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6 Commits

Author SHA1 Message Date
Andrea Di Biagio
b2f47c6a34 Teach DAGCombiner how to fold a SIGN_EXTEND_INREG of a BUILD_VECTOR of 
ConstantSDNodes (or UNDEFs) into a simple BUILD_VECTOR.

For example, given the following sequence of dag nodes:

  i32 C = Constant<1>
  v4i32 V = BUILD_VECTOR C, C, C, C
  v4i32 Result = SIGN_EXTEND_INREG V, ValueType:v4i1

The SIGN_EXTEND_INREG node can be folded into a build_vector since
the vector in input is a BUILD_VECTOR of constants.

The optimized sequence is:

  i32 C = Constant<-1>
  v4i32 Result = BUILD_VECTOR C, C, C, C



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198084 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-12-27 20:20:28 +00:00
Nadav Rotem
f8db4478f8 Revert r169638 because it broke Mesa llvmpipe tests. 
Fix PR15239.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175985 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-02-24 07:09:35 +00:00
Nadav Rotem
af59e9adbd When we use the BLEND instruction that uses the MSB as a mask, we can remove 
the VSRI instruction before it since it does not affect the MSB.

Thanks Craig Topper for suggesting this.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169638 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-12-07 21:43:11 +00:00
Nadav Rotem
c2d064f028 Revert 147426 because it caused pr11696. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147485 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-03 22:19:42 +00:00
Nadav Rotem
a46f35d3d6 Optimize the sequence blend(sign_extend(x)) to blend(shl(x)) since SSE blend instructions only look at the highest bit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147426 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-02 08:05:46 +00:00
Nadav Rotem
6059b83695 PR11662. 
Promotion of the mask operand needs to be done using PromoteTargetBoolean, and not padded with garbage.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147309 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-28 13:08:20 +00:00