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comparison: gfx/cairo/libpixman/src/pixman-arm-simd-asm-scaled.S
gfx/cairo/libpixman/src/pixman-arm-simd-asm-scaled.S
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:85383ca070d8 |
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| 1 /* | |
| 2 * Copyright © 2008 Mozilla Corporation | |
| 3 * Copyright © 2010 Nokia Corporation | |
| 4 * | |
| 5 * Permission to use, copy, modify, distribute, and sell this software and its | |
| 6 * documentation for any purpose is hereby granted without fee, provided that | |
| 7 * the above copyright notice appear in all copies and that both that | |
| 8 * copyright notice and this permission notice appear in supporting | |
| 9 * documentation, and that the name of Mozilla Corporation not be used in | |
| 10 * advertising or publicity pertaining to distribution of the software without | |
| 11 * specific, written prior permission. Mozilla Corporation makes no | |
| 12 * representations about the suitability of this software for any purpose. It | |
| 13 * is provided "as is" without express or implied warranty. | |
| 14 * | |
| 15 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS | |
| 16 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 17 * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY | |
| 18 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN | |
| 20 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING | |
| 21 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
| 22 * SOFTWARE. | |
| 23 * | |
| 24 * Author: Jeff Muizelaar (jeff@infidigm.net) | |
| 25 * | |
| 26 */ | |
| 27 | |
| 28 /* Prevent the stack from becoming executable */ | |
| 29 #if defined(__linux__) && defined(__ELF__) | |
| 30 .section .note.GNU-stack,"",%progbits | |
| 31 #endif | |
| 32 | |
| 33 .text | |
| 34 .arch armv6 | |
| 35 .object_arch armv4 | |
| 36 .arm | |
| 37 .altmacro | |
| 38 .p2align 2 | |
| 39 | |
| 40 /* Supplementary macro for setting function attributes */ | |
| 41 .macro pixman_asm_function fname | |
| 42 .func fname | |
| 43 .global fname | |
| 44 #ifdef __ELF__ | |
| 45 .hidden fname | |
| 46 .type fname, %function | |
| 47 #endif | |
| 48 fname: | |
| 49 .endm | |
| 50 | |
| 51 /* | |
| 52 * Note: This code is only using armv5te instructions (not even armv6), | |
| 53 * but is scheduled for ARM Cortex-A8 pipeline. So it might need to | |
| 54 * be split into a few variants, tuned for each microarchitecture. | |
| 55 * | |
| 56 * TODO: In order to get good performance on ARM9/ARM11 cores (which don't | |
| 57 * have efficient write combining), it needs to be changed to use 16-byte | |
| 58 * aligned writes using STM instruction. | |
| 59 * | |
| 60 * Nearest scanline scaler macro template uses the following arguments: | |
| 61 * fname - name of the function to generate | |
| 62 * bpp_shift - (1 << bpp_shift) is the size of pixel in bytes | |
| 63 * t - type suffix for LDR/STR instructions | |
| 64 * prefetch_distance - prefetch in the source image by that many | |
| 65 * pixels ahead | |
| 66 * prefetch_braking_distance - stop prefetching when that many pixels are | |
| 67 * remaining before the end of scanline | |
| 68 */ | |
| 69 | |
| 70 .macro generate_nearest_scanline_func fname, bpp_shift, t, \ | |
| 71 prefetch_distance, \ | |
| 72 prefetch_braking_distance | |
| 73 | |
| 74 pixman_asm_function fname | |
| 75 W .req r0 | |
| 76 DST .req r1 | |
| 77 SRC .req r2 | |
| 78 VX .req r3 | |
| 79 UNIT_X .req ip | |
| 80 TMP1 .req r4 | |
| 81 TMP2 .req r5 | |
| 82 VXMASK .req r6 | |
| 83 PF_OFFS .req r7 | |
| 84 SRC_WIDTH_FIXED .req r8 | |
| 85 | |
| 86 ldr UNIT_X, [sp] | |
| 87 push {r4, r5, r6, r7, r8, r10} | |
| 88 mvn VXMASK, #((1 << bpp_shift) - 1) | |
| 89 ldr SRC_WIDTH_FIXED, [sp, #28] | |
| 90 | |
| 91 /* define helper macro */ | |
| 92 .macro scale_2_pixels | |
| 93 ldr&t TMP1, [SRC, TMP1] | |
| 94 and TMP2, VXMASK, VX, asr #(16 - bpp_shift) | |
| 95 adds VX, VX, UNIT_X | |
| 96 str&t TMP1, [DST], #(1 << bpp_shift) | |
| 97 9: subpls VX, VX, SRC_WIDTH_FIXED | |
| 98 bpl 9b | |
| 99 | |
| 100 ldr&t TMP2, [SRC, TMP2] | |
| 101 and TMP1, VXMASK, VX, asr #(16 - bpp_shift) | |
| 102 adds VX, VX, UNIT_X | |
| 103 str&t TMP2, [DST], #(1 << bpp_shift) | |
| 104 9: subpls VX, VX, SRC_WIDTH_FIXED | |
| 105 bpl 9b | |
| 106 .endm | |
| 107 | |
| 108 /* now do the scaling */ | |
| 109 and TMP1, VXMASK, VX, asr #(16 - bpp_shift) | |
| 110 adds VX, VX, UNIT_X | |
| 111 9: subpls VX, VX, SRC_WIDTH_FIXED | |
| 112 bpl 9b | |
| 113 subs W, W, #(8 + prefetch_braking_distance) | |
| 114 blt 2f | |
| 115 /* calculate prefetch offset */ | |
| 116 mov PF_OFFS, #prefetch_distance | |
| 117 mla PF_OFFS, UNIT_X, PF_OFFS, VX | |
| 118 1: /* main loop, process 8 pixels per iteration with prefetch */ | |
| 119 pld [SRC, PF_OFFS, asr #(16 - bpp_shift)] | |
| 120 add PF_OFFS, UNIT_X, lsl #3 | |
| 121 scale_2_pixels | |
| 122 scale_2_pixels | |
| 123 scale_2_pixels | |
| 124 scale_2_pixels | |
| 125 subs W, W, #8 | |
| 126 bge 1b | |
| 127 2: | |
| 128 subs W, W, #(4 - 8 - prefetch_braking_distance) | |
| 129 blt 2f | |
| 130 1: /* process the remaining pixels */ | |
| 131 scale_2_pixels | |
| 132 scale_2_pixels | |
| 133 subs W, W, #4 | |
| 134 bge 1b | |
| 135 2: | |
| 136 tst W, #2 | |
| 137 beq 2f | |
| 138 scale_2_pixels | |
| 139 2: | |
| 140 tst W, #1 | |
| 141 ldrne&t TMP1, [SRC, TMP1] | |
| 142 strne&t TMP1, [DST] | |
| 143 /* cleanup helper macro */ | |
| 144 .purgem scale_2_pixels | |
| 145 .unreq DST | |
| 146 .unreq SRC | |
| 147 .unreq W | |
| 148 .unreq VX | |
| 149 .unreq UNIT_X | |
| 150 .unreq TMP1 | |
| 151 .unreq TMP2 | |
| 152 .unreq VXMASK | |
| 153 .unreq PF_OFFS | |
| 154 .unreq SRC_WIDTH_FIXED | |
| 155 /* return */ | |
| 156 pop {r4, r5, r6, r7, r8, r10} | |
| 157 bx lr | |
| 158 .endfunc | |
| 159 .endm | |
| 160 | |
| 161 generate_nearest_scanline_func \ | |
| 162 pixman_scaled_nearest_scanline_0565_0565_SRC_asm_armv6, 1, h, 80, 32 | |
| 163 | |
| 164 generate_nearest_scanline_func \ | |
| 165 pixman_scaled_nearest_scanline_8888_8888_SRC_asm_armv6, 2, , 48, 32 |
