[444] | 1 | ! |
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| 2 | ! Fast SH memset |
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| 3 | ! |
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| 4 | ! by Toshiyasu Morita (tm@netcom.com) |
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| 5 | ! |
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| 6 | ! SH5 code by J"orn Rennecke (joern.rennecke@superh.com) |
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| 7 | ! Copyright 2002 SuperH Ltd. |
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| 8 | ! |
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| 9 | |
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| 10 | #include "asm.h" |
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| 11 | |
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| 12 | ENTRY(memset) |
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| 13 | #if __SHMEDIA__ |
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| 14 | pta/l multiquad, tr0 |
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| 15 | ptabs r18, tr2 |
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| 16 | |
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| 17 | andi r2, -8, r25 |
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| 18 | add r2, r4, r5 |
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| 19 | addi r5, -1, r20 // calculate end address. |
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| 20 | andi r20, -8, r20 |
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| 21 | cmveq r4, r25, r20 |
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| 22 | bne/u r25, r20, tr0 // multiquad |
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| 23 | |
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| 24 | ! This sequence could clobber volatile objects that are in the same |
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| 25 | ! quadword as a very short char array. |
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| 26 | ! ldlo.q r2, 0, r7 |
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| 27 | ! shlli r4, 2, r4 |
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| 28 | ! movi -1, r8 |
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| 29 | ! SHHI r8, r4, r8 |
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| 30 | ! SHHI r8, r4, r8 |
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| 31 | ! mcmv r7, r8, r3 |
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| 32 | ! stlo.q r2, 0, r3 |
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| 33 | |
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| 34 | pta/l setlongs, tr0 |
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| 35 | movi 4, r8 |
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| 36 | bgeu/u r4, r8, tr0 |
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| 37 | pta/l endset, tr0 |
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| 38 | beqi/u r4, 0, tr0 |
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| 39 | st.b r2, 0, r3 |
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| 40 | beqi/u r4, 1, tr0 |
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| 41 | nop |
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| 42 | st.b r2, 1, r3 |
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| 43 | beqi/l r4, 2, tr0 |
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| 44 | st.b r2,2,r3 |
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| 45 | endset: blink tr2, r63 |
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| 46 | setlongs: |
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| 47 | mshflo.b r3, r3, r3 |
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| 48 | mperm.w r3, r63, r3 // Fill pattern now in every byte of r3 |
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| 49 | stlo.l r2, 0, r3 |
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| 50 | nop |
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| 51 | nop |
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| 52 | sthi.l r5, -1, r3 |
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| 53 | blink tr2, r63 |
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| 54 | |
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| 55 | multiquad: |
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| 56 | mshflo.b r3, r3, r3 |
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| 57 | mperm.w r3, r63, r3 // Fill pattern now in every byte of r3 |
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| 58 | pta/l lastquad, tr0 |
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| 59 | stlo.q r2, 0, r3 |
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| 60 | sub r20, r25, r24 |
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| 61 | movi 64, r9 |
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| 62 | beqi/u r24, 8, tr0 // lastquad |
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| 63 | pta/l loop, tr1 |
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| 64 | addi r20, -7*8, r8 // loop end address; This might overflow, so we need |
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| 65 | // to use a different test before we start the loop |
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| 66 | bgeu/u r24, r9, tr1// loop |
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| 67 | st.q r25, 8, r3 |
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| 68 | shlri r24, 4, r24 |
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| 69 | st.q r20, -8, r3 |
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| 70 | beqi/u r24, 1, tr0 // lastquad |
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| 71 | st.q r25, 16, r3 |
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| 72 | st.q r20, -16, r3 |
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| 73 | beqi/u r24, 2, tr0 // lastquad |
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| 74 | st.q r25, 24, r3 |
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| 75 | st.q r20, -24, r3 |
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| 76 | lastquad: |
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| 77 | sthi.q r5, -1, r3 |
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| 78 | blink tr2,r63 |
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| 79 | |
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| 80 | loop: |
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| 81 | alloco r25, 32 |
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| 82 | st.q r25, 8, r3 |
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| 83 | st.q r25, 16, r3 |
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| 84 | st.q r25, 24, r3 |
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| 85 | st.q r25, 32, r3 |
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| 86 | addi r25, 32, r25 |
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| 87 | bgeu/l r8, r25, tr1 // loop |
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| 88 | |
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| 89 | st.q r20, -40, r3 |
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| 90 | st.q r20, -32, r3 |
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| 91 | st.q r20, -24, r3 |
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| 92 | st.q r20, -16, r3 |
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| 93 | st.q r20, -8, r3 |
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| 94 | sthi.q r5, -1, r3 |
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| 95 | blink tr2,r63 |
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| 96 | #else /* ! SHMEDIA, i.e. SH1 .. SH4 / SHcompact */ |
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| 97 | ! Entry: r4: destination pointer |
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| 98 | ! r5: fill value |
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| 99 | ! r6: byte count |
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| 100 | ! |
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| 101 | ! Exit: r0-r3: trashed |
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| 102 | ! |
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| 103 | |
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| 104 | ! This assumes that the first four bytes of the address space (0..3) are |
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| 105 | ! reserved - usually by the linker script. Otherwise, we would had to check |
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| 106 | ! for the case of objects of the size 12..15 at address 0..3 . |
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| 107 | |
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| 108 | #ifdef __SH5__ |
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| 109 | #define DST r2 |
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| 110 | #define VAL r3 |
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| 111 | #define CNT r4 |
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| 112 | #define TMP r5 |
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| 113 | #else |
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| 114 | #define DST r4 |
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| 115 | #define VAL r5 |
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| 116 | #define CNT r6 |
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| 117 | #define TMP r2 |
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| 118 | #endif |
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| 119 | |
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| 120 | mov #12,r0 ! Check for small number of bytes |
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| 121 | cmp/gt CNT,r0 |
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| 122 | mov DST,r0 |
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| 123 | SL(bt, L_store_byte_loop_check0, add DST,CNT) |
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| 124 | |
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| 125 | tst #3,r0 ! Align destination |
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| 126 | SL(bt, L_dup_bytes, extu.b r5,r5) |
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| 127 | .balignw 4,0x0009 |
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| 128 | L_align_loop: |
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| 129 | mov.b VAL,@r0 |
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| 130 | add #1,r0 |
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| 131 | tst #3,r0 |
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| 132 | bf L_align_loop |
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| 133 | |
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| 134 | L_dup_bytes: |
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| 135 | swap.b VAL,TMP ! Duplicate bytes across longword |
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| 136 | or TMP,VAL |
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| 137 | swap.w VAL,TMP |
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| 138 | or TMP,VAL |
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| 139 | |
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| 140 | add #-16,CNT |
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| 141 | |
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| 142 | .balignw 4,0x0009 |
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| 143 | L_store_long_loop: |
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| 144 | mov.l VAL,@r0 ! Store double longs to memory |
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| 145 | cmp/hs CNT,r0 |
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| 146 | mov.l VAL,@(4,r0) |
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| 147 | SL(bf, L_store_long_loop, add #8,r0) |
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| 148 | |
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| 149 | add #16,CNT |
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| 150 | |
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| 151 | L_store_byte_loop_check0: |
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| 152 | cmp/eq CNT,r0 |
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| 153 | bt L_exit |
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| 154 | .balignw 4,0x0009 |
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| 155 | L_store_byte_loop: |
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| 156 | mov.b VAL,@r0 ! Store bytes to memory |
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| 157 | add #1,r0 |
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| 158 | cmp/eq CNT,r0 |
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| 159 | bf L_store_byte_loop |
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| 160 | |
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| 161 | L_exit: |
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| 162 | rts |
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| 163 | mov r4,r0 |
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| 164 | #endif /* ! SHMEDIA */ |
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