• Brian Kessler's avatar
    cmd/compile: intrinsify math/bits.Div on amd64 · 319787a5
    Brian Kessler authored
    Note that the intrinsic implementation panics separately for overflow and
    divide by zero, which matches the behavior of the pure go implementation.
    There is a modest performance improvement after intrinsic implementation.
    
    name     old time/op  new time/op  delta
    Div-4    53.0ns ± 1%  47.0ns ± 0%  -11.28%  (p=0.008 n=5+5)
    Div32-4  18.4ns ± 0%  18.5ns ± 1%     ~     (p=0.444 n=5+5)
    Div64-4  53.3ns ± 0%  47.5ns ± 4%  -10.77%  (p=0.008 n=5+5)
    
    Updates #28273
    
    Change-Id: Ic1688ecc0964acace2e91bf44ef16f5fb6b6bc82
    Reviewed-on: https://go-review.googlesource.com/c/144378
    Run-TryBot: Keith Randall <khr@golang.org>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarKeith Randall <khr@golang.org>
    319787a5
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