re PR debug/44223 (segmentation fault with -g -fsched-pressure)

	PR debug/44223
	* haifa-sched.c (schedule_insn): When freeing INSN_REG_USE_LIST,
	unchain each use from the cyclic next_regno_use chain first.

	* gcc.target/i386/pr44223.c: New test.

From-SVN: r159680

gcc/ChangeLog

+2010-05-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/44223
+	* haifa-sched.c (schedule_insn): When freeing INSN_REG_USE_LIST,
+	unchain each use from the cyclic next_regno_use chain first.
+
 2010-05-21  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* real: Do not include gmp.h, mpfr.h, and mpc.h.

gcc/haifa-sched.c

@@ -1721,6 +1721,12 @@ schedule_insn (rtx insn)
 	/* Unknown location doesn't use any registers.  */
 	for (use = INSN_REG_USE_LIST (dbg); use != NULL; use = next)
 	  {
+	    struct reg_use_data *prev = use;
+
+	    /* Remove use from the cyclic next_regno_use chain first.  */
+	    while (prev->next_regno_use != use)
+	      prev = prev->next_regno_use;
+	    prev->next_regno_use = use->next_regno_use;
 	    next = use->next_insn_use;
 	    free (use);
 	  }

gcc/testsuite/ChangeLog

+2010-05-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/44223
+	* gcc.target/i386/pr44223.c: New test.
+
 2010-05-21  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* gcc.target/i386/pr25993.c: Use @function as type specifier.

gcc/testsuite/gcc.target/i386/pr44223.c

+/* PR debug/44223 */
+/* { dg-do compile } */
+/* { dg-options "-O3 -fsched-pressure -fschedule-insns -fpic -march=core2 -g" { target fpic } } */
+
+struct S { unsigned int s1; int s2; };
+struct T { int t; };
+
+extern void extfn (struct S *);
+
+static inline void
+foo (struct S *s, unsigned char *x, int y)
+{
+  s->s2 = 32;
+}
+
+static inline void
+bar (struct S *s, int n, unsigned int x)
+{
+  unsigned int s1;
+  int s2;
+  s1 = s->s1;
+  s2 = s->s2;
+  if (n < s2)
+    s1 = (s1 << n) | x;
+  s->s1 = s1;
+}
+
+int
+baz (struct T *u, unsigned char *v, int w)
+{
+  struct S y;
+  foo (&y, v, 7);
+  bar (&y, 12, 0xfff);
+  bar (&y, 2, u->t);
+  extfn (&y);
+}