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| author | Paul Mundt <lethal@linux-sh.org> | 2008-12-12 10:34:44 +0300 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-12-22 12:44:05 +0300 |
| commit | 4466b20cfcfa718ff515b9e3886749cc025e2005 (patch) | |
| tree | f12402e006de74df252dff03d455af0a9e2bfa0b /arch/sh/lib64/memset.S | |
| parent | 776d6c298aad42c2b8f191fa9ad826075e4d588c (diff) | |
| download | linux-4466b20cfcfa718ff515b9e3886749cc025e2005.tar.xz | |
sh: Add SH-5 optimized memcpy()/memset()/strcpy()/strlen().
Adopted from the uClibc optimized string versions.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/lib64/memset.S')
| -rw-r--r-- | arch/sh/lib64/memset.S | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/arch/sh/lib64/memset.S b/arch/sh/lib64/memset.S new file mode 100644 index 000000000000..2d37b0488552 --- /dev/null +++ b/arch/sh/lib64/memset.S @@ -0,0 +1,91 @@ +/* Cloned and hacked for uClibc by Paul Mundt, December 2003 */ +/* Modified by SuperH, Inc. September 2003 */ +! +! Fast SH memset +! +! by Toshiyasu Morita (tm@netcom.com) +! +! SH5 code by J"orn Rennecke (joern.rennecke@superh.com) +! Copyright 2002 SuperH Ltd. +! + +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define SHHI shlld +#define SHLO shlrd +#else +#define SHHI shlrd +#define SHLO shlld +#endif + + .section .text..SHmedia32,"ax" + .globl memset + .type memset, @function + + .align 5 + +memset: + pta/l multiquad, tr0 + andi r2, 7, r22 + ptabs r18, tr2 + mshflo.b r3,r3,r3 + add r4, r22, r23 + mperm.w r3, r63, r3 // Fill pattern now in every byte of r3 + + movi 8, r9 + bgtu/u r23, r9, tr0 // multiquad + + beqi/u r4, 0, tr2 // Return with size 0 - ensures no mem accesses + ldlo.q r2, 0, r7 + shlli r4, 2, r4 + movi -1, r8 + SHHI r8, r4, r8 + SHHI r8, r4, r8 + mcmv r7, r8, r3 + stlo.q r2, 0, r3 + blink tr2, r63 + +multiquad: + pta/l lastquad, tr0 + stlo.q r2, 0, r3 + shlri r23, 3, r24 + add r2, r4, r5 + beqi/u r24, 1, tr0 // lastquad + pta/l loop, tr1 + sub r2, r22, r25 + andi r5, -8, r20 // calculate end address and + addi r20, -7*8, r8 // loop end address; This might overflow, so we need + // to use a different test before we start the loop + bge/u r24, r9, tr1 // loop + st.q r25, 8, r3 + st.q r20, -8, r3 + shlri r24, 1, r24 + beqi/u r24, 1, tr0 // lastquad + st.q r25, 16, r3 + st.q r20, -16, r3 + beqi/u r24, 2, tr0 // lastquad + st.q r25, 24, r3 + st.q r20, -24, r3 +lastquad: + sthi.q r5, -1, r3 + blink tr2,r63 + +loop: +!!! alloco r25, 32 // QQQ comment out for short-term fix to SHUK #3895. + // QQQ commenting out is locically correct, but sub-optimal + // QQQ Sean McGoogan - 4th April 2003. + st.q r25, 8, r3 + st.q r25, 16, r3 + st.q r25, 24, r3 + st.q r25, 32, r3 + addi r25, 32, r25 + bgeu/l r8, r25, tr1 // loop + + st.q r20, -40, r3 + st.q r20, -32, r3 + st.q r20, -24, r3 + st.q r20, -16, r3 + st.q r20, -8, r3 + sthi.q r5, -1, r3 + blink tr2,r63 + + .size memset,.-memset |