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re PR target/47440 (Use LCM for vzeroupper insertion)

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PR target/47440
	* config/i386/i386.c (gate_insert_vzeroupper): New function.
	(rest_of_handle_insert_vzeroupper): Ditto.
	(struct rtl_opt_pass pass_insert_vzeroupper): New.
	(ix86_option_override): Register vzeroupper insertion pass here.
	(ix86_check_avx256_register): Handle SUBREGs properly.
	(ix86_init_machine_status): Remove optimize_mode_switching[AVX_U128]
	initialization.

From-SVN: r193503
This commit is contained in:
Uros Bizjak 2012-11-14 17:47:29 +01:00
parent 9e81cc8bde
commit ccd025e14c
2 changed files with 77 additions and 6 deletions
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16
gcc/ChangeLog
View File

@ -1,3 +1,15 @@
2012-11-14 Uros Bizjak <ubizjak@gmail.com>
Vladimir Yakovlev <vladimir.b.yakovlev@intel.com>
PR target/47440
* config/i386/i386.c (gate_insert_vzeroupper): New function.
(rest_of_handle_insert_vzeroupper): Ditto.
(struct rtl_opt_pass pass_insert_vzeroupper): New.
(ix86_option_override): Register vzeroupper insertion pass here.
(ix86_check_avx256_register): Handle SUBREGs properly.
(ix86_init_machine_status): Remove optimize_mode_switching[AVX_U128]
initialization.
2012-11-14 David Edelsohn <dje.gcc@gmail.com>
* configure.ac (HAVE_LD_LARGE_TOC): Add AIX test.
@ -34,8 +46,8 @@
* cgraph.c (insert_new_cgraph_node_version): Use cgraph_get_node
instead of cgraph_get_create_node.
* config/i386/i386.c (ix86_get_function_versions_dispatcher): Move ifunc
not supported code to the end.
* config/i386/i386.c (ix86_get_function_versions_dispatcher): Move
ifunc not supported code to the end.
2012-11-13 Martin Jambor <mjambor@suse.cz>

67
gcc/config/i386/i386.c
View File

@ -2301,6 +2301,52 @@ static const char *const cpu_names[TARGET_CPU_DEFAULT_max] =
"btver2"
};
static bool
gate_insert_vzeroupper (void)
{
return TARGET_VZEROUPPER;
}
static unsigned int
rest_of_handle_insert_vzeroupper (void)
{
int i;
/* vzeroupper instructions are inserted immediately after reload to
account for possible spills from 256bit registers. The pass
reuses mode switching infrastructure by re-running mode insertion
pass, so disable entities that have already been processed. */
for (i = 0; i < MAX_386_ENTITIES; i++)
ix86_optimize_mode_switching[i] = 0;
ix86_optimize_mode_switching[AVX_U128] = 1;
/* Call optimize_mode_switching. */
pass_mode_switching.pass.execute ();
return 0;
}
struct rtl_opt_pass pass_insert_vzeroupper =
{
{
RTL_PASS,
"vzeroupper", /* name */
OPTGROUP_NONE, /* optinfo_flags */
gate_insert_vzeroupper, /* gate */
rest_of_handle_insert_vzeroupper, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_NONE, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_df_finish | TODO_verify_rtl_sharing |
0, /* todo_flags_finish */
}
};
/* Return true if a red-zone is in use. */
static inline bool
@ -3705,7 +3751,16 @@ ix86_option_override_internal (bool main_args_p)
static void
ix86_option_override (void)
{
static struct register_pass_info insert_vzeroupper_info
= { &pass_insert_vzeroupper.pass, "reload",
1, PASS_POS_INSERT_AFTER
};
ix86_option_override_internal (true);
/* This needs to be done at start up. It's convenient to do it here. */
register_pass (&insert_vzeroupper_info);
}
/* Update register usage after having seen the compiler flags. */
@ -14988,10 +15043,15 @@ output_387_binary_op (rtx insn, rtx *operands)
/* Check if a 256bit AVX register is referenced inside of EXP. */
static int
ix86_check_avx256_register (rtx *exp, void *data ATTRIBUTE_UNUSED)
ix86_check_avx256_register (rtx *pexp, void *data ATTRIBUTE_UNUSED)
{
if (REG_P (*exp)
&& VALID_AVX256_REG_OR_OI_MODE (GET_MODE (*exp)))
rtx exp = *pexp;
if (GET_CODE (exp) == SUBREG)
exp = SUBREG_REG (exp);
if (REG_P (exp)
&& VALID_AVX256_REG_OR_OI_MODE (GET_MODE (exp)))
return 1;
return 0;
@ -23449,7 +23509,6 @@ ix86_init_machine_status (void)
f = ggc_alloc_cleared_machine_function ();
f->use_fast_prologue_epilogue_nregs = -1;
f->call_abi = ix86_abi;
f->optimize_mode_switching[AVX_U128] = TARGET_VZEROUPPER;
return f;
}