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476c0607dd
On some targets, like SPARC, forming overflow ops is only profitable if the math result is used: https://godbolt.org/z/DxSmdB This patch adds a new MathUsed parameter to allow the targets to make the decision and defaults to only allowing it if the math result is used. That is the conservative choice. This patch also updates AArch64ISelLowering, X86ISelLowering, ARMISelLowering.h, SystemZISelLowering.h to allow forming overflow ops if the math result is not used. On those targets using the overflow intrinsic for the overflow check only generates better code. Reviewers: nikic, RKSimon, lebedev.ri, spatel Reviewed By: lebedev.ri Differential Revision: https://reviews.llvm.org/D74722 |
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| Pass.h | ||
| PassAnalysisSupport.h | ||
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| PassSupport.h | ||