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Diffstat (limited to 'src/pixman/pixman/pixman-arm-simd-asm-scaled.S')
| -rw-r--r-- | src/pixman/pixman/pixman-arm-simd-asm-scaled.S | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/src/pixman/pixman/pixman-arm-simd-asm-scaled.S b/src/pixman/pixman/pixman-arm-simd-asm-scaled.S new file mode 100644 index 0000000..7110995 --- /dev/null +++ b/src/pixman/pixman/pixman-arm-simd-asm-scaled.S @@ -0,0 +1,165 @@ +/* + * Copyright © 2008 Mozilla Corporation + * Copyright © 2010 Nokia Corporation + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that + * copyright notice and this permission notice appear in supporting + * documentation, and that the name of Mozilla Corporation not be used in + * advertising or publicity pertaining to distribution of the software without + * specific, written prior permission. Mozilla Corporation makes no + * representations about the suitability of this software for any purpose. It + * is provided "as is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY + * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN + * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING + * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + * + * Author: Jeff Muizelaar (jeff@infidigm.net) + * + */ + +/* Prevent the stack from becoming executable */ +#if defined(__linux__) && defined(__ELF__) +.section .note.GNU-stack,"",%progbits +#endif + + .text + .arch armv6 + .object_arch armv4 + .arm + .altmacro + .p2align 2 + +/* Supplementary macro for setting function attributes */ +.macro pixman_asm_function fname + .func fname + .global fname +#ifdef __ELF__ + .hidden fname + .type fname, %function +#endif +fname: +.endm + +/* + * Note: This code is only using armv5te instructions (not even armv6), + * but is scheduled for ARM Cortex-A8 pipeline. So it might need to + * be split into a few variants, tuned for each microarchitecture. + * + * TODO: In order to get good performance on ARM9/ARM11 cores (which don't + * have efficient write combining), it needs to be changed to use 16-byte + * aligned writes using STM instruction. + * + * Nearest scanline scaler macro template uses the following arguments: + * fname - name of the function to generate + * bpp_shift - (1 << bpp_shift) is the size of pixel in bytes + * t - type suffix for LDR/STR instructions + * prefetch_distance - prefetch in the source image by that many + * pixels ahead + * prefetch_braking_distance - stop prefetching when that many pixels are + * remaining before the end of scanline + */ + +.macro generate_nearest_scanline_func fname, bpp_shift, t, \ + prefetch_distance, \ + prefetch_braking_distance + +pixman_asm_function fname + W .req r0 + DST .req r1 + SRC .req r2 + VX .req r3 + UNIT_X .req ip + TMP1 .req r4 + TMP2 .req r5 + VXMASK .req r6 + PF_OFFS .req r7 + SRC_WIDTH_FIXED .req r8 + + ldr UNIT_X, [sp] + push {r4, r5, r6, r7, r8, r10} + mvn VXMASK, #((1 << bpp_shift) - 1) + ldr SRC_WIDTH_FIXED, [sp, #28] + + /* define helper macro */ + .macro scale_2_pixels + ldr&t TMP1, [SRC, TMP1] + and TMP2, VXMASK, VX, asr #(16 - bpp_shift) + adds VX, VX, UNIT_X + str&t TMP1, [DST], #(1 << bpp_shift) +9: subpls VX, VX, SRC_WIDTH_FIXED + bpl 9b + + ldr&t TMP2, [SRC, TMP2] + and TMP1, VXMASK, VX, asr #(16 - bpp_shift) + adds VX, VX, UNIT_X + str&t TMP2, [DST], #(1 << bpp_shift) +9: subpls VX, VX, SRC_WIDTH_FIXED + bpl 9b + .endm + + /* now do the scaling */ + and TMP1, VXMASK, VX, asr #(16 - bpp_shift) + adds VX, VX, UNIT_X +9: subpls VX, VX, SRC_WIDTH_FIXED + bpl 9b + subs W, W, #(8 + prefetch_braking_distance) + blt 2f + /* calculate prefetch offset */ + mov PF_OFFS, #prefetch_distance + mla PF_OFFS, UNIT_X, PF_OFFS, VX +1: /* main loop, process 8 pixels per iteration with prefetch */ + pld [SRC, PF_OFFS, asr #(16 - bpp_shift)] + add PF_OFFS, UNIT_X, lsl #3 + scale_2_pixels + scale_2_pixels + scale_2_pixels + scale_2_pixels + subs W, W, #8 + bge 1b +2: + subs W, W, #(4 - 8 - prefetch_braking_distance) + blt 2f +1: /* process the remaining pixels */ + scale_2_pixels + scale_2_pixels + subs W, W, #4 + bge 1b +2: + tst W, #2 + beq 2f + scale_2_pixels +2: + tst W, #1 + ldrne&t TMP1, [SRC, TMP1] + strne&t TMP1, [DST] + /* cleanup helper macro */ + .purgem scale_2_pixels + .unreq DST + .unreq SRC + .unreq W + .unreq VX + .unreq UNIT_X + .unreq TMP1 + .unreq TMP2 + .unreq VXMASK + .unreq PF_OFFS + .unreq SRC_WIDTH_FIXED + /* return */ + pop {r4, r5, r6, r7, r8, r10} + bx lr +.endfunc +.endm + +generate_nearest_scanline_func \ + pixman_scaled_nearest_scanline_0565_0565_SRC_asm_armv6, 1, h, 80, 32 + +generate_nearest_scanline_func \ + pixman_scaled_nearest_scanline_8888_8888_SRC_asm_armv6, 2, , 48, 32 |
