From: Jim Wilson <wilson@gcc.gnu.org>
Date: Sun, 8 Aug 1993 22:48:15 +0000 (-0700)
Subject: (expand_increment): Call save_expr on inner expression if
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=591b15bb1c185e2364e4e2ed65d1bebb48fbfb2b;p=gcc.git

(expand_increment): Call save_expr on inner expression if
it is itself an increment expression.

From-SVN: r5115
---

diff --git a/gcc/expr.c b/gcc/expr.c
index bb31906f8c1..713f7d4eb77 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -6940,6 +6940,12 @@ expand_increment (exp, post)
 	  && (TREE_CODE (TREE_OPERAND (incremented, 0)) != INDIRECT_REF
 	      || DECL_BIT_FIELD (TREE_OPERAND (incremented, 1)))))
     incremented = stabilize_reference (incremented);
+  /* Nested *INCREMENT_EXPRs can happen in C++.  We must force innermost
+     ones into save exprs so that they don't accidentally get evaluated
+     more than once by the code below.  */
+  if (TREE_CODE (incremented) == PREINCREMENT_EXPR
+      || TREE_CODE (incremented) == PREDECREMENT_EXPR)
+    incremented = save_expr (incremented);
 
   /* Compute the operands as RTX.
      Note whether OP0 is the actual lvalue or a copy of it: