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Timothy B. Terriberry authored
On x86 there is no PMULHRSD for use in the 32-bit transform versions, so the fastest approach is to just do a normal 32-bit multiply and manually shift and round. This requires keeping the constants in their reduced precision instead of always promoting them to Q15. Change-Id: I76339b5567da3f08f34882a707e0c93122991946
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