Add a floating point killer pass. This pass runs before register

allocaton on the X86 to add information to the machine code denoting
that our floating point stackifier cannot handle virtual point
register that are alive across basic blocks. This pass adds an
implicit def of all virtual floating point register at the end of each
basic block.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10446 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/Target/X86/X86.h b/lib/Target/X86/X86.h
index c474d18ead..35845fb038 100644
--- a/lib/Target/X86/X86.h
+++ b/lib/Target/X86/X86.h
@@ -44,6 +44,12 @@ FunctionPass *createX86SSAPeepholeOptimizerPass();
 ///
 FunctionPass *createX86PeepholeOptimizerPass();
 
+/// createX86FloatingPointKiller - This function returns a pass which
+/// kills every floating point register at the end of each basic block
+/// because our FloatingPointStackifier cannot handle them.
+///
+FunctionPass *createX86FloatingPointKillerPass();
+
 /// createX86FloatingPointStackifierPass - This function returns a pass which
 /// converts floating point register references and pseudo instructions into
 /// floating point stack references and physical instructions.