backport: Makefile.in (STAGESTUFF): Add *.peephole2.

        Merge peephole2 from new_ia32_branch:
        * Makefile.in (STAGESTUFF): Add *.peephole2.
        (mostlyclean): Likewise.
        (recog.o): Depend on resource.h.

        * final.c (peephole): Conditionalize decl on HAVE_peephole.
        (final_scan_insn): Likewise for the invocation of peephole.
        * genconfig.c (main): Look for peephole and peephole2 patterns.
        Emit HAVE_peephole* accordingly.
        * genpeep.c (main): Conditionalize entire output on HAVE_peephole.
        * flags.h (flag_peephole2): Declare.
        * toplev.c: New pass peephole2.  New flag -fpeephole2.

        * genattrtab.c (main): Count DEFINE_PEEPHOLE2.
        * gencodes.c (main): Likewise.
        * genextract.c (main): Likewise.
        * genoutput.c (main): Likewise.
        * genemit.c (max_operand_1): Look for the max scratch operand.
        (gen_rtx_scratch): New.
        (gen_exp): Use it, and pass on new arg subroutine_type.
        (gen_expand): Take max scratch into account.
        (gen_split): Emit peephole2 functions.
        (output_peephole2_scratch): New.
        (main): Include hard-reg-set.h and resource.h.  Handle peephole2.
        * genrecog.c (routine_type): Add PEEPHOLE2.
        (IS_SPLIT): New.
        (make_insn_sequence): Match outer parallel for peep2.  Discard
        top level scratches and dups.
        (add_to_sequence): New args insn_type and top.  Update all callers.
        Handle toplevel peep2 matching insns.
        (write_subroutine): Handle peep2.
        (write_tree_1): Likewise.
        (write_tree): Likewise.
        (main): Likewise.
        (change_state): New arg afterward.  Update all callers.
        Handle matching separate insns.
        * recog.c (recog_next_insn): New.
        (peephole2_optimize): New.
        * rtl.def (DEFINE_PEEPHOLE2): New.
        * resource.c (find_free_register): New argument last_insn.  Use it
        to find a register available through the entire span.
        * resource.h (find_free_register): Update prototype.

From-SVN: r29015

1 files changed, 16 insertions, 5 deletions

diff --git a/gcc/resource.c b/gcc/resource.c
index daa839c..8802645 100644
--- a/gcc/resource.c
+++ b/gcc/resource.c
@@ -1239,17 +1239,20 @@ mark_end_of_function_resources (trial, include_delayed_effects)
 			     include_delayed_effects);
 }
 
-/* Try to find an available hard register of mode MODE at
-   CURRENT_INSN, matching the register class in CLASS_STR. Registers
-   that already have bits set in REG_SET will not be considered.
+/* Try to find a hard register of mode MODE, matching the register class in
+   CLASS_STR, which is available at the beginning of insn CURRENT_INSN and
+   remains available until the end of LAST_INSN.  LAST_INSN may be NULL_RTX,
+   in which case the only condition is that the register must be available
+   before CURRENT_INSN.
+   Registers that already have bits set in REG_SET will not be considered.
 
    If an appropriate register is available, it will be returned and the
    corresponding bit(s) in REG_SET will be set; otherwise, NULL_RTX is
    returned.  */
 
 rtx
-find_free_register (current_insn, class_str, mode, reg_set)
-     rtx current_insn;
+find_free_register (current_insn, last_insn, class_str, mode, reg_set)
+     rtx current_insn, last_insn;
      char *class_str;
      int mode;
      HARD_REG_SET *reg_set;
@@ -1261,6 +1264,14 @@ find_free_register (current_insn, class_str, mode, reg_set)
     = (clet == 'r' ? GENERAL_REGS :  REG_CLASS_FROM_LETTER (clet));
 
   mark_target_live_regs (get_insns (), current_insn, &used);
+  if (last_insn)
+    while (current_insn != last_insn)
+      {
+	/* Exclude anything set in this insn.  */
+	mark_set_resources (PATTERN (current_insn), &used, 0, 1);
+	current_insn = next_nonnote_insn (current_insn);
+      }
+
 
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
     {