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* config/tc-mips.c (emit_nop): Delete.
	(get_delay_slot_nop): New function.
	(nops_for_insn_or_target): Use it.
	(append_insn): Likewise.  When avoiding hazards, call add_fixed_insn
	and insert_into_history directly.
This commit is contained in:
Richard Sandiford 2011-08-06 10:25:01 +00:00
parent 11625dd84f
commit 14fe068bd8
2 changed files with 34 additions and 28 deletions
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8
gas/ChangeLog
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@ -1,3 +1,11 @@
2011-08-06 Richard Sandiford <rdsandiford@googlemail.com>
* config/tc-mips.c (emit_nop): Delete.
(get_delay_slot_nop): New function.
(nops_for_insn_or_target): Use it.
(append_insn): Likewise. When avoiding hazards, call add_fixed_insn
and insert_into_history directly.
2011-08-06 Richard Sandiford <rdsandiford@googlemail.com> 2011-08-06 Richard Sandiford <rdsandiford@googlemail.com>
* config/tc-mips.c (delayed_branch_p, compact_branch_p) * config/tc-mips.c (delayed_branch_p, compact_branch_p)

54
gas/config/tc-mips.c
View File

@ -1785,15 +1785,6 @@ insert_into_history (unsigned int first, unsigned int n,
} }
} }
/* Emit a nop instruction, recording it in the history buffer. */
static void
emit_nop (void)
{
add_fixed_insn (NOP_INSN);
insert_into_history (0, 1, NOP_INSN);
}
/* Initialize vr4120_conflicts. There is a bit of duplication here: /* Initialize vr4120_conflicts. There is a bit of duplication here:
the idea is to make it obvious at a glance that each errata is the idea is to make it obvious at a glance that each errata is
included. */ included. */
@ -2930,6 +2921,18 @@ branch_likely_p (const struct mips_cl_insn *ip)
return (ip->insn_mo->pinfo & INSN_COND_BRANCH_LIKELY) != 0; return (ip->insn_mo->pinfo & INSN_COND_BRANCH_LIKELY) != 0;
} }
/* Return the type of nop that should be used to fill the delay slot
of delayed branch IP. */
static struct mips_cl_insn *
get_delay_slot_nop (const struct mips_cl_insn *ip)
{
if (mips_opts.micromips
&& (ip->insn_mo->pinfo2 & INSN2_BRANCH_DELAY_32BIT))
return &micromips_nop32_insn;
return NOP_INSN;
}
/* Return the mask of core registers that IP reads or writes. */ /* Return the mask of core registers that IP reads or writes. */
static unsigned int static unsigned int
@ -3596,7 +3599,7 @@ nops_for_insn_or_target (int ignore, const struct mips_cl_insn *hist,
if (delayed_branch_p (insn)) if (delayed_branch_p (insn))
{ {
tmp_nops = nops_for_sequence (2, ignore ? ignore + 2 : 0, tmp_nops = nops_for_sequence (2, ignore ? ignore + 2 : 0,
hist, insn, NOP_INSN); hist, insn, get_delay_slot_nop (insn));
if (tmp_nops > nops) if (tmp_nops > nops)
nops = tmp_nops; nops = tmp_nops;
} }
@ -3969,7 +3972,7 @@ static void
append_insn (struct mips_cl_insn *ip, expressionS *address_expr, append_insn (struct mips_cl_insn *ip, expressionS *address_expr,
bfd_reloc_code_real_type *reloc_type, bfd_boolean expansionp) bfd_reloc_code_real_type *reloc_type, bfd_boolean expansionp)
{ {
unsigned long prev_pinfo2, pinfo, pinfo2; unsigned long prev_pinfo2, pinfo;
bfd_boolean relaxed_branch = FALSE; bfd_boolean relaxed_branch = FALSE;
enum append_method method; enum append_method method;
bfd_boolean relax32; bfd_boolean relax32;
@ -3984,7 +3987,6 @@ append_insn (struct mips_cl_insn *ip, expressionS *address_expr,
prev_pinfo2 = history[0].insn_mo->pinfo2; prev_pinfo2 = history[0].insn_mo->pinfo2;
pinfo = ip->insn_mo->pinfo; pinfo = ip->insn_mo->pinfo;
pinfo2 = ip->insn_mo->pinfo2;
if (mips_opts.micromips if (mips_opts.micromips
&& !expansionp && !expansionp
@ -4107,7 +4109,8 @@ append_insn (struct mips_cl_insn *ip, expressionS *address_expr,
old_frag_offset = frag_now_fix (); old_frag_offset = frag_now_fix ();
for (i = 0; i < nops; i++) for (i = 0; i < nops; i++)
emit_nop (); add_fixed_insn (NOP_INSN);
insert_into_history (0, nops, NOP_INSN);
if (listing) if (listing)
{ {
@ -4422,21 +4425,16 @@ append_insn (struct mips_cl_insn *ip, expressionS *address_expr,
break; break;
case APPEND_ADD_WITH_NOP: case APPEND_ADD_WITH_NOP:
insert_into_history (0, 1, ip); {
if (mips_opts.micromips struct mips_cl_insn *nop;
&& (pinfo2 & INSN2_BRANCH_DELAY_32BIT))
{ insert_into_history (0, 1, ip);
add_fixed_insn (&micromips_nop32_insn); nop = get_delay_slot_nop (ip);
insert_into_history (0, 1, &micromips_nop32_insn); add_fixed_insn (nop);
if (mips_relax.sequence) insert_into_history (0, 1, nop);
mips_relax.sizes[mips_relax.sequence - 1] += 4; if (mips_relax.sequence)
} mips_relax.sizes[mips_relax.sequence - 1] += insn_length (nop);
else }
{
emit_nop ();
if (mips_relax.sequence)
mips_relax.sizes[mips_relax.sequence - 1] += NOP_INSN_SIZE;
}
break; break;
case APPEND_ADD_COMPACT: case APPEND_ADD_COMPACT: