* expmed.c (expand_divmod): Add comment.

From-SVN: r121519

* expmed.c (expand_divmod): Add comment.
From-SVN: r121519
093253be · Ian Lance Taylor · Ian Lance Taylor · 6d941be3 · 093253be · 093253be
Commit 093253be authored Feb 02, 2007 by Ian Lance Taylor Committed by Ian Lance Taylor Feb 02, 2007
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gcc/ChangeLog
+4 -0

gcc/expmed.c
+3 -0

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+2007-02-02  Ian Lance Taylor  <iant@google.com>
+
+	* expmed.c (expand_divmod): Add comment.
+
 2007-02-02  Kazu Hirata  <kazu@codesourcery.com>

 	* emit-rtl.c (renumber_insns): Remove.

--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -4176,6 +4176,9 @@ expand_divmod (int rem_flag, enum tree_code code, enum machine_mode mode,
 		HOST_WIDE_INT d = INTVAL (op1);
 		unsigned HOST_WIDE_INT abs_d;

+		/* Since d might be INT_MIN, we have to cast to
+		   unsigned HOST_WIDE_INT before negating to avoid
+		   undefined signed overflow.  */
 		abs_d = (d >= 0
 			 ? (unsigned HOST_WIDE_INT) d
 			 : - (unsigned HOST_WIDE_INT) d);