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- 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30635 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -283,7 +283,9 @@ public:
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}
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/// getCalleeSaveRegs - Return a null-terminated list of all of the
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/// callee-save registers on this target.
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/// callee-save registers on this target. The register should be in the
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/// order of desired callee-save stack frame offset. The first register is
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/// closed to the incoming stack pointer if stack grows down, and vice versa.
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virtual const unsigned* getCalleeSaveRegs() const = 0;
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/// getCalleeSaveRegClasses - Return a null-terminated list of the preferred
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@ -371,12 +373,16 @@ public:
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assert(0 && "Call Frame Pseudo Instructions do not exist on this target!");
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}
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/// processFunctionBeforeCalleeSaveScan - This method is called immediately
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/// before PrologEpilogInserter scans the physical registers used to determine
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/// what callee-save registers should be spilled. This method is optional.
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virtual void processFunctionBeforeCalleeSaveScan(MachineFunction &MF) const {
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}
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/// processFunctionBeforeFrameFinalized - This method is called immediately
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/// before the specified functions frame layout (MF.getFrameInfo()) is
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/// finalized. Once the frame is finalized, MO_FrameIndex operands are
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/// replaced with direct constants. This method is optional. The return value
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/// is the number of instructions added to (negative if removed from) the
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/// basic block
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/// replaced with direct constants. This method is optional.
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///
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virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
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}
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