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3 Commits

Author SHA1 Message Date
David Majnemer
ed297abb0a InstCombine: Don't assume that m_ZExt matches an Instruction 
m_ZExt might bind against a ConstantExpr instead of an Instruction.
Assuming this, using cast<Instruction>, results in InstCombine crashing.

Instead, introduce ZExtOperator to bridge both Instruction and
ConstantExpr ZExts.

This fixes PR21445.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221069 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-11-01 23:46:05 +00:00
Benjamin Kramer
0e6156a1a2 InstCombine: Disable umul.with.overflow recognition for vectors. 
It doesn't make a lot on most targets and the code isn't ready for it. PR20113.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211583 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-06-24 10:47:52 +00:00
Serge Pavlov
ea0ea63773 Recognize test for overflow in integer multiplication. 
If multiplication involves zero-extended arguments and the result is
compared as in the patterns:

    %mul32 = trunc i64 %mul64 to i32
    %zext = zext i32 %mul32 to i64
    %overflow = icmp ne i64 %mul64, %zext
or
    %overflow = icmp ugt i64 %mul64 , 0xffffffff

then the multiplication may be replaced by call to umul.with.overflow.
This change fixes PR4917 and PR4918.

Differential Revision: http://llvm-reviews.chandlerc.com/D2814


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206137 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-04-13 18:23:41 +00:00