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rs6000.c (rs6000_reassociation_width): Add function for TARGET_SCHED_REASSOCIATION_WIDTH to enable parallel...

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* config/rs6000/rs6000.c (rs6000_reassociation_width): Add
        function for TARGET_SCHED_REASSOCIATION_WIDTH to enable
        parallel reassociation for power8 and forward.

From-SVN: r236043
This commit is contained in:
Aaron Sawdey 2016-05-09 16:56:30 +00:00 • committed by Aaron Sawdey
parent fc97f80502
commit 8964ed82db
2 changed files with 43 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-05-04 Aaron Sawdey <acsawdey@linux.vnet.ibm.com>
* config/rs6000/rs6000.c (rs6000_reassociation_width): Add
function for TARGET_SCHED_REASSOCIATION_WIDTH to enable
parallel reassociation for power8 and forward.
2016-05-09 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.md (absneg splitters with general regs): Use

37
gcc/config/rs6000/rs6000.c
View file

@ -1755,6 +1755,9 @@ static const struct attribute_spec rs6000_attribute_table[] =
#undef TARGET_CONDITIONAL_REGISTER_USAGE
#define TARGET_CONDITIONAL_REGISTER_USAGE rs6000_conditional_register_usage
#undef TARGET_SCHED_REASSOCIATION_WIDTH
#define TARGET_SCHED_REASSOCIATION_WIDTH rs6000_reassociation_width
#undef TARGET_TRAMPOLINE_INIT
#define TARGET_TRAMPOLINE_INIT rs6000_trampoline_init
@ -8633,6 +8636,40 @@ rs6000_offsettable_memref_p (rtx op, machine_mode reg_mode)
true, worst_case);
}
/* Determine the reassociation width to be used in reassociate_bb.
This takes into account how many parallel operations we
can actually do of a given type, and also the latency.
P8:
int add/sub 6/cycle
mul 2/cycle
vect add/sub/mul 2/cycle
fp add/sub/mul 2/cycle
dfp 1/cycle
*/
static int
rs6000_reassociation_width (unsigned int opc ATTRIBUTE_UNUSED,
enum machine_mode mode)
{
switch (rs6000_cpu)
{
case PROCESSOR_POWER8:
case PROCESSOR_POWER9:
if (DECIMAL_FLOAT_MODE_P (mode))
return 1;
if (VECTOR_MODE_P (mode))
return 4;
if (INTEGRAL_MODE_P (mode))
return opc == MULT_EXPR ? 4 : 6;
if (FLOAT_MODE_P (mode))
return 4;
break;
default:
break;
}
return 1;
}
/* Change register usage conditional on target flags. */
static void
rs6000_conditional_register_usage (void)