Add the intrinsic __builtin_convertvector

LLVM supports applying conversion instructions to vectors of the same number of
elements (fptrunc, fptosi, etc.) but there had been no way for a Clang user to
cause such instructions to be generated when using builtin vector types.

C-style casting on vectors is already defined in terms of bitcasts, and so
cannot be used for these conversions as well (without leading to a very
confusing set of semantics). As a result, this adds a __builtin_convertvector
intrinsic (patterned after the OpenCL __builtin_astype intrinsic). This is
intended to aid the creation of vector intrinsic headers that create generic IR
instead of target-dependent intrinsics (in other words, this is a generic
_mm_cvtepi32_ps). As noted in the documentation, the action of
__builtin_convertvector is defined in terms of the action of a C-style cast on
each vector element.

llvm-svn: 190915

1 files changed, 1 insertions, 0 deletions

diff --git a/clang/tools/libclang/RecursiveASTVisitor.h b/clang/tools/libclang/RecursiveASTVisitor.h
index 4d2b3a98409..b8e66d481b4 100644
--- a/clang/tools/libclang/RecursiveASTVisitor.h
+++ b/clang/tools/libclang/RecursiveASTVisitor.h
@@ -2239,6 +2239,7 @@ DEF_TRAVERSE_STMT(ParenExpr, { })
 DEF_TRAVERSE_STMT(ParenListExpr, { })
 DEF_TRAVERSE_STMT(PredefinedExpr, { })
 DEF_TRAVERSE_STMT(ShuffleVectorExpr, { })
+DEF_TRAVERSE_STMT(ConvertVectorExpr, { })
 DEF_TRAVERSE_STMT(StmtExpr, { })
 DEF_TRAVERSE_STMT(UnresolvedLookupExpr, {
   TRY_TO(TraverseNestedNameSpecifierLoc(S->getQualifierLoc()));