llvm/lib/CodeGen, branch release_23

Merge from mainline.

2008-05-12T19:46:27Z

Fix a missing break in the ISD::FLT_ROUNDS_ handling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_23@50989 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

Cosmetic changes:

2008-05-10T00:12:52Z

- Comment fixes. - Moar whitespace. - Made ivars "private" by default. No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50926 91177308-0d34-0410-b5e6-96231b3b80d8

Remove an evil vector bool. Cosmetic refactoring,

2008-05-09T23:28:24Z

no functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50921 91177308-0d34-0410-b5e6-96231b3b80d8

Rewrite tail merging algorithm to handle the

2008-05-09T21:24:35Z

case where there are multiple blocks with a large number of common tail instructions more efficiently (compile time optimization). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50916 91177308-0d34-0410-b5e6-96231b3b80d8

Get exception handling working again on 64 bit

2008-05-08T12:33:11Z

Darwin. This is a hack of course, but it does at least look at the right thing: gotpcrel means that this is already an offset, so an explicit offset is not needed (and wrong). I think this is good enough for the moment: Anton is working on something better. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50850 91177308-0d34-0410-b5e6-96231b3b80d8

Turn StripPointerCast() into a method

2008-05-07T22:54:15Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50836 91177308-0d34-0410-b5e6-96231b3b80d8

Output correct exception handling and frame info

2008-05-07T19:11:09Z

on x86-64 linux. This causes no regressions on 32 bit linux and 32 bit ppc. More tests pass on 64 bit ppc with no regressions. I didn't turn on eh on 64 bit linux because the intrinsics needed to compile the eh runtime aren't done yet. But if you turn it on and link with the mainline runtime then eh seems to work fine on x86-64 linux with this patch. Thanks to Dale for testing. The main point of the patch is that if you output that some object is encoded using 4 bytes you had better not output 8 bytes for it: the patch makes everything consistent. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50825 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

Fix a bug in the ComputeMaskedBits logic for multiply.

2008-05-07T00:35:55Z

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50793 91177308-0d34-0410-b5e6-96231b3b80d8