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| 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/config/i386/i386.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/config/i386/i386.h')
| -rw-r--r-- | gcc/config/i386/i386.h | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h index a89782a..09b8da5 100644 --- a/gcc/config/i386/i386.h +++ b/gcc/config/i386/i386.h @@ -1524,14 +1524,6 @@ enum reg_class #define SECONDARY_MEMORY_NEEDED(CLASS1, CLASS2, MODE) \ ix86_secondary_memory_needed ((CLASS1), (CLASS2), (MODE), 1) -/* Get_secondary_mem widens integral modes to BITS_PER_WORD. - There is no need to emit full 64 bit move on 64 bit targets - for integral modes that can be moved using 32 bit move. */ -#define SECONDARY_MEMORY_NEEDED_MODE(MODE) \ - (GET_MODE_BITSIZE (MODE) < 32 && INTEGRAL_MODE_P (MODE) \ - ? mode_for_size (32, GET_MODE_CLASS (MODE), 0).require () \ - : MODE) - /* Return a class of registers that cannot change FROM mode to TO mode. */ #define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \ |