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MIPS: dspr2: Added optimization for function VP8LSubtractGreenFromBlueAndRed

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Change-Id: I683c73cceee4a40ca810deba15e54fbf7dbe8918
This commit is contained in:
Djordje Pesut 2014-11-06 09:37:02 +01:00
parent 11a25f75bd
commit aa42f4231f
1 changed files with 56 additions and 0 deletions
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56
src/dsp/lossless_mips_dsp_r2.c
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@ -145,6 +145,61 @@ static WEBP_INLINE uint32_t ClampedAddSubtractHalf(uint32_t c0, uint32_t c1,
return temp1;
}
static void SubtractGreenFromBlueAndRed(uint32_t* argb_data,
int num_pixels) {
uint32_t temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
uint32_t* const p_loop1_end = argb_data + (num_pixels & ~3);
uint32_t* const p_loop2_end = p_loop1_end + (num_pixels & 3);
__asm__ volatile (
".set push \n\t"
".set noreorder \n\t"
"beq %[argb_data], %[p_loop1_end], 3f \n\t"
" nop \n\t"
"0: \n\t"
"lw %[temp0], 0(%[argb_data]) \n\t"
"lw %[temp1], 4(%[argb_data]) \n\t"
"lw %[temp2], 8(%[argb_data]) \n\t"
"lw %[temp3], 12(%[argb_data]) \n\t"
"ext %[temp4], %[temp0], 8, 8 \n\t"
"ext %[temp5], %[temp1], 8, 8 \n\t"
"ext %[temp6], %[temp2], 8, 8 \n\t"
"ext %[temp7], %[temp3], 8, 8 \n\t"
"addiu %[argb_data], %[argb_data], 16 \n\t"
"replv.ph %[temp4], %[temp4] \n\t"
"replv.ph %[temp5], %[temp5] \n\t"
"replv.ph %[temp6], %[temp6] \n\t"
"replv.ph %[temp7], %[temp7] \n\t"
"subu.qb %[temp0], %[temp0], %[temp4] \n\t"
"subu.qb %[temp1], %[temp1], %[temp5] \n\t"
"subu.qb %[temp2], %[temp2], %[temp6] \n\t"
"subu.qb %[temp3], %[temp3], %[temp7] \n\t"
"sw %[temp0], -16(%[argb_data]) \n\t"
"sw %[temp1], -12(%[argb_data]) \n\t"
"sw %[temp2], -8(%[argb_data]) \n\t"
"bne %[argb_data], %[p_loop1_end], 0b \n\t"
" sw %[temp3], -4(%[argb_data]) \n\t"
"3: \n\t"
"beq %[argb_data], %[p_loop2_end], 2f \n\t"
" nop \n\t"
"1: \n\t"
"lw %[temp0], 0(%[argb_data]) \n\t"
"addiu %[argb_data], %[argb_data], 4 \n\t"
"ext %[temp4], %[temp0], 8, 8 \n\t"
"replv.ph %[temp4], %[temp4] \n\t"
"subu.qb %[temp0], %[temp0], %[temp4] \n\t"
"bne %[argb_data], %[p_loop2_end], 1b \n\t"
" sw %[temp0], -4(%[argb_data]) \n\t"
"2: \n\t"
".set pop \n\t"
: [argb_data]"+&r"(argb_data), [temp0]"=&r"(temp0),
[temp1]"=&r"(temp1), [temp2]"=&r"(temp2), [temp3]"=&r"(temp3),
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [temp6]"=&r"(temp6),
[temp7]"=&r"(temp7)
: [p_loop1_end]"r"(p_loop1_end), [p_loop2_end]"r"(p_loop2_end)
: "memory"
);
}
static uint32_t Predictor12(uint32_t left, const uint32_t* const top) {
return ClampedAddSubtractFull(left, top[0], top[-1]);
}
@ -165,6 +220,7 @@ void VP8LDspInitMIPSdspR2(void) {
VP8LMapColor8b = MapAlpha;
VP8LPredictors[12] = Predictor12;
VP8LPredictors[13] = Predictor13;
VP8LSubtractGreenFromBlueAndRed = SubtractGreenFromBlueAndRed;
#endif // WEBP_USE_MIPS_DSP_R2
}