From 59e8b3bd7bf2c9efc8d9b74e98eee13684cfc75b Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Fri, 6 Aug 2010 10:14:59 +0000
Subject: Introduce implicit conversions between AltiVec vectors and GCC
 vectors, from Anton Yartsev!

llvm-svn: 110437
---
 clang/lib/Sema/SemaExpr.cpp | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

(limited to 'clang/lib/Sema/SemaExpr.cpp')

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 28b2e995375..46c5a65f75d 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -4731,13 +4731,18 @@ Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) {
   }
 
   if (lhsType->isVectorType() || rhsType->isVectorType()) {
-    // If we are allowing lax vector conversions, and LHS and RHS are both
-    // vectors, the total size only needs to be the same. This is a bitcast;
-    // no bits are changed but the result type is different.
-    if (getLangOptions().LaxVectorConversions &&
-        lhsType->isVectorType() && rhsType->isVectorType()) {
-      if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType))
+    if (lhsType->isVectorType() && rhsType->isVectorType()) {
+      // If we are allowing lax vector conversions, and LHS and RHS are both
+      // vectors, the total size only needs to be the same. This is a bitcast;
+      // no bits are changed but the result type is different.
+      if (getLangOptions().LaxVectorConversions &&
+         (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)))
         return IncompatibleVectors;
+
+      // Allow assignments of an AltiVec vector type to an equivalent GCC
+      // vector type and vice versa
+      if (Context.areCompatibleVectorTypes(lhsType, rhsType))
+        return Compatible;
     }
     return Incompatible;
   }
@@ -5012,6 +5017,13 @@ QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) {
     }
   }
 
+  // Handle the case of equivalent AltiVec and GCC vector types
+  if (lhsType->isVectorType() && rhsType->isVectorType() &&
+      Context.areCompatibleVectorTypes(lhsType, rhsType)) {
+    ImpCastExprToType(lex, rhsType, CastExpr::CK_BitCast);
+    return rhsType;
+  }
+
   // Canonicalize the ExtVector to the LHS, remember if we swapped so we can
   // swap back (so that we don't reverse the inputs to a subtract, for instance.
   bool swapped = false;
-- 
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