Commit Graph

5 Commits

Author SHA1 Message Date
Chris Lattner
7f23958aa4 fix PR5262.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84810 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-22 00:17:26 +00:00
Torok Edwin
0739bd0ab2 Fix PR5262: when folding select into PHI, make sure all operands are available
in the PHI's Basic Block. This uses a conservative approach, because we don't
have dominator info in instcombine.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84754 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-21 10:49:00 +00:00
Chris Lattner
4cb81bdd56 instcombine transforms vector loads that are only used by
extractelement operations into a bitcast of the pointer,
then a gep, then a scalar load.  Disable this when the vector
only has one element, because it leads to infinite loops in
instcombine (PR4908).

This transformation seems like a really bad idea to me, as it
will likely disable CSE of vector load/stores etc and can be
better done in the code generator when profitable.  This
goes all the way back to the first days of packed types,
r25299 specifically.

I'll let those people who care about the performance of vector
code decide what to do with this.





git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81185 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-08 03:44:51 +00:00
Chris Lattner
b9a4ddbbcd fix ComputeMaskedBits handling of zext/sext/trunc to work with vectors.
This fixes PR4905


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81174 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-08 00:13:52 +00:00
Chris Lattner
95afdfee82 fix a bug I introduced with my 'instcombine builder' refactoring
changes: SimplifyDemandedBits can't use the builder yet because it
has the wrong insertion point.  This fixes a crash building
MultiSource/Benchmarks/PAQ8p


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80537 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-31 04:36:22 +00:00