diff options
| author | Richard Sandiford <richard.sandiford@linaro.org> | 2017-09-13 17:04:08 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2017-09-13 17:04:08 +0000 |
| commit | 94e23f53d700769c453d31881c089d06cde823dd (patch) | |
| tree | c40d61202954230108cceb97d333c2c34f9c4ddb /gcc/targhooks.h | |
| parent | bb5d97112a8272c608b18167de9255949129890c (diff) | |
| download | gcc-94e23f53d700769c453d31881c089d06cde823dd.zip gcc-94e23f53d700769c453d31881c089d06cde823dd.tar.gz gcc-94e23f53d700769c453d31881c089d06cde823dd.tar.bz2 | |
Turn SECONDARY_MEMORY_NEEDED_MODE into a target hook
This includes a change to LRA. Previously the code was:
if (sclass == NO_REGS && dclass == NO_REGS)
return false;
#ifdef SECONDARY_MEMORY_NEEDED
if (SECONDARY_MEMORY_NEEDED (sclass, dclass, GET_MODE (src))
#ifdef SECONDARY_MEMORY_NEEDED_MODE
&& ((sclass != NO_REGS && dclass != NO_REGS)
|| GET_MODE (src) != SECONDARY_MEMORY_NEEDED_MODE (GET_MODE (src)))
#endif
)
{
*sec_mem_p = true;
return false;
}
#endif
in which the positioning of the second ifdef meant that defining
SECONDARY_MEMORY_NEEDED_MODE to its default value was not a no-op:
without a definition, we would consider using secondary reloads for
mem<-reg and reg<-mem reloads even if the secondary memory has the
same mode as the original mem, while defining it would avoid this.
The latter behaviour seems correct.
The default is different for reload and LRA. For LRA the default is
to use the original mode, while reload promotes smaller-than-word
integral modes to word mode:
if (GET_MODE_BITSIZE (mode) < BITS_PER_WORD && INTEGRAL_MODE_P (mode))
mode = mode_for_size (BITS_PER_WORD,
GET_MODE_CLASS (mode), 0).require ();
Some of the ports that have switched to LRA seemed to have
SECONDARY_MEMORY_NEEDED_MDOEs based on the old reload definition,
and still referred to the reload.c:get_secondary_mem function in
the comments. The patch just keeps them as-is.
2017-09-13 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
gcc/
* target.def (secondary_memory_needed_mode): New hook:
* targhooks.c (default_secondary_memory_needed_mode): Declare.
* targhooks.h (default_secondary_memory_needed_mode): New function.
* doc/tm.texi.in (SECONDARY_MEMORY_NEEDED_MODE): Replace with...
(TARGET_SECONDARY_MEMORY_NEEDED_MODE): ...this.
* doc/tm.texi: Regenerate.
* lra-constraints.c (check_and_process_move): Use
targetm.secondary_memory_needed_mode instead of
TARGET_SECONDARY_MEMORY_NEEDED_MODE.
(curr_insn_transform): Likewise.
* reload.c (get_secondary_mem): Likewise.
* config/alpha/alpha.h (SECONDARY_MEMORY_NEEDED_MODE): Delete.
* config/alpha/alpha.c (alpha_secondary_memory_needed_mode): New
function.
(TARGET_SECONDARY_MEMORY_NEEDED_MODE): Redefine.
* config/i386/i386.h (SECONDARY_MEMORY_NEEDED_MODE): Delete.
* config/i386/i386.c (ix86_secondary_memory_needed_mode): New function.
(TARGET_SECONDARY_MEMORY_NEEDED_MODE): Redefine.
* config/powerpcspe/powerpcspe.h (SECONDARY_MEMORY_NEEDED_MODE):
Delete.
* config/powerpcspe/powerpcspe-protos.h
(rs6000_secondary_memory_needed_mode): Delete.
* config/powerpcspe/powerpcspe.c
(TARGET_SECONDARY_MEMORY_NEEDED_MODE): Redefine.
(rs6000_secondary_memory_needed_mode): Make static.
* config/rs6000/rs6000.h (SECONDARY_MEMORY_NEEDED_MODE): Delete.
* config/rs6000/rs6000-protos.h (rs6000_secondary_memory_needed_mode):
Delete.
* config/rs6000/rs6000.c (TARGET_SECONDARY_MEMORY_NEEDED_MODE):
Redefine.
(rs6000_secondary_memory_needed_mode): Make static.
* config/s390/s390.h (SECONDARY_MEMORY_NEEDED_MODE): Delete.
* config/s390/s390.c (s390_secondary_memory_needed_mode): New function.
(TARGET_SECONDARY_MEMORY_NEEDED_MODE): Redefine.
* config/sparc/sparc.h (SECONDARY_MEMORY_NEEDED_MODE): Delete.
* config/sparc/sparc.c (TARGET_SECONDARY_MEMORY_NEEDED_MODE):
Redefine.
(sparc_secondary_memory_needed_mode): New function.
* system.h (TARGET_SECONDARY_MEMORY_NEEDED_MODE): Poison.
Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r252455
Diffstat (limited to 'gcc/targhooks.h')
| -rw-r--r-- | gcc/targhooks.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/targhooks.h b/gcc/targhooks.h index a0bd4aa..3d03215 100644 --- a/gcc/targhooks.h +++ b/gcc/targhooks.h @@ -159,6 +159,7 @@ extern bool default_different_addr_displacement_p (void); extern reg_class_t default_secondary_reload (bool, rtx, reg_class_t, machine_mode, secondary_reload_info *); +extern machine_mode default_secondary_memory_needed_mode (machine_mode); extern void default_target_option_override (void); extern void hook_void_bitmap (bitmap); extern int default_reloc_rw_mask (void); |