[PowerPC] Implement vec_xxsldwi builtin.
The vec_xxsldwi builtin is missing from altivec.h. This has been requested by
developers working on libvpx for VP9 support for Google.
The patch fixes PR: https://bugs.llvm.org/show_bug.cgi?id=32653
Differential Revision: https://reviews.llvm.org/D33236
llvm-svn: 303766
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index d1a3a9d..f3a04a6 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -8475,6 +8475,47 @@
auto RetTy = ConvertType(BIRetType);
return Builder.CreateBitCast(ShuffleCall, RetTy);
}
+
+ case PPC::BI__builtin_vsx_xxsldwi: {
+ ConstantInt *ArgCI = dyn_cast<ConstantInt>(Ops[2]);
+ assert(ArgCI && "Third argument must be a compile time constant");
+ unsigned Index = ArgCI->getZExtValue() & 0x3;
+ Ops[0] = Builder.CreateBitCast(Ops[0], llvm::VectorType::get(Int32Ty, 4));
+ Ops[1] = Builder.CreateBitCast(Ops[1], llvm::VectorType::get(Int32Ty, 4));
+
+ // Create a shuffle mask
+ unsigned ElemIdx0;
+ unsigned ElemIdx1;
+ unsigned ElemIdx2;
+ unsigned ElemIdx3;
+ if (getTarget().isLittleEndian()) {
+ // Little endian element N comes from element 8+N-Index of the
+ // concatenated wide vector (of course, using modulo arithmetic on
+ // the total number of elements).
+ ElemIdx0 = (8 - Index) % 8;
+ ElemIdx1 = (9 - Index) % 8;
+ ElemIdx2 = (10 - Index) % 8;
+ ElemIdx3 = (11 - Index) % 8;
+ } else {
+ // Big endian ElemIdx<N> = Index + N
+ ElemIdx0 = Index;
+ ElemIdx1 = Index + 1;
+ ElemIdx2 = Index + 2;
+ ElemIdx3 = Index + 3;
+ }
+
+ Constant *ShuffleElts[4] = {ConstantInt::get(Int32Ty, ElemIdx0),
+ ConstantInt::get(Int32Ty, ElemIdx1),
+ ConstantInt::get(Int32Ty, ElemIdx2),
+ ConstantInt::get(Int32Ty, ElemIdx3)};
+
+ Constant *ShuffleMask = llvm::ConstantVector::get(ShuffleElts);
+ Value *ShuffleCall =
+ Builder.CreateShuffleVector(Ops[0], Ops[1], ShuffleMask);
+ QualType BIRetType = E->getType();
+ auto RetTy = ConvertType(BIRetType);
+ return Builder.CreateBitCast(ShuffleCall, RetTy);
+ }
}
}