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Fix the constant evaluator for AltiVec-style vector literals so that the 

vector is filled with the given constant;  we were just initializing the
first element.

llvm-svn: 105824
This commit is contained in:
John McCall 2010-06-11 17:54:15 +00:00
parent b86a6b830e
commit 875679eea0
2 changed files with 38 additions and 13 deletions
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47
clang/lib/AST/ExprConstant.cpp
View File

@ -746,25 +746,46 @@ VectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) {
QualType EltTy = VT->getElementType();
llvm::SmallVector<APValue, 4> Elements;
for (unsigned i = 0; i < NumElements; i++) {
// If a vector is initialized with a single element, that value
// becomes every element of the vector, not just the first.
// This is the behavior described in the IBM AltiVec documentation.
if (NumInits == 1) {
APValue InitValue;
if (EltTy->isIntegerType()) {
llvm::APSInt sInt(32);
if (i < NumInits) {
if (!EvaluateInteger(E->getInit(i), sInt, Info))
return APValue();
} else {
sInt = Info.Ctx.MakeIntValue(0, EltTy);
}
Elements.push_back(APValue(sInt));
if (!EvaluateInteger(E->getInit(0), sInt, Info))
return APValue();
InitValue = APValue(sInt);
} else {
llvm::APFloat f(0.0);
if (i < NumInits) {
if (!EvaluateFloat(E->getInit(i), f, Info))
return APValue();
if (!EvaluateFloat(E->getInit(0), f, Info))
return APValue();
InitValue = APValue(f);
}
for (unsigned i = 0; i < NumElements; i++) {
Elements.push_back(InitValue);
}
} else {
for (unsigned i = 0; i < NumElements; i++) {
if (EltTy->isIntegerType()) {
llvm::APSInt sInt(32);
if (i < NumInits) {
if (!EvaluateInteger(E->getInit(i), sInt, Info))
return APValue();
} else {
sInt = Info.Ctx.MakeIntValue(0, EltTy);
}
Elements.push_back(APValue(sInt));
} else {
f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy));
llvm::APFloat f(0.0);
if (i < NumInits) {
if (!EvaluateFloat(E->getInit(i), f, Info))
return APValue();
} else {
f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy));
}
Elements.push_back(APValue(f));
}
Elements.push_back(APValue(f));
}
}
return APValue(&Elements[0], Elements.size());

4
clang/test/CodeGen/altivec.c Normal file
View File

@ -0,0 +1,4 @@
// RUN: %clang_cc1 -faltivec -triple powerpc-unknown-unknown -emit-llvm %s -o - | FileCheck %s
// CHECK: @test0 = global <4 x i32> <i32 1, i32 1, i32 1, i32 1>
vector int test0 = (vector int)(1);