| /* 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 |