search for: conv252

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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...