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Fix va_arg for doubles. With this patch VAARG nodes always contain the

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correct alignment information, which simplifies ExpandRes_VAARG a bit.

The patch introduces a new alignment information to TargetLoweringInfo. This is
needed since the two natural candidates cannot be used:

* The 's' in target data: If this is set to the minimal alignment of any
  argument, getCallFrameTypeAlignment would return 4 for doubles on ARM for
  example.
* The getTransientStackAlignment method. It is possible for an architecture to
  have argument less aligned than what we maintain the stack pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108072 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2010-07-11 04:01:49 +00:00
parent 4f8e771ae8
commit cbeeae23c3
10 changed files with 57 additions and 11 deletions
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3
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -5672,7 +5672,8 @@ void SelectionDAGBuilder::visitVAStart(const CallInst &I) {
void SelectionDAGBuilder::visitVAArg(const VAArgInst &I) {
SDValue V = DAG.getVAArg(TLI.getValueType(I.getType()), getCurDebugLoc(),
getRoot(), getValue(I.getOperand(0)),
DAG.getSrcValue(I.getOperand(0)));
DAG.getSrcValue(I.getOperand(0)),
TLI.getTargetData()->getABITypeAlignment(I.getType()));
setValue(&I, V);
DAG.setRoot(V.getValue(1));
}