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mips.c (mips_has_long_branch_p): New function, split out from...

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gcc/
	* config/mips/mips.c (mips_has_long_branch_p): New function,
	split out from...
	(mips_expand_ghost_gp_insns): ...here.  Look inside sequences.

From-SVN: r190701
This commit is contained in:
Richard Sandiford 2012-08-26 19:22:59 +00:00 • committed by Richard Sandiford
parent 62332eba32
commit a1c741f02e
2 changed files with 35 additions and 17 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2012-08-26 Richard Sandiford <rdsandiford@googlemail.com>
* config/mips/mips.c (mips_has_long_branch_p): New function,
split out from...
(mips_expand_ghost_gp_insns): ...here. Look inside sequences.
2012-08-26 Richard Sandiford <rdsandiford@googlemail.com>
* config/mips/mips.c (r10k_safe_mem_expr_p): Use get_inner_reference.

46
gcc/config/mips/mips.c
View file

@ -15478,23 +15478,15 @@ mips_reorg_process_insns (void)
htab_delete (htab);
}
/* If we are using a GOT, but have not decided to use a global pointer yet,
see whether we need one to implement long branches. Convert the ghost
global-pointer instructions into real ones if so. */
/* Return true if the function has a long branch instruction. */
static bool
mips_expand_ghost_gp_insns (void)
mips_has_long_branch_p (void)
{
rtx insn;
rtx insn, subinsn;
int normal_length;
/* Quick exit if we already know that we will or won't need a
global pointer. */
if (!TARGET_USE_GOT
|| cfun->machine->global_pointer == INVALID_REGNUM
|| mips_must_initialize_gp_p ())
return false;
/* We need up-to-date instruction lengths. */
shorten_branches (get_insns ());
/* Look for a branch that is longer than normal. The normal length for
@ -15503,12 +15495,32 @@ mips_expand_ghost_gp_insns (void)
but they have no delay slot. */
normal_length = (TARGET_MIPS16 ? 4 : 8);
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
if (JUMP_P (insn)
&& USEFUL_INSN_P (insn)
&& get_attr_length (insn) > normal_length)
break;
FOR_EACH_SUBINSN (subinsn, insn)
if (JUMP_P (subinsn)
&& USEFUL_INSN_P (subinsn)
&& get_attr_length (subinsn) > normal_length
&& (any_condjump_p (subinsn) || any_uncondjump_p (subinsn)))
return true;
if (insn == NULL_RTX)
return false;
}
/* If we are using a GOT, but have not decided to use a global pointer yet,
see whether we need one to implement long branches. Convert the ghost
global-pointer instructions into real ones if so. */
static bool
mips_expand_ghost_gp_insns (void)
{
/* Quick exit if we already know that we will or won't need a
global pointer. */
if (!TARGET_USE_GOT
|| cfun->machine->global_pointer == INVALID_REGNUM
|| mips_must_initialize_gp_p ())
return false;
/* Run a full check for long branches. */
if (!mips_has_long_branch_p ())
return false;
/* We've now established that we need $gp. */