Fix assert on constant expression evaluation of floating point increment.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143320 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 4 insertions, 7 deletions

diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index f33827ff7c..bf428aaacc 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -2529,17 +2529,13 @@ bool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) {
 }
 
 bool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) {
-  if (E->getOpcode() == UO_Deref)
-    return false;
-
-  if (!EvaluateFloat(E->getSubExpr(), Result, Info))
-    return false;
-
   switch (E->getOpcode()) {
   default: return false;
   case UO_Plus:
-    return true;
+    return EvaluateFloat(E->getSubExpr(), Result, Info);
   case UO_Minus:
+    if (!EvaluateFloat(E->getSubExpr(), Result, Info))
+      return false;
     Result.changeSign();
     return true;
   }
diff --git a/test/Sema/const-eval.c b/test/Sema/const-eval.c
index ee55ca871f..8cfa7ea6f8 100644
--- a/test/Sema/const-eval.c
+++ b/test/Sema/const-eval.c
@@ -88,6 +88,7 @@ void rdar8875946() {
 }
 
 double d = (d = 0.0); // expected-error {{not a compile-time constant}}
+double d2 = ++d; // expected-error {{not a compile-time constant}}
 
 int n = 2;
 int intLvalue[*(int*)((long)&n ?: 1)] = { 1, 2 }; // expected-error {{variable length array}}