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Author	SHA1	Message	Date
David Majnemer	76735fbd2e	IR: Fold away compares between GV GEPs and GVs A GEP of a non-weak global variable will not be equivalent to another non-weak global variable or a GEP of such a variable. Differential Revision: http://reviews.llvm.org/D4238 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212360 91177308-0d34-0410-b5e6-96231b3b80d8	2014-07-04 22:05:26 +00:00
David Majnemer	6c2e8874b0	InstCombine: Stop two transforms dueling InstCombineMulDivRem has: // Canonicalize (X+C1)CI -> XCI+C1CI. InstCombineAddSub has: // WX + YZ --> W (X+Z) iff W == Y These two transforms could fight with each other if C1CI would not fold away to something simpler than a ConstantExpr mul. The InstCombineMulDivRem transform only acted on ConstantInts until r199602 when it was changed to operate on all Constants in order to let it fire on ConstantVectors. To fix this, make this transform more careful by checking to see if we actually folded away C1CI. This fixes PR20079. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211258 91177308-0d34-0410-b5e6-96231b3b80d8	2014-06-19 07:14:33 +00:00

Author

SHA1

Message

Date

David Majnemer

76735fbd2e

IR: Fold away compares between GV GEPs and GVs

A GEP of a non-weak global variable will not be equivalent to another
non-weak global variable or a GEP of such a variable.

Differential Revision: http://reviews.llvm.org/D4238

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212360 91177308-0d34-0410-b5e6-96231b3b80d8

2014-07-04 22:05:26 +00:00

David Majnemer

6c2e8874b0

InstCombine: Stop two transforms dueling

InstCombineMulDivRem has:
// Canonicalize (X+C1)*CI -> X*CI+C1*CI.

InstCombineAddSub has:
// W*X + Y*Z --> W * (X+Z)  iff W == Y

These two transforms could fight with each other if C1*CI would not fold
away to something simpler than a ConstantExpr mul.

The InstCombineMulDivRem transform only acted on ConstantInts until
r199602 when it was changed to operate on all Constants in order to
let it fire on ConstantVectors.

To fix this, make this transform more careful by checking to see if we
actually folded away C1*CI.

This fixes PR20079.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211258 91177308-0d34-0410-b5e6-96231b3b80d8

2014-06-19 07:14:33 +00:00

2 Commits