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[X86] Fix the (shl (and (setcc_c), c1), c2) -> (and setcc_c, (c1 << c2)) fold
authorDavid Majnemer <david.majnemer@gmail.com>
Thu, 20 Aug 2015 09:00:56 +0000 (09:00 +0000)
committerDavid Majnemer <david.majnemer@gmail.com>
Thu, 20 Aug 2015 09:00:56 +0000 (09:00 +0000)
commitfa1aef3608ff69757a3aca53220abe1a76a4bd8e
treee7885b20f0ff83c91fbd52bd300a64eedf3f270ftree | snapshot
parent0299ff2d551e4b2c7e1703fed017a8de0f427b7fcommit | diff
[X86] Fix the (shl (and (setcc_c), c1), c2) -> (and setcc_c, (c1 << c2)) fold

We didn't check for the necessary preconditions before folding a
mask/shift into a single mask.

This fixes PR24516.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245544 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Target/X86/X86ISelLowering.cpp diff | blob | history
test/CodeGen/X86/setcc.ll diff | blob | history
C/C++ LLVM-based compilers that forbids OOTA behaviors