Changes in directory llvm/include/llvm/Target:
MRegisterInfo.h updated: 1.83 -> 1.84
---
Log message:
- Added a hook processFunctionBeforeCalleeSaveScn(). This is called by PEI just
before it determines which callee-save registers are to be spilled. This allows
the target to make changes such as forcing certain physical registers to be
spilled.
- Modified comments. It's important to note the order of registers in the array
returns by getCalleeSaveRegs() determines the order of callee save spill code.
---
Diffs of the changes: (+10 -4)
MRegisterInfo.h | 14 ++++++++++----
1 files changed, 10 insertions(+), 4 deletions(-)
Index: llvm/include/llvm/Target/MRegisterInfo.h
diff -u llvm/include/llvm/Target/MRegisterInfo.h:1.83
llvm/include/llvm/Target/MRegisterInfo.h:1.84
--- llvm/include/llvm/Target/MRegisterInfo.h:1.83 Wed Aug 23 19:21:32 2006
+++ llvm/include/llvm/Target/MRegisterInfo.h Wed Sep 27 19:07:19 2006
@@ -283,7 +283,9 @@
}
/// getCalleeSaveRegs - Return a null-terminated list of all of the
- /// callee-save registers on this target.
+ /// callee-save registers on this target. The register should be in the
+ /// order of desired callee-save stack frame offset. The first register is
+ /// closed to the incoming stack pointer if stack grows down, and vice versa.
virtual const unsigned* getCalleeSaveRegs() const = 0;
/// getCalleeSaveRegClasses - Return a null-terminated list of the preferred
@@ -371,12 +373,16 @@
assert(0 && "Call Frame Pseudo Instructions do not exist on this target!");
}
+ /// processFunctionBeforeCalleeSaveScan - This method is called immediately
+ /// before PrologEpilogInserter scans the physical registers used to
determine
+ /// what callee-save registers should be spilled. This method is optional.
+ virtual void processFunctionBeforeCalleeSaveScan(MachineFunction &MF) const {
+ }
+
/// processFunctionBeforeFrameFinalized - This method is called immediately
/// before the specified functions frame layout (MF.getFrameInfo()) is
/// finalized. Once the frame is finalized, MO_FrameIndex operands are
- /// replaced with direct constants. This method is optional. The return
value
- /// is the number of instructions added to (negative if removed from) the
- /// basic block
+ /// replaced with direct constants. This method is optional.
///
virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
}
_______________________________________________
llvm-commits mailing list
llvm-commits@cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
