Chris Lattner 8529319568 Do extremely simple sinking of instructions when they are only used in a
successor block.  This turns cases like this:

x = a op b
if (c) {
  use x
}

into:

if (c) {
  x = a op b
  use x
}

This triggers 3965 times in spec, and is tested by
Regression/Transforms/InstCombine/sink_instruction.ll

This appears to expose a bug in the X86 backend for 177.mesa, which I'm
looking in to.

llvm-svn: 18677
2004-12-08 23:43:58 +00:00
..
2004-11-30 07:47:34 +00:00
2004-09-20 04:43:57 +00:00