From be142b55ad704892e7d4d3cb6c115b46d5262bc8 Mon Sep 17 00:00:00 2001 From: Ryan Oldenburg Date: Sun, 31 Jul 2022 01:05:17 -0500 Subject: [PATCH] faster --- src/pixie/simd/neon.nim | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/src/pixie/simd/neon.nim b/src/pixie/simd/neon.nim index 93ca7a2..26c18ac 100644 --- a/src/pixie/simd/neon.nim +++ b/src/pixie/simd/neon.nim @@ -146,19 +146,25 @@ proc toPremultipliedAlphaNeon*(data: var seq[ColorRGBA | ColorRGBX]) {.simd.} = inc i p += 4 - template premultiply(c, a: uint8x8): uint8x8 = + template multiply(c, a: uint8x8): uint8x8 = let ca = vmull_u8(c, a) vraddhn_u16(ca, vrshrq_n_u16(ca, 8)) - let iterations = (data.len - i) div 8 + template multiply(c, a: uint8x16): uint8x16 = + vcombine_u8( + multiply(vget_low_u8(c), vget_low_u8(a)), + multiply(vget_high_u8(c), vget_high_u8(a)) + ) + + let iterations = (data.len - i) div 16 for _ in 0 ..< iterations: - var channels = vld4_u8(cast[pointer](p)) - channels.val[0] = premultiply(channels.val[0], channels.val[3]) - channels.val[1] = premultiply(channels.val[1], channels.val[3]) - channels.val[2] = premultiply(channels.val[2], channels.val[3]) - vst4_u8(cast[pointer](p), channels) - p += 32 - i += 8 * iterations + var channels = vld4q_u8(cast[pointer](p)) + channels.val[0] = multiply(channels.val[0], channels.val[3]) + channels.val[1] = multiply(channels.val[1], channels.val[3]) + channels.val[2] = multiply(channels.val[2], channels.val[3]) + vst4q_u8(cast[pointer](p), channels) + p += 64 + i += 16 * iterations for i in i ..< data.len: var c = data[i]