Implement va_start.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18011 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Sparc/SparcV8ISelSimple.cpp b/lib/Target/Sparc/SparcV8ISelSimple.cpp
index bfb0c3e..4f40ae0 100644
--- a/lib/Target/Sparc/SparcV8ISelSimple.cpp
+++ b/lib/Target/Sparc/SparcV8ISelSimple.cpp
@@ -34,6 +34,7 @@
TargetMachine &TM;
MachineFunction *F; // The function we are compiling into
MachineBasicBlock *BB; // The current MBB we are compiling
+ int VarArgsOffset; // Offset from fp for start of varargs area
std::map<Value*, unsigned> RegMap; // Mapping between Val's and SSA Regs
@@ -445,6 +446,12 @@
assert (0 && "Unknown class?!");
}
}
+
+ // If the function takes variable number of arguments, remember the fp
+ // offset for the start of the first vararg value... this is used to expand
+ // llvm.va_start.
+ if (LF->getFunctionType ()->isVarArg ())
+ VarArgsOffset = ArgOffset;
}
void V8ISel::SelectPHINodes() {
@@ -1341,6 +1348,10 @@
if (CallInst *CI = dyn_cast<CallInst>(I++))
if (Function *F = CI->getCalledFunction())
switch (F->getIntrinsicID()) {
+ case Intrinsic::vastart:
+ case Intrinsic::vacopy:
+ case Intrinsic::vaend:
+ // We directly implement these intrinsics
case Intrinsic::not_intrinsic: break;
default:
// All other intrinsic calls we must lower.
@@ -1360,8 +1371,11 @@
default:
std::cerr << "Sorry, unknown intrinsic function call:\n" << CI; abort ();
- case Intrinsic::vastart:
- std::cerr << "Sorry, va_start intrinsic still unsupported:\n" << CI; abort ();
+ case Intrinsic::vastart: {
+ unsigned DestReg = getReg (CI);
+ BuildMI (BB, V8::ADDri, 2, DestReg).addReg (V8::FP).addSImm (VarArgsOffset);
+ return;
+ }
case Intrinsic::vaend:
// va_end is a no-op on SparcV8.