flow.c (insn_dead_p): Keep sets to PIC_OFFSET_TABLE_REGNUM alive before reload.

        * flow.c (insn_dead_p): Keep sets to PIC_OFFSET_TABLE_REGNUM
        alive before reload.

        * haifa-sched.c (struct deps): Add in_post_call_group_p.
        (add_dependence): Handle notes between SCHED_GROUP_P insns.
        (remove_dependence): Always define.
        (set_sched_group_p): New.
        (sched_analyze_2): Use it.
        (sched_analyze_insn): Don't special-case naked uses.  Look for
        and extend in_post_call_group_p.
        (sched_analyze): Clear stale SCHED_GROUP_P.  Set in_post_call_group_p.
        (init_deps): Clear in_post_call_group_p.

From-SVN: r34529

1 files changed, 10 insertions, 0 deletions

diff --git a/gcc/flow.c b/gcc/flow.c
index 2e2a79d..99cfbfc 100644
--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -3955,6 +3955,16 @@ insn_dead_p (pbi, x, call_ok, notes)
 		return 0;
 #endif
 
+#ifdef PIC_OFFSET_TABLE_REGNUM
+	      /* Before reload, do not allow sets of the pic register
+		 to be deleted.  Reload can insert references to
+		 constant pool memory anywhere in the function, making
+		 the PIC register live where it wasn't before.  */
+	      if (regno == PIC_OFFSET_TABLE_REGNUM && fixed_regs[regno]
+		  && ! reload_completed)
+		return 0;
+#endif
+
 	      /* Otherwise, the set is dead.  */
 	      return 1;
 	    }