gfx/cairo/libpixman/src/pixman-arm-simd-asm-scaled.S@6474c204b198 (annotated)
gfx/cairo/libpixman/src/pixman-arm-simd-asm-scaled.S
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright © 2008 Mozilla Corporation |
| michael@0 | 3 | * Copyright © 2010 Nokia Corporation |
| michael@0 | 4 | * |
| michael@0 | 5 | * Permission to use, copy, modify, distribute, and sell this software and its |
| michael@0 | 6 | * documentation for any purpose is hereby granted without fee, provided that |
| michael@0 | 7 | * the above copyright notice appear in all copies and that both that |
| michael@0 | 8 | * copyright notice and this permission notice appear in supporting |
| michael@0 | 9 | * documentation, and that the name of Mozilla Corporation not be used in |
| michael@0 | 10 | * advertising or publicity pertaining to distribution of the software without |
| michael@0 | 11 | * specific, written prior permission. Mozilla Corporation makes no |
| michael@0 | 12 | * representations about the suitability of this software for any purpose. It |
| michael@0 | 13 | * is provided "as is" without express or implied warranty. |
| michael@0 | 14 | * |
| michael@0 | 15 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS |
| michael@0 | 16 | * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| michael@0 | 17 | * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| michael@0 | 18 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| michael@0 | 19 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN |
| michael@0 | 20 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING |
| michael@0 | 21 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| michael@0 | 22 | * SOFTWARE. |
| michael@0 | 23 | * |
| michael@0 | 24 | * Author: Jeff Muizelaar (jeff@infidigm.net) |
| michael@0 | 25 | * |
| michael@0 | 26 | */ |
| michael@0 | 27 | |
| michael@0 | 28 | /* Prevent the stack from becoming executable */ |
| michael@0 | 29 | #if defined(__linux__) && defined(__ELF__) |
| michael@0 | 30 | .section .note.GNU-stack,"",%progbits |
| michael@0 | 31 | #endif |
| michael@0 | 32 | |
| michael@0 | 33 | .text |
| michael@0 | 34 | .arch armv6 |
| michael@0 | 35 | .object_arch armv4 |
| michael@0 | 36 | .arm |
| michael@0 | 37 | .altmacro |
| michael@0 | 38 | .p2align 2 |
| michael@0 | 39 | |
| michael@0 | 40 | /* Supplementary macro for setting function attributes */ |
| michael@0 | 41 | .macro pixman_asm_function fname |
| michael@0 | 42 | .func fname |
| michael@0 | 43 | .global fname |
| michael@0 | 44 | #ifdef __ELF__ |
| michael@0 | 45 | .hidden fname |
| michael@0 | 46 | .type fname, %function |
| michael@0 | 47 | #endif |
| michael@0 | 48 | fname: |
| michael@0 | 49 | .endm |
| michael@0 | 50 | |
| michael@0 | 51 | /* |
| michael@0 | 52 | * Note: This code is only using armv5te instructions (not even armv6), |
| michael@0 | 53 | * but is scheduled for ARM Cortex-A8 pipeline. So it might need to |
| michael@0 | 54 | * be split into a few variants, tuned for each microarchitecture. |
| michael@0 | 55 | * |
| michael@0 | 56 | * TODO: In order to get good performance on ARM9/ARM11 cores (which don't |
| michael@0 | 57 | * have efficient write combining), it needs to be changed to use 16-byte |
| michael@0 | 58 | * aligned writes using STM instruction. |
| michael@0 | 59 | * |
| michael@0 | 60 | * Nearest scanline scaler macro template uses the following arguments: |
| michael@0 | 61 | * fname - name of the function to generate |
| michael@0 | 62 | * bpp_shift - (1 << bpp_shift) is the size of pixel in bytes |
| michael@0 | 63 | * t - type suffix for LDR/STR instructions |
| michael@0 | 64 | * prefetch_distance - prefetch in the source image by that many |
| michael@0 | 65 | * pixels ahead |
| michael@0 | 66 | * prefetch_braking_distance - stop prefetching when that many pixels are |
| michael@0 | 67 | * remaining before the end of scanline |
| michael@0 | 68 | */ |
| michael@0 | 69 | |
| michael@0 | 70 | .macro generate_nearest_scanline_func fname, bpp_shift, t, \ |
| michael@0 | 71 | prefetch_distance, \ |
| michael@0 | 72 | prefetch_braking_distance |
| michael@0 | 73 | |
| michael@0 | 74 | pixman_asm_function fname |
| michael@0 | 75 | W .req r0 |
| michael@0 | 76 | DST .req r1 |
| michael@0 | 77 | SRC .req r2 |
| michael@0 | 78 | VX .req r3 |
| michael@0 | 79 | UNIT_X .req ip |
| michael@0 | 80 | TMP1 .req r4 |
| michael@0 | 81 | TMP2 .req r5 |
| michael@0 | 82 | VXMASK .req r6 |
| michael@0 | 83 | PF_OFFS .req r7 |
| michael@0 | 84 | SRC_WIDTH_FIXED .req r8 |
| michael@0 | 85 | |
| michael@0 | 86 | ldr UNIT_X, [sp] |
| michael@0 | 87 | push {r4, r5, r6, r7, r8, r10} |
| michael@0 | 88 | mvn VXMASK, #((1 << bpp_shift) - 1) |
| michael@0 | 89 | ldr SRC_WIDTH_FIXED, [sp, #28] |
| michael@0 | 90 | |
| michael@0 | 91 | /* define helper macro */ |
| michael@0 | 92 | .macro scale_2_pixels |
| michael@0 | 93 | ldr&t TMP1, [SRC, TMP1] |
| michael@0 | 94 | and TMP2, VXMASK, VX, asr #(16 - bpp_shift) |
| michael@0 | 95 | adds VX, VX, UNIT_X |
| michael@0 | 96 | str&t TMP1, [DST], #(1 << bpp_shift) |
| michael@0 | 97 | 9: subpls VX, VX, SRC_WIDTH_FIXED |
| michael@0 | 98 | bpl 9b |
| michael@0 | 99 | |
| michael@0 | 100 | ldr&t TMP2, [SRC, TMP2] |
| michael@0 | 101 | and TMP1, VXMASK, VX, asr #(16 - bpp_shift) |
| michael@0 | 102 | adds VX, VX, UNIT_X |
| michael@0 | 103 | str&t TMP2, [DST], #(1 << bpp_shift) |
| michael@0 | 104 | 9: subpls VX, VX, SRC_WIDTH_FIXED |
| michael@0 | 105 | bpl 9b |
| michael@0 | 106 | .endm |
| michael@0 | 107 | |
| michael@0 | 108 | /* now do the scaling */ |
| michael@0 | 109 | and TMP1, VXMASK, VX, asr #(16 - bpp_shift) |
| michael@0 | 110 | adds VX, VX, UNIT_X |
| michael@0 | 111 | 9: subpls VX, VX, SRC_WIDTH_FIXED |
| michael@0 | 112 | bpl 9b |
| michael@0 | 113 | subs W, W, #(8 + prefetch_braking_distance) |
| michael@0 | 114 | blt 2f |
| michael@0 | 115 | /* calculate prefetch offset */ |
| michael@0 | 116 | mov PF_OFFS, #prefetch_distance |
| michael@0 | 117 | mla PF_OFFS, UNIT_X, PF_OFFS, VX |
| michael@0 | 118 | 1: /* main loop, process 8 pixels per iteration with prefetch */ |
| michael@0 | 119 | pld [SRC, PF_OFFS, asr #(16 - bpp_shift)] |
| michael@0 | 120 | add PF_OFFS, UNIT_X, lsl #3 |
| michael@0 | 121 | scale_2_pixels |
| michael@0 | 122 | scale_2_pixels |
| michael@0 | 123 | scale_2_pixels |
| michael@0 | 124 | scale_2_pixels |
| michael@0 | 125 | subs W, W, #8 |
| michael@0 | 126 | bge 1b |
| michael@0 | 127 | 2: |
| michael@0 | 128 | subs W, W, #(4 - 8 - prefetch_braking_distance) |
| michael@0 | 129 | blt 2f |
| michael@0 | 130 | 1: /* process the remaining pixels */ |
| michael@0 | 131 | scale_2_pixels |
| michael@0 | 132 | scale_2_pixels |
| michael@0 | 133 | subs W, W, #4 |
| michael@0 | 134 | bge 1b |
| michael@0 | 135 | 2: |
| michael@0 | 136 | tst W, #2 |
| michael@0 | 137 | beq 2f |
| michael@0 | 138 | scale_2_pixels |
| michael@0 | 139 | 2: |
| michael@0 | 140 | tst W, #1 |
| michael@0 | 141 | ldrne&t TMP1, [SRC, TMP1] |
| michael@0 | 142 | strne&t TMP1, [DST] |
| michael@0 | 143 | /* cleanup helper macro */ |
| michael@0 | 144 | .purgem scale_2_pixels |
| michael@0 | 145 | .unreq DST |
| michael@0 | 146 | .unreq SRC |
| michael@0 | 147 | .unreq W |
| michael@0 | 148 | .unreq VX |
| michael@0 | 149 | .unreq UNIT_X |
| michael@0 | 150 | .unreq TMP1 |
| michael@0 | 151 | .unreq TMP2 |
| michael@0 | 152 | .unreq VXMASK |
| michael@0 | 153 | .unreq PF_OFFS |
| michael@0 | 154 | .unreq SRC_WIDTH_FIXED |
| michael@0 | 155 | /* return */ |
| michael@0 | 156 | pop {r4, r5, r6, r7, r8, r10} |
| michael@0 | 157 | bx lr |
| michael@0 | 158 | .endfunc |
| michael@0 | 159 | .endm |
| michael@0 | 160 | |
| michael@0 | 161 | generate_nearest_scanline_func \ |
| michael@0 | 162 | pixman_scaled_nearest_scanline_0565_0565_SRC_asm_armv6, 1, h, 80, 32 |
| michael@0 | 163 | |
| michael@0 | 164 | generate_nearest_scanline_func \ |
| michael@0 | 165 | pixman_scaled_nearest_scanline_8888_8888_SRC_asm_armv6, 2, , 48, 32 |
