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simpler, faster

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This commit is contained in:
Ryan Oldenburg 2022-06-20 22:19:11 -05:00
parent 3c769291af
commit 82881ae75b
1 changed files with 15 additions and 15 deletions
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30
src/pixie/images.nim
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@ -262,7 +262,7 @@ proc minifyBy2*(image: Image, power = 1): Image {.raises: [PixieError].} =
when defined(amd64) and allowSimd:
let
oddMask = mm_set1_epi16(cast[int16](0xff00))
first32 = cast[M128i]([uint32.high, 0, 0, 0])
mergedMask = mm_set_epi32(0, uint32.high, 0, uint32.high)
for _ in countup(0, resultEvenWidth - 4, 2):
let
top = mm_loadu_si128(src.data[src.dataIndex(x * 2, y * 2 + 0)].addr)
@ -271,36 +271,36 @@ proc minifyBy2*(image: Image, power = 1): Image {.raises: [PixieError].} =
btmShifted = mm_srli_si128(btm, 4)
topEven = mm_andnot_si128(oddMask, top)
topOdd = mm_srli_epi16(mm_and_si128(top, oddMask), 8)
topOdd = mm_srli_epi16(top, 8)
btmEven = mm_andnot_si128(oddMask, btm)
btmOdd = mm_srli_epi16(mm_and_si128(btm, oddMask), 8)
btmOdd = mm_srli_epi16(btm, 8)
topShiftedEven = mm_andnot_si128(oddMask, topShifted)
topShiftedOdd = mm_srli_epi16(mm_and_si128(topShifted, oddMask), 8)
topShiftedOdd = mm_srli_epi16(topShifted, 8)
btmShiftedEven = mm_andnot_si128(oddMask, btmShifted)
btmShiftedOdd = mm_srli_epi16(mm_and_si128(btmShifted, oddMask), 8)
btmShiftedOdd = mm_srli_epi16(btmShifted, 8)
topAddedEven = mm_add_epi16(topEven, topShiftedEven)
btmAddedEven = mm_add_epi16(btmEven, btmShiftedEven)
topAddedOdd = mm_add_epi16(topOdd, topShiftedOdd)
bottomAddedOdd = mm_add_epi16(btmOdd, btmShiftedOdd)
btmAddedOdd = mm_add_epi16(btmOdd, btmShiftedOdd)
addedEven = mm_add_epi16(topAddedEven, btmAddedEven)
addedOdd = mm_add_epi16(topAddedOdd, bottomAddedOdd)
addedOdd = mm_add_epi16(topAddedOdd, btmAddedOdd)
addedEvenDiv4 = mm_srli_epi16(addedEven, 2)
addedOddDiv4 = mm_srli_epi16(addedOdd, 2)
merged = mm_or_si128(addedEvenDiv4, mm_slli_epi16(addedOddDiv4, 8))
# Merged has the correct values for the next two pixels at
# index 0 and 2 so mask the others out and shift 0 and 2 into
# position and store
masked = mm_and_si128(merged, mergedMask)
# merged [0, 1, 2, 3] has the correct values for the next two pixels
# at index 0 and 2 so shift those into position and store
zero = mm_and_si128(merged, first32)
two = mm_and_si128(mm_srli_si128(merged, 8), first32)
zeroTwo = mm_or_si128(zero, mm_slli_si128(two, 4))
mm_storeu_si128(result.data[result.dataIndex(x, y)].addr, zeroTwo)
mm_storeu_si128(
result.data[result.dataIndex(x, y)].addr,
mm_shuffle_epi32(masked, MM_SHUFFLE(0, 0, 2, 0))
)
x += 2
for x in x ..< resultEvenWidth: