OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

re PR inline-asm/28686 (ebp from clobber list used as operand) 

2007-02-06  Seongbae Park <seongbae.park@gmail.com>

	PR inline-asm/28686
	* global.c (compute_regsets): New function.
	(global_alloc): Refactored ELIMINABLE_REGSET
	and NO_GLOBAL_ALLOC_REGS computation out.
	(rest_of_handle_global_alloc): Call compute_regsets()
	for non-optimizing case.

From-SVN: r121663
This commit is contained in:
Seongbae Park 2007-02-06 19:43:41 +00:00 committed by Seongbae Park
parent 5096114103
commit ad8e8d0b46
2 changed files with 60 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2007-02-06 Seongbae Park <seongbae.park@gmail.com>
PR inline-asm/28686
* global.c (compute_regsets): New function.
(global_alloc): Refactored ELIMINABLE_REGSET
and NO_GLOBAL_ALLOC_REGS computation out.
(rest_of_handle_global_alloc): Call compute_regsets()
for non-optimizing case.
2007-02-06 Richard Henderson <rth@redhat.com>
* config/i386/constraints.md (Y2): Rename from Y.

78
gcc/global.c
View File

@ -326,35 +326,38 @@ static void make_accurate_live_analysis (void);
/* Perform allocation of pseudo-registers not allocated by local_alloc.
/* Look through the list of eliminable registers. Add registers
clobbered by asm statements to LIVE_REGS. Set ELIM_SET to the set of
registers which may be eliminated. Set NO_GLOBAL_SET to the set of
registers which may not be used across blocks.
Return value is nonzero if reload failed
and we must not do any more for this function. */
ASM_CLOBBERED is the set of registers clobbered by some asm statement.
static int
global_alloc (void)
This will normally be called with LIVE_REGS as the global variable
regs_ever_live, ELIM_SET as the file static variable
eliminable_regset, and NO_GLOBAL_SET as the file static variable
NO_GLOBAL_ALLOC_REGS. */
static void
compute_regsets (char asm_clobbered[FIRST_PSEUDO_REGISTER],
char live_regs[FIRST_PSEUDO_REGISTER],
HARD_REG_SET *elim_set,
HARD_REG_SET *no_global_set)
{
int retval;
#ifdef ELIMINABLE_REGS
static const struct {const int from, to; } eliminables[] = ELIMINABLE_REGS;
#endif
size_t i;
int need_fp
= (! flag_omit_frame_pointer
|| (current_function_calls_alloca && EXIT_IGNORE_STACK)
|| FRAME_POINTER_REQUIRED);
size_t i;
rtx x;
make_accurate_live_analysis ();
max_allocno = 0;
/* A machine may have certain hard registers that
are safe to use only within a basic block. */
CLEAR_HARD_REG_SET (no_global_alloc_regs);
CLEAR_HARD_REG_SET (eliminable_regset);
CLEAR_HARD_REG_SET (*no_global_set);
CLEAR_HARD_REG_SET (*elim_set);
/* Build the regset of all eliminable registers and show we can't use those
that we already know won't be eliminated. */
@ -365,45 +368,63 @@ global_alloc (void)
= (! CAN_ELIMINATE (eliminables[i].from, eliminables[i].to)
|| (eliminables[i].to == STACK_POINTER_REGNUM && need_fp));
if (!regs_asm_clobbered[eliminables[i].from])
if (!asm_clobbered[eliminables[i].from])
{
SET_HARD_REG_BIT (eliminable_regset, eliminables[i].from);
SET_HARD_REG_BIT (*elim_set, eliminables[i].from);
if (cannot_elim)
SET_HARD_REG_BIT (no_global_alloc_regs, eliminables[i].from);
SET_HARD_REG_BIT (*no_global_set, eliminables[i].from);
}
else if (cannot_elim)
error ("%s cannot be used in asm here",
reg_names[eliminables[i].from]);
else
regs_ever_live[eliminables[i].from] = 1;
live_regs[eliminables[i].from] = 1;
}
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
if (!regs_asm_clobbered[HARD_FRAME_POINTER_REGNUM])
if (!asm_clobbered[HARD_FRAME_POINTER_REGNUM])
{
SET_HARD_REG_BIT (eliminable_regset, HARD_FRAME_POINTER_REGNUM);
SET_HARD_REG_BIT (*elim_set, HARD_FRAME_POINTER_REGNUM);
if (need_fp)
SET_HARD_REG_BIT (no_global_alloc_regs, HARD_FRAME_POINTER_REGNUM);
SET_HARD_REG_BIT (*no_global_set, HARD_FRAME_POINTER_REGNUM);
}
else if (need_fp)
error ("%s cannot be used in asm here",
reg_names[HARD_FRAME_POINTER_REGNUM]);
else
regs_ever_live[HARD_FRAME_POINTER_REGNUM] = 1;
live_regs[HARD_FRAME_POINTER_REGNUM] = 1;
#endif
#else
if (!regs_asm_clobbered[FRAME_POINTER_REGNUM])
if (!asm_clobbered[FRAME_POINTER_REGNUM])
{
SET_HARD_REG_BIT (eliminable_regset, FRAME_POINTER_REGNUM);
SET_HARD_REG_BIT (*elim_set, FRAME_POINTER_REGNUM);
if (need_fp)
SET_HARD_REG_BIT (no_global_alloc_regs, FRAME_POINTER_REGNUM);
SET_HARD_REG_BIT (*no_global_set, FRAME_POINTER_REGNUM);
}
else if (need_fp)
error ("%s cannot be used in asm here", reg_names[FRAME_POINTER_REGNUM]);
else
regs_ever_live[FRAME_POINTER_REGNUM] = 1;
live_regs[FRAME_POINTER_REGNUM] = 1;
#endif
}
/* Perform allocation of pseudo-registers not allocated by local_alloc.
Return value is nonzero if reload failed
and we must not do any more for this function. */
static int
global_alloc (void)
{
int retval;
size_t i;
rtx x;
make_accurate_live_analysis ();
compute_regsets (regs_asm_clobbered, regs_ever_live,
&eliminable_regset, &no_global_alloc_regs);
/* Track which registers have already been used. Start with registers
explicitly in the rtl, then registers allocated by local register
@ -460,6 +481,7 @@ global_alloc (void)
reg_may_share[r2] = r1;
}
max_allocno = 0;
for (i = FIRST_PSEUDO_REGISTER; i < (size_t) max_regno; i++)
/* Note that reg_live_length[i] < 0 indicates a "constant" reg
that we are supposed to refrain from putting in a hard reg.
@ -2516,6 +2538,8 @@ rest_of_handle_global_alloc (void)
failure = global_alloc ();
else
{
compute_regsets (regs_asm_clobbered, regs_ever_live,
&eliminable_regset, &no_global_alloc_regs);
build_insn_chain (get_insns ());
failure = reload (get_insns (), 0);
}