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conv24
2017 Mar 24
2
SLP regression on SystemZ
Hi,
I have come across a major regression resulting after SLP vectorization
(+18% on SystemZ, just for enabling SLP). This all relates to one
particular very hot loop.
Scalar code:
%conv252 = zext i16 %110 to i64
%conv254 = zext i16 %111 to i64
%sub255 = sub nsw i64 %conv252, %conv254
... repeated
SLP output:
%101 = zext <16 x i16> %100 to <16 x i64>
%104 = zext <16 x i16> %103 to <16 x i64>
%105 = sub nsw <16 x i64> %101, %104
%106 = trunc <16 x i64> %105 to &l...