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d8f6dbb9 · Richard Stallman · 94a58076 · d8f6dbb9
Commit d8f6dbb9 authored May 13, 1992 by Richard Stallman
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Showing with 6 additions and 2 deletions

gcc/fold-const.c
+6 -2

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--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -2748,9 +2748,13 @@ fold (expr)
 	return convert (TREE_TYPE (t), TREE_OPERAND (TREE_OPERAND (t, 0), 0));

      if (TREE_CODE (TREE_OPERAND (t, 0)) == MODIFY_EXPR
-	  && TREE_CONSTANT (TREE_OPERAND (TREE_OPERAND (t, 0), 1)))
+	  && TREE_CONSTANT (TREE_OPERAND (TREE_OPERAND (t, 0), 1))
+	  /* Detect assigning a bitfield.  */
+	  && !(TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)) == COMPONENT_REF
+	       && DECL_BIT_FIELD (TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (t, 0), 0), 1))))
 	{
-	  /* Don't leave an assignment inside a conversion.  */
+	  /* Don't leave an assignment inside a conversion
+	     unless assiging a bitfield.  */
 	  tree prev = TREE_OPERAND (t, 0);
 	  TREE_OPERAND (t, 0) = TREE_OPERAND (prev, 1);
 	  /* First do the assignment, then return converted constant.  */