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i386.c (ia32_multipass_dfa_lookahead): Default to issue rate for post-reload scheduling.

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* i386.c (ia32_multipass_dfa_lookahead): Default to issue rate
	for post-reload scheduling.

From-SVN: r253453
This commit is contained in:
Jan Hubicka 2017-10-05 18:29:42 +02:00 • committed by Jan Hubicka
parent 592fbfb5fb
commit 10c98117e8
2 changed files with 12 additions and 38 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2017-10-05 Jan Hubicka <hubicka@ucw.cz>
* i386.c (ia32_multipass_dfa_lookahead): Default to issue rate
for post-reload scheduling.
2017-10-05 Tamar Christina <tamar.christina@arm.com>
* doc/sourcebuild.texi (vect_sizes_16B_8B, vect_sizes_32B_16B): New.

45
gcc/config/i386/i386.c
View file

@ -30761,44 +30761,13 @@ ix86_adjust_cost (rtx_insn *insn, int dep_type, rtx_insn *dep_insn, int cost,
static int
ia32_multipass_dfa_lookahead (void)
{
switch (ix86_tune)
{
case PROCESSOR_PENTIUM:
case PROCESSOR_LAKEMONT:
return 2;
case PROCESSOR_PENTIUMPRO:
case PROCESSOR_K6:
return 1;
case PROCESSOR_BDVER1:
case PROCESSOR_BDVER2:
case PROCESSOR_BDVER3:
case PROCESSOR_BDVER4:
/* We use lookahead value 4 for BD both before and after reload
schedules. Plan is to have value 8 included for O3. */
return 4;
case PROCESSOR_CORE2:
case PROCESSOR_NEHALEM:
case PROCESSOR_SANDYBRIDGE:
case PROCESSOR_HASWELL:
case PROCESSOR_BONNELL:
case PROCESSOR_SILVERMONT:
case PROCESSOR_KNL:
case PROCESSOR_KNM:
case PROCESSOR_INTEL:
/* Generally, we want haifa-sched:max_issue() to look ahead as far
as many instructions can be executed on a cycle, i.e.,
issue_rate. I wonder why tuning for many CPUs does not do this. */
if (reload_completed)
return ix86_issue_rate ();
/* Don't use lookahead for pre-reload schedule to save compile time. */
return 0;
default:
return 0;
}
/* Generally, we want haifa-sched:max_issue() to look ahead as far
as many instructions can be executed on a cycle, i.e.,
issue_rate. */
if (reload_completed)
return ix86_issue_rate ();
/* Don't use lookahead for pre-reload schedule to save compile time. */
return 0;
}
/* Return true if target platform supports macro-fusion. */