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This repository was archived by the owner on Feb 5, 2019. It is now read-only.
[X86] Fix AvoidStoreForwardingBlocks pass for negative displacements
Fixes https://bugs.llvm.org/show_bug.cgi?id=39926.
The size of the first copy was computed as
std::abs(std::abs(LdDisp2) - std::abs(LdDisp1)), which results in
skipped bytes if the signs of LdDisp2 and LdDisp1 differ. As far as
I can see, this should just be LdDisp2 - LdDisp1. The case where
LdDisp1 > LdDisp2 is already handled in the code above, in which case
LdDisp2 is set to LdDisp1 and this subtraction will evaluate to
Size1 = 0, which is the correct value to skip an overlapping copy.
Differential Revision: https://reviews.llvm.org/D55485
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348750 91177308-0d34-0410-b5e6-96231b3b80d8
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