PR optimization/8988

	* loop.c (maybe_eliminate_biv): Kill REG_EQUAL notes mentioning
	the biv when eliminating.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@60334 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 51f11f5..5269ecc 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2002-12-19  Eric Botcazou  <ebotcazou@libertysurf.fr>
+
+       PR optimization/8988
+       * loop.c (maybe_eliminate_biv): Kill REG_EQUAL notes mentioning
+       the biv when eliminating.
+
 2002-12-19  Devang Patel  <dpatel@apple.com>
        * gcc.c (struct default_compiler): Recognizes input file name with
        .CPP extension as C++ source files

diff --git a/gcc/loop.c b/gcc/loop.c
index b3a8d28..b0ce7cd 100644 (file)
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -8612,11 +8612,12 @@ maybe_eliminate_biv (loop, bl, eliminate_p, threshold, insn_count)
       enum rtx_code code = GET_CODE (p);
       basic_block where_bb = 0;
       rtx where_insn = threshold >= insn_count ? 0 : p;
+      rtx note;
 
       /* If this is a libcall that sets a giv, skip ahead to its end.  */
       if (GET_RTX_CLASS (code) == 'i')
        {
-         rtx note = find_reg_note (p, REG_LIBCALL, NULL_RTX);
+         note = find_reg_note (p, REG_LIBCALL, NULL_RTX);
 
          if (note)
            {
@@ -8634,6 +8635,8 @@ maybe_eliminate_biv (loop, bl, eliminate_p, threshold, insn_count)
                }
            }
        }
+
+      /* Closely examine the insn if the biv is mentioned.  */
       if ((code == INSN || code == JUMP_INSN || code == CALL_INSN)
          && reg_mentioned_p (reg, PATTERN (p))
          && ! maybe_eliminate_biv_1 (loop, PATTERN (p), p, bl,
@@ -8645,6 +8648,12 @@ maybe_eliminate_biv (loop, bl, eliminate_p, threshold, insn_count)
                     bl->regno, INSN_UID (p));
          break;
        }
+
+      /* If we are eliminating, kill REG_EQUAL notes mentioning the biv.  */
+      if (eliminate_p
+         && (note = find_reg_note (p, REG_EQUAL, NULL_RTX)) != NULL_RTX
+         && reg_mentioned_p (reg, XEXP (note, 0)))
+       remove_note (p, note);
     }
 
   if (p == loop->end)

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index cadf26a..0e978c2 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,9 @@
 2002-12-19  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
+       * gcc.c-torture/execute/20021219-1.c: New test.
+
+2002-12-19  Eric Botcazou  <ebotcazou@libertysurf.fr>
+
        * gcc.dg/i386-pic-1.c: New test.
 
 2002-12-18  Kriang Lerdsuwanakij  <lerdsuwa@users.sourceforge.net>

diff --git a/gcc/testsuite/gcc.c-torture/execute/20021219-1.c b/gcc/testsuite/gcc.c-torture/execute/20021219-1.c
new file mode 100644 (file)
index 0000000..2e658a5
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/20021219-1.c
@@ -0,0 +1,18 @@
+/* PR optimization/8988 */
+/* Contributed by Kevin Easton */
+
+void foo(char *p1, char **p2)
+{}
+ 
+int main(void)
+{
+  char str[] = "foo { xx }";
+  char *ptr = str + 5;
+
+  foo(ptr, &ptr);
+
+  while (*ptr && (*ptr == 13 || *ptr == 32))
+    ptr++;
+
+  return 0;
+}