diff options
Diffstat (limited to 'llvm/lib/Target/Sparc/SparcRegInfo.cpp')
| -rw-r--r-- | llvm/lib/Target/Sparc/SparcRegInfo.cpp | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/llvm/lib/Target/Sparc/SparcRegInfo.cpp b/llvm/lib/Target/Sparc/SparcRegInfo.cpp index e1eb148f025..42b9d10b59f 100644 --- a/llvm/lib/Target/Sparc/SparcRegInfo.cpp +++ b/llvm/lib/Target/Sparc/SparcRegInfo.cpp @@ -1182,6 +1182,15 @@ UltraSparcRegInfo::insertCallerSavingCode 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 @@ UltraSparcRegInfo::insertCallerSavingCode 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) |
