Added special consideration for instrumentation strategy
llvm-svn: 7208
diff --git a/llvm/lib/Target/Sparc/SparcInternals.h b/llvm/lib/Target/Sparc/SparcInternals.h
index 47885a4..2cd54b2 100644
--- a/llvm/lib/Target/Sparc/SparcInternals.h
+++ b/llvm/lib/Target/Sparc/SparcInternals.h
@@ -447,6 +447,10 @@
return MachineRegClassArr[RegClassID]->isRegVolatile(Reg);
}
+ inline bool modifiedByCall(int RegClassID, int Reg) const {
+ return MachineRegClassArr[RegClassID]->modifiedByCall(Reg);
+ }
+
// Get the register type for a register identified different ways.
int getRegType(const Type* type) const;
int getRegType(const LiveRange *LR) const;
diff --git a/llvm/lib/Target/Sparc/SparcRegClassInfo.h b/llvm/lib/Target/Sparc/SparcRegClassInfo.h
index 50cccb6..38b81b3 100644
--- a/llvm/lib/Target/Sparc/SparcRegClassInfo.h
+++ b/llvm/lib/Target/Sparc/SparcRegClassInfo.h
@@ -25,6 +25,10 @@
return (Reg < (int)StartOfNonVolatileRegs);
}
+ inline bool modifiedByCall(int Reg) const {
+ return Reg==(int)ModifiedByCall;
+ }
+
enum { // colors possible for a LR (in preferred order)
// --- following colors are volatile across function calls
// %g0 can't be used for coloring - always 0
@@ -61,6 +65,8 @@
StartOfNonVolatileRegs = l0,
StartOfAllRegs = o0,
+
+ ModifiedByCall = o7,
};
const char * const getRegName(unsigned reg) const;
diff --git a/llvm/lib/Target/Sparc/SparcRegInfo.cpp b/llvm/lib/Target/Sparc/SparcRegInfo.cpp
index e1eb148..42b9d10 100644
--- a/llvm/lib/Target/Sparc/SparcRegInfo.cpp
+++ b/llvm/lib/Target/Sparc/SparcRegInfo.cpp
@@ -1182,6 +1182,15 @@
CallArgsDescriptor* argDesc = CallArgsDescriptor::get(CallMI);
+ //if the call is to a instrumentation function, do not
+ //insert save and restore instructions
+ //the instrumentation function takes care of
+ //save restore for volatile regs
+ bool isLLVMFirstTrigger = false;
+ const Function *calledFunction = argDesc->getCallInst()->getCalledFunction();
+ if(calledFunction && calledFunction->getName() == "llvm_first_trigger")
+ isLLVMFirstTrigger = true;
+
// Now check if the call has a return value (using argDesc) and if so,
// find the LR of the TmpInstruction representing the return value register.
// (using the last or second-last *implicit operand* of the call MI).
@@ -1228,6 +1237,11 @@
if ( isRegVolatile(RCID, Color) ) {
+ //if the function is special LLVM function,
+ //And the register is not modified by call, don't save and restore
+ if(isLLVMFirstTrigger && !modifiedByCall(RCID, Color))
+ continue;
+
// if the value is in both LV sets (i.e., live before and after
// the call machine instruction)