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Raw decoding optimization: Do operations using 16 bits where possible.

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This saves a few instructions that were being used to switch to 8-bit mode or mask values down to 8 bits.
This commit is contained in:
Stephen Heumann 2015-09-26 22:16:04 -05:00
parent f810cb3799
commit 3c069bc35d
1 changed files with 45 additions and 27 deletions
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72
raw.cc
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@ -108,28 +108,37 @@ void RawDraw (void) {
if (hRez == 640) {
initialLineDataPtr = lineDataPtr;
while (destPtr + 7 < finalDestPtr) { /* Unrolled loop */
*destPtr = bigcoltab640a[*(unsigned int*)lineDataPtr]
+ bigcoltab640b[((unsigned int*)lineDataPtr)[1]];
destPtr[1] = bigcoltab640a[((unsigned int*)lineDataPtr)[2]]
+ bigcoltab640b[((unsigned int*)lineDataPtr)[3]];
destPtr[2] = bigcoltab640a[((unsigned int*)lineDataPtr)[4]]
+ bigcoltab640b[((unsigned int*)lineDataPtr)[5]];
destPtr[3] = bigcoltab640a[((unsigned int*)lineDataPtr)[6]]
+ bigcoltab640b[((unsigned int*)lineDataPtr)[7]];
destPtr[4] = bigcoltab640a[((unsigned int*)lineDataPtr)[8]]
+ bigcoltab640b[((unsigned int*)lineDataPtr)[9]];
destPtr[5] = bigcoltab640a[((unsigned int*)lineDataPtr)[10]]
+ bigcoltab640b[((unsigned int*)lineDataPtr)[11]];
destPtr[6] = bigcoltab640a[((unsigned int*)lineDataPtr)[12]]
+ bigcoltab640b[((unsigned int*)lineDataPtr)[13]];
destPtr[7] = bigcoltab640a[((unsigned int*)lineDataPtr)[14]]
+ bigcoltab640b[((unsigned int*)lineDataPtr)[15]];
*(unsigned*)destPtr =
*(unsigned*)(bigcoltab640a + *(unsigned*)lineDataPtr)
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[1]);
*(unsigned*)(destPtr+1) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[2])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[3]);
*(unsigned*)(destPtr+2) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[4])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[5]);
*(unsigned*)(destPtr+3) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[6])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[7]);
*(unsigned*)(destPtr+4) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[8])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[9]);
*(unsigned*)(destPtr+5) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[10])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[11]);
*(unsigned*)(destPtr+6) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[12])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[13]);
* (destPtr+7) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[14])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[15]);
destPtr += 8;
lineDataPtr += 32;
}
while (destPtr < finalDestPtr) {
*(destPtr++) = bigcoltab640a[*(unsigned int*)lineDataPtr]
+ bigcoltab640b[((unsigned int*)lineDataPtr)[1]];
*(destPtr++) =
*(unsigned*)(bigcoltab640a + *(unsigned*)lineDataPtr)
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[1]);
lineDataPtr += 4;
}
/* Final byte to produce */
@ -149,19 +158,28 @@ void RawDraw (void) {
}
else { /* 320 mode */
while (destPtr + 7 < finalDestPtr) { /* Unrolled loop */
*destPtr = bigcoltab320[*(unsigned int*)lineDataPtr];
destPtr[1] = bigcoltab320[((unsigned int*)lineDataPtr)[1]];
destPtr[2] = bigcoltab320[((unsigned int*)lineDataPtr)[2]];
destPtr[3] = bigcoltab320[((unsigned int*)lineDataPtr)[3]];
destPtr[4] = bigcoltab320[((unsigned int*)lineDataPtr)[4]];
destPtr[5] = bigcoltab320[((unsigned int*)lineDataPtr)[5]];
destPtr[6] = bigcoltab320[((unsigned int*)lineDataPtr)[6]];
destPtr[7] = bigcoltab320[((unsigned int*)lineDataPtr)[7]];
*(unsigned*)destPtr =
*(unsigned*)(bigcoltab320 + *(unsigned*)lineDataPtr);
*(unsigned*)(destPtr+1) =
*(unsigned*)(bigcoltab320 + ((unsigned*)lineDataPtr)[1]);
*(unsigned*)(destPtr+2) =
*(unsigned*)(bigcoltab320 + ((unsigned*)lineDataPtr)[2]);
*(unsigned*)(destPtr+3) =
*(unsigned*)(bigcoltab320 + ((unsigned*)lineDataPtr)[3]);
*(unsigned*)(destPtr+4) =
*(unsigned*)(bigcoltab320 + ((unsigned*)lineDataPtr)[4]);
*(unsigned*)(destPtr+5) =
*(unsigned*)(bigcoltab320 + ((unsigned*)lineDataPtr)[5]);
*(unsigned*)(destPtr+6) =
*(unsigned*)(bigcoltab320 + ((unsigned*)lineDataPtr)[6]);
* (destPtr+7) =
*(unsigned*)(bigcoltab320 + ((unsigned*)lineDataPtr)[7]);
destPtr += 8;
lineDataPtr += 16;
}
while (destPtr < finalDestPtr) {
*(destPtr++) = bigcoltab320[*(unsigned int*)lineDataPtr];
*(destPtr++) =
*(unsigned*)(bigcoltab320 + *(unsigned*)lineDataPtr);
lineDataPtr += 2;
}
/* Final byte to produce */