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Write S32A_Opaque_BlitRow32 function in ARM assembly.

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(Improves the rendering performance on ARM cores lacking NEON.)

Performance improvement about ~9% on Peacekeeper rendering benchmarks.

Patch by: Vasileios Laganakos (ARM)

http://codereview.appspot.com/1873044/

git-svn-id: http://skia.googlecode.com/svn/trunk@595 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
agl@chromium.org 2010-08-17 16:24:15 +00:00
parent 21417a7b4b
commit 94d1464cca
1 changed files with 98 additions and 1 deletions
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99
src/opts/SkBlitRow_opts_arm.cpp
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@ -555,8 +555,105 @@ static void S32A_Opaque_BlitRow32_neon(SkPMColor* SK_RESTRICT dst,
}
#define S32A_Opaque_BlitRow32_PROC S32A_Opaque_BlitRow32_neon
#else
#define S32A_Opaque_BlitRow32_PROC NULL
#ifdef TEST_SRC_ALPHA
#error The ARM asm version of S32A_Opaque_BlitRow32 does not support TEST_SRC_ALPHA
#endif
static void S32A_Opaque_BlitRow32_arm(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src,
int count, U8CPU alpha) {
SkASSERT(255 == alpha);
/* Does not support the TEST_SRC_ALPHA case */
asm volatile (
"cmp %[count], #0 \n\t" /* comparing count with 0 */
"beq 3f \n\t" /* if zero exit */
"mov ip, #0xff \n\t" /* load the 0xff mask in ip */
"orr ip, ip, ip, lsl #16 \n\t" /* convert it to 0xff00ff in ip */
"cmp %[count], #2 \n\t" /* compare count with 2 */
"blt 2f \n\t" /* if less than 2 -> single loop */
/* Double Loop */
"1: \n\t" /* <double loop> */
"ldm %[src]!, {r5,r6} \n\t" /* load the src(s) at r5-r6 */
"ldm %[dst], {r7,r8} \n\t" /* loading dst(s) into r7-r8 */
"lsr r4, r5, #24 \n\t" /* extracting the alpha from source and storing it to r4 */
/* ----------- */
"and r9, ip, r7 \n\t" /* r9 = br masked by ip */
"rsb r4, r4, #256 \n\t" /* subtracting the alpha from 256 -> r4=scale */
"and r10, ip, r7, lsr #8 \n\t" /* r10 = ag masked by ip */
"mul r9, r9, r4 \n\t" /* br = br * scale */
"mul r10, r10, r4 \n\t" /* ag = ag * scale */
"and r9, ip, r9, lsr #8 \n\t" /* lsr br by 8 and mask it */
"and r10, r10, ip, lsl #8 \n\t" /* mask ag with reverse mask */
"lsr r4, r6, #24 \n\t" /* extracting the alpha from source and storing it to r4 */
"orr r7, r9, r10 \n\t" /* br | ag*/
"add r7, r5, r7 \n\t" /* dst = src + calc dest(r7) */
"rsb r4, r4, #256 \n\t" /* subtracting the alpha from 255 -> r4=scale */
/* ----------- */
"and r9, ip, r8 \n\t" /* r9 = br masked by ip */
"and r10, ip, r8, lsr #8 \n\t" /* r10 = ag masked by ip */
"mul r9, r9, r4 \n\t" /* br = br * scale */
"sub %[count], %[count], #2 \n\t"
"mul r10, r10, r4 \n\t" /* ag = ag * scale */
"and r9, ip, r9, lsr #8 \n\t" /* lsr br by 8 and mask it */
"and r10, r10, ip, lsl #8 \n\t" /* mask ag with reverse mask */
"cmp %[count], #1 \n\t" /* comparing count with 1 */
"orr r8, r9, r10 \n\t" /* br | ag */
"add r8, r6, r8 \n\t" /* dst = src + calc dest(r8) */
/* ----------------- */
"stm %[dst]!, {r7,r8} \n\t" /* *dst = r7, increment dst by two (each times 4) */
/* ----------------- */
"bgt 1b \n\t" /* if greater than 1 -> reloop */
"blt 3f \n\t" /* if less than 1 -> exit */
/* Single Loop */
"2: \n\t" /* <single loop> */
"ldr r5, [%[src]], #4 \n\t" /* load the src pointer into r5 r5=src */
"ldr r7, [%[dst]] \n\t" /* loading dst into r7 */
"lsr r4, r5, #24 \n\t" /* extracting the alpha from source and storing it to r4 */
/* ----------- */
"and r9, ip, r7 \n\t" /* r9 = br masked by ip */
"rsb r4, r4, #256 \n\t" /* subtracting the alpha from 256 -> r4=scale */
"and r10, ip, r7, lsr #8 \n\t" /* r10 = ag masked by ip */
"mul r9, r9, r4 \n\t" /* br = br * scale */
"mul r10, r10, r4 \n\t" /* ag = ag * scale */
"and r9, ip, r9, lsr #8 \n\t" /* lsr br by 8 and mask it */
"and r10, r10, ip, lsl #8 \n\t" /* mask ag */
"orr r7, r9, r10 \n\t" /* br | ag */
"add r7, r5, r7 \n\t" /* *dst = src + calc dest(r7) */
/* ----------------- */
"str r7, [%[dst]], #4 \n\t" /* *dst = r7, increment dst by one (times 4) */
/* ----------------- */
"3: \n\t" /* <exit> */
: [dst] "+r" (dst), [src] "+r" (src), [count] "+r" (count)
:
: "cc", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "ip", "memory"
);
}
#define S32A_Opaque_BlitRow32_PROC S32A_Opaque_BlitRow32_arm
#endif
/* Neon version of S32_Blend_BlitRow32()