forked from OSchip/llvm-project
d065c81164
Summary: Normally TargetLowering::expandFixedPointMul would handle SMULFIXSAT with scale zero by using an SMULO to compute the product and determine if saturation is needed (if overflow happened). But if SMULO isn't custom/legal it falls through and uses the same technique, using MULHS/SMUL_LOHI, as used for non-zero scales. Problem was that when checking for overflow (handling saturation) when not using MULO we did not expect to find a zero scale. So we ended up in an assertion when doing APInt::getLowBitsSet(VTSize, Scale - 1) This patch fixes the problem by adding a new special case for how saturation is computed when scale is zero. Reviewers: RKSimon, bevinh, leonardchan, spatel Reviewed By: RKSimon Subscribers: wuzish, nemanjai, hiraditya, MaskRay, jsji, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D67071 llvm-svn: 371309 |
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README.txt
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