1/* Cloned and hacked for uClibc by Paul Mundt, December 2003 */ 2/* Modified by SuperH, Inc. September 2003 */ 3! 4! Fast SH memset 5! 6! by Toshiyasu Morita (tm@netcom.com) 7! 8! SH5 code by J"orn Rennecke (joern.rennecke@superh.com) 9! Copyright 2002 SuperH Ltd. 10! 11 12#if __BYTE_ORDER == __LITTLE_ENDIAN 13#define SHHI shlld 14#define SHLO shlrd 15#else 16#define SHHI shlrd 17#define SHLO shlld 18#endif 19 20 .section .text..SHmedia32,"ax" 21 .globl memset 22 .type memset, @function 23 24 .align 5 25 26memset: 27 pta/l multiquad, tr0 28 andi r2, 7, r22 29 ptabs r18, tr2 30 mshflo.b r3,r3,r3 31 add r4, r22, r23 32 mperm.w r3, r63, r3 // Fill pattern now in every byte of r3 33 34 movi 8, r9 35 bgtu/u r23, r9, tr0 // multiquad 36 37 beqi/u r4, 0, tr2 // Return with size 0 - ensures no mem accesses 38 ldlo.q r2, 0, r7 39 shlli r4, 2, r4 40 movi -1, r8 41 SHHI r8, r4, r8 42 SHHI r8, r4, r8 43 mcmv r7, r8, r3 44 stlo.q r2, 0, r3 45 blink tr2, r63 46 47multiquad: 48 pta/l lastquad, tr0 49 stlo.q r2, 0, r3 50 shlri r23, 3, r24 51 add r2, r4, r5 52 beqi/u r24, 1, tr0 // lastquad 53 pta/l loop, tr1 54 sub r2, r22, r25 55 andi r5, -8, r20 // calculate end address and 56 addi r20, -7*8, r8 // loop end address; This might overflow, so we need 57 // to use a different test before we start the loop 58 bge/u r24, r9, tr1 // loop 59 st.q r25, 8, r3 60 st.q r20, -8, r3 61 shlri r24, 1, r24 62 beqi/u r24, 1, tr0 // lastquad 63 st.q r25, 16, r3 64 st.q r20, -16, r3 65 beqi/u r24, 2, tr0 // lastquad 66 st.q r25, 24, r3 67 st.q r20, -24, r3 68lastquad: 69 sthi.q r5, -1, r3 70 blink tr2,r63 71 72loop: 73!!! alloco r25, 32 // QQQ comment out for short-term fix to SHUK #3895. 74 // QQQ commenting out is locically correct, but sub-optimal 75 // QQQ Sean McGoogan - 4th April 2003. 76 st.q r25, 8, r3 77 st.q r25, 16, r3 78 st.q r25, 24, r3 79 st.q r25, 32, r3 80 addi r25, 32, r25 81 bgeu/l r8, r25, tr1 // loop 82 83 st.q r20, -40, r3 84 st.q r20, -32, r3 85 st.q r20, -24, r3 86 st.q r20, -16, r3 87 st.q r20, -8, r3 88 sthi.q r5, -1, r3 89 blink tr2,r63 90 91 .size memset,.-memset 92