llvm/test/CodeGen/X86, branch release_23

Merge from mainline.

2008-05-12T17:55:39Z

When transforming a vector_shuffle to a load, the base address must not be an undef. git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_23@50981 91177308-0d34-0410-b5e6-96231b3b80d8

Add nounwind.

2008-05-10T02:22:25Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50931 91177308-0d34-0410-b5e6-96231b3b80d8

If all sources of a PHI node are defined by an implicit_def, just emit an implicit_def instead of a copy.

2008-05-10T00:17:50Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50927 91177308-0d34-0410-b5e6-96231b3b80d8

Add a pattern to do move the low element of a v4f32 and zero extend the rest.

2008-05-09T23:37:55Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50922 91177308-0d34-0410-b5e6-96231b3b80d8

Handle a few more cases of folding load i64 into xmm and zero top bits.

2008-05-09T21:53:03Z

Note, some of the code will be moved into target independent part of DAG combiner in a subsequent patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50918 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify test.

2008-05-09T19:56:32Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50911 91177308-0d34-0410-b5e6-96231b3b80d8

Use movq to move low half of XMM register and zero-extend the rest.

2008-05-08T22:35:02Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50874 91177308-0d34-0410-b5e6-96231b3b80d8

Handle vector move / load which zero the destination register top bits (i.e. movd, movq, movss (addr), movsd (addr)) with X86 specific dag combine.

2008-05-08T00:57:18Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50838 91177308-0d34-0410-b5e6-96231b3b80d8

Add nounwind.

2008-05-07T22:59:08Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50837 91177308-0d34-0410-b5e6-96231b3b80d8

Yet another nasty spiller bug.

2008-05-07T00:49:28Z

%ecx = op store %cl, (addr) (addr) = op %al It's not safe to unfold the last operand and eliminate store even though %cl is marked kill. It's a sub-register use which means one of its super-register(s) may be used below. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50794 91177308-0d34-0410-b5e6-96231b3b80d8