clarify some node comments

[libfirm] / ir / opt / opt_osr.c

diff --git a/ir/opt/opt_osr.c b/ir/opt/opt_osr.c
index 569d9d0..cdab220 100644 (file)
--- a/ir/opt/opt_osr.c
+++ b/ir/opt/opt_osr.c
@@ -22,7 +22,6 @@
  * @brief   Operator Strength Reduction.
  * @date    12.5.2006
  * @author  Michael Beck
- * @version $Id$
  * @brief
  *  Implementation of the Operator Strength Reduction algorithm
  *  by Keith D. Cooper, L. Taylor Simpson, Christopher A. Vick.
@@ -46,6 +45,7 @@
 #include "set.h"
 #include "tv.h"
 #include "hashptr.h"
+#include "util.h"
 #include "irtools.h"
 #include "irloop_t.h"
 #include "array.h"
@@ -1155,6 +1155,12 @@ static ir_node *applyOneEdge(ir_node *iv, ir_node *rc, LFTR_edge *e, iv_env *env
                        panic("Unsupported opcode");
                }
 
+               if (tv == tarval_bad || tv_init == tarval_bad) {
+                       tarval_set_integer_overflow_mode(ovmode);
+                       DB((dbg, LEVEL_4, " = OVERFLOW"));
+                       return NULL;
+               }
+
                if (pscc->code == iro_Add) {
                        tv_end = tarval_add(tv, tv_incr);
                } else {
@@ -1164,7 +1170,7 @@ static ir_node *applyOneEdge(ir_node *iv, ir_node *rc, LFTR_edge *e, iv_env *env
 
                tarval_set_integer_overflow_mode(ovmode);
 
-               if (tv == tarval_bad || tv_init == tarval_bad || tv_end == tarval_bad) {
+               if (tv_end == tarval_bad) {
                        DB((dbg, LEVEL_4, " = OVERFLOW"));
                        return NULL;
                }