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First part of varargs support: getting all varargs which could possibly

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be in registers into memory.

llvm-svn: 18006
This commit is contained in:
Brian Gaeke 2004-11-19 20:31:08 +00:00
parent bd1f2c8fce
commit e88367016a
1 changed files with 21 additions and 1 deletions
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22
lib/Target/SparcV8/SparcV8ISelSimple.cpp
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@ -343,10 +343,30 @@ void V8ISel::LoadArgumentsToVirtualRegs (Function *LF) {
}
}
// Copy args out of their incoming hard regs or stack slots into virtual regs.
const unsigned *IAREnd = &IncomingArgRegs[6];
const unsigned *IAR = &IncomingArgRegs[0];
unsigned ArgOffset = 68;
// Store registers onto stack if this is a varargs function.
// FIXME: This doesn't really pertain to "loading arguments into
// virtual registers", so it's not clear that it really belongs here.
// FIXME: We could avoid storing any args onto the stack that don't
// need to be in memory, because they come before the ellipsis in the
// parameter list (and thus could never be accessed through va_arg).
if (LF->getFunctionType ()->isVarArg ()) {
for (unsigned i = 0; i < 6; ++i) {
int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset);
assert (IAR != IAREnd
&& "About to dereference past end of IncomingArgRegs");
BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (0).addReg (*IAR++);
ArgOffset += 4;
}
// Reset the pointers now that we're done.
ArgOffset = 68;
IAR = &IncomingArgRegs[0];
}
// Copy args out of their incoming hard regs or stack slots into virtual regs.
for (Function::aiterator I = LF->abegin(), E = LF->aend(); I != E; ++I) {
Argument &A = *I;
unsigned ArgReg = getReg (A);