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InstSimplify: Optimize signed icmp of -(zext V)
authorDavid Majnemer <david.majnemer@gmail.com>
Wed, 14 May 2014 20:16:28 +0000 (20:16 +0000)
committerDavid Majnemer <david.majnemer@gmail.com>
Wed, 14 May 2014 20:16:28 +0000 (20:16 +0000)
commitcd237ed5853bda1dab27323236119e4342a19860
treeae30d37e6dbf9018ec09943c2628b04a3c861973tree | snapshot
parente0776de2df9c47af5002cbc04354b52f3a1ee9b3commit | diff
InstSimplify: Optimize signed icmp of -(zext V)

Summary:
We know that -(zext V) will always be <= zero, simplify signed icmps
that have these.

Uncovered using http://www.cs.utah.edu/~regehr/souper/

Reviewers: nicholas

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D3754

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208809 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Analysis/InstructionSimplify.cpp diff | blob | history
test/Transforms/InstSimplify/compare.ll diff | blob | history
C/C++ LLVM-based compilers that forbids OOTA behaviors