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Fix PR4975. Avoid referencing empty vector.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99840 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-03-29 21:27:30 +00:00
parent 0ea86bc411
commit 8e36a5c960
2 changed files with 21 additions and 2 deletions
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6
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -6051,8 +6051,10 @@ void SelectionDAGISel::LowerArguments(BasicBlock *LLVMBB) {
}
if (!I->use_empty()) {
SDValue Res = DAG.getMergeValues(&ArgValues[0], NumValues,
SDB->getCurDebugLoc());
SDValue Res;
if (!ArgValues.empty())
Res = DAG.getMergeValues(&ArgValues[0], NumValues,
SDB->getCurDebugLoc());
SDB->setValue(I, Res);
// If this argument is live outside of the entry block, insert a copy from

17
test/CodeGen/Generic/2010-ZeroSizedArg.ll Normal file
View File

@ -0,0 +1,17 @@
; RUN: llc < %s
; PR4975
%0 = type <{ [0 x i32] }>
%union.T0 = type { }
@.str = private constant [1 x i8] c" "
define arm_apcscc void @t(%0) nounwind {
entry:
%arg0 = alloca %union.T0
%1 = bitcast %union.T0* %arg0 to %0*
store %0 %0, %0* %1, align 1
ret void
}
declare arm_apcscc i32 @printf(i8*, ...)