Do not use hadd_pd to implement reduce_add #1108
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It's generally slower than the sse2 version due to a latency of 5 (!) for hadd_pd. Related to #1107
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Forwarding to sse is actually faster. Related to #1107
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@DiamonDinoia : why did you guarded the code here: 174c475#diff-c4f5d7f47f45c737cc1723af31069217834daf7da679a0b4ff255a4a6ae73c83R1413 this "intrinsic" seems to be standard - and it passes our validation without the guard. |
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I see, I thought it was an icc only intrinsic from the way it was used in Agner's vcl. Altough, I have been using fine on any compiler. |
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Great. I'm going to merge this patchset then. Would you mind doing the same investigation for single precision float? |
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Thanks for merging this! Sure, I will have a look next week when I have a moment. Would you mind considering the API I was suggesting for reducing interleaved complex? |
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It's generally slower than the sse2 version due to a latency of 5 (!) for hadd_pd.
Related to #1107