projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 4466b20c PM |
2 | /* Cloned and hacked for uClibc by Paul Mundt, December 2003 */ |
| 3 | /* Modified by SuperH, Inc. September 2003 */ | |
| 4 | ! | |
| 5 | ! Fast SH memset | |
| 6 | ! | |
| 7 | ! by Toshiyasu Morita ([email protected]) | |
| 8 | ! | |
| 9 | ! SH5 code by J"orn Rennecke ([email protected]) | |
| 10 | ! Copyright 2002 SuperH Ltd. | |
| 11 | ! | |
| 12 | ||
| 13 | #if __BYTE_ORDER == __LITTLE_ENDIAN | |
| 14 | #define SHHI shlld | |
| 15 | #define SHLO shlrd | |
| 16 | #else | |
| 17 | #define SHHI shlrd | |
| 18 | #define SHLO shlld | |
| 19 | #endif | |
| 20 | ||
| 21 | .section .text..SHmedia32,"ax" | |
| 22 | .globl memset | |
| 23 | .type memset, @function | |
| 24 | ||
| 25 | .align 5 | |
| 26 | ||
| 27 | memset: | |
| 28 | pta/l multiquad, tr0 | |
| 29 | andi r2, 7, r22 | |
| 30 | ptabs r18, tr2 | |
| 31 | mshflo.b r3,r3,r3 | |
| 32 | add r4, r22, r23 | |
| 33 | mperm.w r3, r63, r3 // Fill pattern now in every byte of r3 | |
| 34 | ||
| 35 | movi 8, r9 | |
| 36 | bgtu/u r23, r9, tr0 // multiquad | |
| 37 | ||
| 38 | beqi/u r4, 0, tr2 // Return with size 0 - ensures no mem accesses | |
| 39 | ldlo.q r2, 0, r7 | |
| 40 | shlli r4, 2, r4 | |
| 41 | movi -1, r8 | |
| 42 | SHHI r8, r4, r8 | |
| 43 | SHHI r8, r4, r8 | |
| 44 | mcmv r7, r8, r3 | |
| 45 | stlo.q r2, 0, r3 | |
| 46 | blink tr2, r63 | |
| 47 | ||
| 48 | multiquad: | |
| 49 | pta/l lastquad, tr0 | |
| 50 | stlo.q r2, 0, r3 | |
| 51 | shlri r23, 3, r24 | |
| 52 | add r2, r4, r5 | |
| 53 | beqi/u r24, 1, tr0 // lastquad | |
| 54 | pta/l loop, tr1 | |
| 55 | sub r2, r22, r25 | |
| 56 | andi r5, -8, r20 // calculate end address and | |
| 57 | addi r20, -7*8, r8 // loop end address; This might overflow, so we need | |
| 58 | // to use a different test before we start the loop | |
| 59 | bge/u r24, r9, tr1 // loop | |
| 60 | st.q r25, 8, r3 | |
| 61 | st.q r20, -8, r3 | |
| 62 | shlri r24, 1, r24 | |
| 63 | beqi/u r24, 1, tr0 // lastquad | |
| 64 | st.q r25, 16, r3 | |
| 65 | st.q r20, -16, r3 | |
| 66 | beqi/u r24, 2, tr0 // lastquad | |
| 67 | st.q r25, 24, r3 | |
| 68 | st.q r20, -24, r3 | |
| 69 | lastquad: | |
| 70 | sthi.q r5, -1, r3 | |
| 71 | blink tr2,r63 | |
| 72 | ||
| 73 | loop: | |
| 74 | !!! alloco r25, 32 // QQQ comment out for short-term fix to SHUK #3895. | |
| 75 | // QQQ commenting out is locically correct, but sub-optimal | |
| 76 | // QQQ Sean McGoogan - 4th April 2003. | |
| 77 | st.q r25, 8, r3 | |
| 78 | st.q r25, 16, r3 | |
| 79 | st.q r25, 24, r3 | |
| 80 | st.q r25, 32, r3 | |
| 81 | addi r25, 32, r25 | |
| 82 | bgeu/l r8, r25, tr1 // loop | |
| 83 | ||
| 84 | st.q r20, -40, r3 | |
| 85 | st.q r20, -32, r3 | |
| 86 | st.q r20, -24, r3 | |
| 87 | st.q r20, -16, r3 | |
| 88 | st.q r20, -8, r3 | |
| 89 | sthi.q r5, -1, r3 | |
| 90 | blink tr2,r63 | |
| 91 | ||
| 92 | .size memset,.-memset |