llvm/lib/Transforms at 6300a12e8b0cb91bbf0fcecf196312cea49ca35b - llvm

RPCS3/llvm

mirror of https://github.com/RPCS3/llvm.git synced 2026-07-21 19:25:26 -04:00

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Philip Reames 16ed7f8f59 [InstCombine] icmp eq/ne (gep inbounds P, Idx..), null -> icmp eq/ne P, null

This generalizes the isGEPKnownNonNull rule from ValueTracking to apply when we do not know if the base is non-null, and thus need to replace one condition with another.

The core notion is that since an inbounds GEP can only form null if the base pointer is null and the offset is zero. However, if the offset is non-zero, the the "inbounds" marker makes the result poison. Thus, we're free to ignore the case where the offset is non-zero. Similarly, there's no case under which a non-null base can result in a null result without generating poison.

Differential Revision: https://reviews.llvm.org/D66608



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369789 91177308-0d34-0410-b5e6-96231b3b80d8

2019-08-23 17:58:58 +00:00

AggressiveInstCombine

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

Coroutines

[llvm] Migrate llvm::make_unique to std::make_unique

2019-08-15 15:54:37 +00:00

Hello

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

InstCombine

[InstCombine] icmp eq/ne (gep inbounds P, Idx..), null -> icmp eq/ne P, null