHI shlrd +#define SHLO shlld +#endif + + .section .text..SHmedia32,"ax" + .globl strcpy + .type strcpy, @function + + .align 5 +strcpy: + + pta/l shortstring,tr1 + ldlo.q r3,0,r4 + ptabs r18,tr4 + shlli r3,3,r7 + addi r2, 8, r0 + mcmpeq.b r4,r63,r6 + SHHI r6,r7,r6 + bnei/u r6,0,tr1 // shortstring + pta/l no_lddst, tr2 + ori r3,-8,r23 + sub r2, r23, r0 + sub r3, r2, r21 + addi r21, 8, r20 + ldx.q r0, r21, r5 + pta/l loop, tr0 + ori r2,-8,r22 + mcmpeq.b r5, r63, r6 + bgt/u r22, r23, tr2 // no_lddst + + // r22 < r23 : Need to do a load from the destination. + // r22 == r23 : Doesn't actually need to load from destination, + // but still can be handled here. + ldlo.q r2, 0, r9 + movi -1, r8 + SHLO r8, r7, r8 + mcmv r4, r8, r9 + stlo.q r2, 0, r9 + beqi/l r6, 0, tr0 // loop + + add r5, r63, r4 + addi r0, 8, r0 + blink tr1, r63 // shortstring +no_lddst: + // r22 > r23: note that for r22 == r23 the sthi.q would clobber + // bytes before the destination region. + stlo.q r2, 0, r4 + SHHI r4, r7, r4 + sthi.q r0, -1, r4 + beqi/l r6, 0, tr0 // loop + + add r5, r63, r4 + addi r0, 8, r0 +shortstring: +#ifndef __LITTLE_ENDIAN__ + pta/l shortstring2,tr1 + byterev r4,r4 +#endif +shortstring2: + st.b r0,-8,r4 + andi r4,0xff,r5 + shlri r4,8,r4 + addi r0,1,r0 + bnei/l r5,0,tr1 + blink tr4,r63 // return + + .balign 8 +loop: + stlo.q r0, 0, r5 + ldx.q r0, r20, r4 + addi r0, 16, r0 + sthi.q r0, -9, r5 + mcmpeq.b r4, r63, r6 + bnei/u r6, 0, tr1 // shortstring + ldx.q r0, r21, r5 + stlo.q r0, -8, r4 + sthi.q r0, -1, r4 + mcmpeq.b r5, r63, r6 + beqi/l r6, 0, tr0 // loop + + add r5, r63, r4 + addi r0, 8, r0 + blink tr1, r63 // shortstring + + .size strcpy, . - strcpy + |