implement shufflevector.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47815 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 5e98798..c13cdf5 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -191,10 +191,13 @@
// Don't inline a load across a store or other bad things!
return false;
- // Must not be used in inline asm or extractelement.
- if (I.hasOneUse() &&
- (isInlineAsm(*I.use_back()) || isa<ExtractElementInst>(I)))
- return false;
+ // Must not be used in inline asm, extractelement, or shufflevector.
+ if (I.hasOneUse()) {
+ const Instruction &User = cast<Instruction>(*I.use_back());
+ if (isInlineAsm(User) || isa<ExtractElementInst>(User) ||
+ isa<ShuffleVectorInst>(User))
+ return false;
+ }
// Only inline instruction it if it's use is in the same BB as the inst.
return I.getParent() == cast<Instruction>(I.use_back())->getParent();
@@ -256,6 +259,7 @@
void visitInsertElementInst(InsertElementInst &I);
void visitExtractElementInst(ExtractElementInst &I);
+ void visitShuffleVectorInst(ShuffleVectorInst &SVI);
void visitInstruction(Instruction &I) {
cerr << "C Writer does not know about " << I;
@@ -3051,6 +3055,36 @@
Out << "]";
}
+void CWriter::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
+ Out << "(";
+ printType(Out, SVI.getType());
+ Out << "){ ";
+ const VectorType *VT = SVI.getType();
+ unsigned NumElts = VT->getNumElements();
+ const Type *EltTy = VT->getElementType();
+
+ for (unsigned i = 0; i != NumElts; ++i) {
+ if (i) Out << ", ";
+ int SrcVal = SVI.getMaskValue(i);
+ if ((unsigned)SrcVal >= NumElts*2) {
+ Out << " 0/*undef*/ ";
+ } else {
+ Value *Op = SVI.getOperand((unsigned)SrcVal >= NumElts);
+ if (isa<Instruction>(Op)) {
+ // Do an extractelement of this value from the appropriate input.
+ Out << "((";
+ printType(Out, PointerType::getUnqual(EltTy));
+ Out << ")(&" << GetValueName(Op)
+ << "))[" << (SrcVal & NumElts-1) << "]";
+ } else if (isa<ConstantAggregateZero>(Op) || isa<UndefValue>(Op)) {
+ Out << "0";
+ } else {
+ printConstant(cast<ConstantVector>(Op)->getOperand(SrcVal & NumElts-1));
+ }
+ }
+ }
+ Out << "}";
+}
//===----------------------------------------------------------------------===//