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Saves instructions on x86. Before #6426 vpaddw %ymm0, %ymm1, %ymm1 vpsrlw $8, %ymm1, %ymm2 vpaddw %ymm2, %ymm1, %ymm1 vpsrlw $8, %ymm1, %ymm1 After #6426 vpsrlw $7, %ymm2, %ymm3 vpand %ymm0, %ymm3, %ymm3 vpsrlw $8, %ymm2, %ymm4 vpaddw %ymm2, %ymm4, %ymm2 vpaddw %ymm3, %ymm2, %ymm2 vpsrlw $7, %ymm2, %ymm3 vpand %ymm0, %ymm3, %ymm3 vpsrlw $8, %ymm2, %ymm2 vpaddw %ymm2, %ymm3, %ymm2 vpand %ymm1, %ymm2, %ymm2 This PR: vpaddw %ymm0, %ymm3, %ymm3 vpmulhuw %ymm1, %ymm3, %ymm3 vpsrlw $7, %ymm3, %ymm3
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LGTM |
dsharletg
approved these changes
Nov 19, 2021
vksnk
approved these changes
Nov 19, 2021
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Saves instructions on x86. For the division by 255 in an 8-bit lerp we get:
Before #6426
After #6426
This PR: