[Patch, PR 54128] ira.c change to fix mips bootstrap

[Steve Ellcey]

Here is my patch to fix the bootstrap comparision failure (PR 54128) on
MIPS.  The reason for the comparision failure was a difference in
register usage and I tracked it down to build_insn_chain which checked
all instructions for register usage in order to set the dead_or_set
and live_relevant_regs bitmaps instead of checking only non-debug
instructions.  Changing INSN_P to NONDEBUG_INSN_P in build_insn_chain
allowed me to bootstrap and caused no regressions.

OK to checkin?

Steve Ellcey
sell...@mips.com


2012-08-31  Steve Ellcey  <sell...@mips.com>

        PR bootstrap/54128
        * ira.c (build_insn_chain): Check only NONDEBUG instructions for
        register usage.

diff --git a/gcc/ira.c b/gcc/ira.c
index 3825498..477c87b 100644
--- a/gcc/ira.c
+++ b/gcc/ira.c
@@ -3341,7 +3341,7 @@ build_insn_chain (void)
              c->insn = insn;
              c->block = bb->index;
 
-             if (INSN_P (insn))
+             if (NONDEBUG_INSN_P (insn))
                for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
                  {
                    df_ref def = *def_rec;
@@ -3432,7 +3432,7 @@ build_insn_chain (void)
              bitmap_and_compl_into (live_relevant_regs, elim_regset);
              bitmap_copy (&c->live_throughout, live_relevant_regs);
 
-             if (INSN_P (insn))
+             if (NONDEBUG_INSN_P (insn))
                for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
                  {
                    df_ref use = *use_rec;