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[NVPTX] Properly handle bitcast ConstantExpr when checking for the alignment of function parameters

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194410 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Justin Holewinski
2013-11-11 19:28:19 +00:00
parent 0df3ce333b
commit 07a5d3dc3d
2 changed files with 64 additions and 13 deletions
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51
lib/Target/NVPTX/NVPTXISelLowering.cpp
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@@ -471,22 +471,47 @@ NVPTXTargetLowering::getArgumentAlignment(SDValue Callee,
Type *Ty,
unsigned Idx) const {
const DataLayout *TD = getDataLayout();
unsigned align = 0;
GlobalAddressSDNode *Func = dyn_cast<GlobalAddressSDNode>(Callee.getNode());
unsigned Align = 0;
const Value *DirectCallee = CS->getCalledFunction();
if (Func) { // direct call
assert(CS->getCalledFunction() &&
"direct call cannot find callee");
if (!llvm::getAlign(*(CS->getCalledFunction()), Idx, align))
align = TD->getABITypeAlignment(Ty);
}
else { // indirect call
const CallInst *CallI = dyn_cast<CallInst>(CS->getInstruction());
if (!llvm::getAlign(*CallI, Idx, align))
align = TD->getABITypeAlignment(Ty);
if (!DirectCallee) {
// We don't have a direct function symbol, but that may be because of
// constant cast instructions in the call.
const Instruction *CalleeI = CS->getInstruction();
assert(CalleeI && "Call target is not a function or derived value?");
// With bitcast'd call targets, the instruction will be the call
if (isa<CallInst>(CalleeI)) {
// Check if we have call alignment metadata
if (llvm::getAlign(*cast<CallInst>(CalleeI), Idx, Align))
return Align;
const Value *CalleeV = cast<CallInst>(CalleeI)->getCalledValue();
// Ignore any bitcast instructions
while(isa<ConstantExpr>(CalleeV)) {
const ConstantExpr *CE = cast<ConstantExpr>(CalleeV);
if (!CE->isCast())
break;
// Look through the bitcast
CalleeV = cast<ConstantExpr>(CalleeV)->getOperand(0);
}
// We have now looked past all of the bitcasts. Do we finally have a
// Function?
if (isa<Function>(CalleeV))
DirectCallee = CalleeV;
}
}
return align;
// Check for function alignment information if we found that the
// ultimate target is a Function
if (DirectCallee)
if (llvm::getAlign(*cast<Function>(DirectCallee), Idx, Align))
return Align;
// Call is indirect or alignment information is not available, fall back to
// the ABI type alignment
return TD->getABITypeAlignment(Ty);
}
SDValue NVPTXTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,