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MIPS: MIPS32r1: Added optimizations for ExtraCost functions.

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ExtraCost and ExtraCostCombined

Change-Id: I7eceb9ce2807296c6b43b974e4216879ddcd79f2
This commit is contained in:
Djordje Pesut
2014-04-15 12:55:20 +02:00
committed by skal
parent a8fe8ce231
commit 4ae0533f39
4 changed files with 144 additions and 28 deletions
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99
src/dsp/lossless_mips32.c
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@ -9,7 +9,8 @@
//
// MIPS version of lossless functions
//
// Author(s): Jovan Zelincevic (jovan.zelincevic@imgtec.com)
// Author(s): Djordje Pesut (djordje.pesut@imgtec.com)
// Jovan Zelincevic (jovan.zelincevic@imgtec.com)
#include "./dsp.h"
#include "./lossless.h"
@ -93,6 +94,100 @@ static float FastLog2SlowMIPS32(int v) {
}
}
// C version of this function:
// int i = 0;
// int64_t cost = 0;
// int* pop = (int*)&population[4];
// const int* LoopEnd = (int*)&population[length];
// while (pop != LoopEnd) {
// ++i;
// cost += i * *pop;
// cost += i * *(pop + 1);
// pop += 2;
// }
// return (double)cost;
static double ExtraCostMIPS32(const int* const population, int length) {
int i, temp0, temp1;
int* pop = (int*)&population[4];
const int* LoopEnd = (int*)&population[length];
__asm__ volatile(
"mult $zero, $zero \n\t"
"xor %[i], %[i], %[i] \n\t"
"beq %[pop], %[LoopEnd], 2f \n\t"
"1: \n\t"
"lw %[temp0], 0(%[pop]) \n\t"
"lw %[temp1], 4(%[pop]) \n\t"
"addiu %[i], %[i], 1 \n\t"
"addiu %[pop], %[pop], 8 \n\t"
"madd %[i], %[temp0] \n\t"
"madd %[i], %[temp1] \n\t"
"bne %[pop], %[LoopEnd], 1b \n\t"
"2: \n\t"
"mfhi %[temp0] \n\t"
"mflo %[temp1] \n\t"
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1),
[i]"=&r"(i), [pop]"+r"(pop)
: [LoopEnd]"r"(LoopEnd)
: "memory", "hi", "lo"
);
return (double)((int64_t)temp0 << 32 | temp1);
}
// C version of this function:
// int i = 0;
// int64_t cost = 0;
// int* pX = (int*)&X[4];
// int* pY = (int*)&Y[4];
// const int* LoopEnd = (int*)&X[length];
// while (pX != LoopEnd) {
// const int xy0 = *pX + *pY;
// const int xy1 = *(pX + 1) + *(pY + 1);
// ++i;
// cost += i * xy0;
// cost += i * xy1;
// pX += 2;
// pY += 2;
// }
// return (double)cost;
static double ExtraCostCombinedMIPS32(const int* const X, const int* const Y,
int length) {
int i, temp0, temp1, temp2, temp3;
int* pX = (int*)&X[4];
int* pY = (int*)&Y[4];
const int* LoopEnd = (int*)&X[length];
__asm__ volatile(
"mult $zero, $zero \n\t"
"xor %[i], %[i], %[i] \n\t"
"beq %[pX], %[LoopEnd], 2f \n\t"
"1: \n\t"
"lw %[temp0], 0(%[pX]) \n\t"
"lw %[temp1], 0(%[pY]) \n\t"
"lw %[temp2], 4(%[pX]) \n\t"
"lw %[temp3], 4(%[pY]) \n\t"
"addiu %[i], %[i], 1 \n\t"
"addu %[temp0], %[temp0], %[temp1] \n\t"
"addu %[temp2], %[temp2], %[temp3] \n\t"
"addiu %[pX], %[pX], 8 \n\t"
"addiu %[pY], %[pY], 8 \n\t"
"madd %[i], %[temp0] \n\t"
"madd %[i], %[temp2] \n\t"
"bne %[pX], %[LoopEnd], 1b \n\t"
"2: \n\t"
"mfhi %[temp0] \n\t"
"mflo %[temp1] \n\t"
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1),
[temp2]"=&r"(temp2), [temp3]"=&r"(temp3),
[i]"=&r"(i), [pX]"+r"(pX), [pY]"+r"(pY)
: [LoopEnd]"r"(LoopEnd)
: "memory", "hi", "lo"
);
return (double)((int64_t)temp0 << 32 | temp1);
}
#endif // WEBP_USE_MIPS32
//------------------------------------------------------------------------------
@ -104,5 +199,7 @@ void VP8LDspInitMIPS32(void) {
#if defined(WEBP_USE_MIPS32)
VP8LFastSLog2Slow = FastSLog2SlowMIPS32;
VP8LFastLog2Slow = FastLog2SlowMIPS32;
VP8LExtraCost = ExtraCostMIPS32;
VP8LExtraCostCombined = ExtraCostCombinedMIPS32;
#endif // WEBP_USE_MIPS32
}