/* 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