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* ira.c (ira): Use simple LRA algorithm when not optimizing.

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From-SVN: r279550
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Eric Botcazou 2019-12-18 23:03:23 +00:00 • committed by Eric Botcazou
parent d3769410c6
commit 11b8091fb3
2 changed files with 24 additions and 12 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2019-12-18 Eric Botcazou <ebotcazou@adacore.com>
* ira.c (ira): Use simple LRA algorithm when not optimizing.
2019-12-18 Thomas Schwinge <thomas@codesourcery.com>
* gimplify.c (gimplify_omp_target_update): Elaborate 'exit data'

32
gcc/ira.c
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@ -5192,8 +5192,6 @@ ira (FILE *f)
int ira_max_point_before_emit;
bool saved_flag_caller_saves = flag_caller_saves;
enum ira_region saved_flag_ira_region = flag_ira_region;
unsigned int i;
int num_used_regs = 0;
clear_bb_flags ();
@ -5207,18 +5205,28 @@ ira (FILE *f)
/* Perform target specific PIC register initialization. */
targetm.init_pic_reg ();
ira_conflicts_p = optimize > 0;
if (optimize)
{
ira_conflicts_p = true;
/* Determine the number of pseudos actually requiring coloring. */
for (i = FIRST_PSEUDO_REGISTER; i < DF_REG_SIZE (df); i++)
num_used_regs += !!(DF_REG_USE_COUNT (i) + DF_REG_DEF_COUNT (i));
/* Determine the number of pseudos actually requiring coloring. */
unsigned int num_used_regs = 0;
for (unsigned int i = FIRST_PSEUDO_REGISTER; i < DF_REG_SIZE (df); i++)
if (DF_REG_DEF_COUNT (i) || DF_REG_USE_COUNT (i))
num_used_regs++;
/* If there are too many pseudos and/or basic blocks (e.g. 10K
pseudos and 10K blocks or 100K pseudos and 1K blocks), we will
use simplified and faster algorithms in LRA. */
lra_simple_p
= (ira_use_lra_p
&& num_used_regs >= (1 << 26) / last_basic_block_for_fn (cfun));
/* If there are too many pseudos and/or basic blocks (e.g. 10K
pseudos and 10K blocks or 100K pseudos and 1K blocks), we will
use simplified and faster algorithms in LRA. */
lra_simple_p
= ira_use_lra_p
&& num_used_regs >= (1U << 26) / last_basic_block_for_fn (cfun);
}
else
{
ira_conflicts_p = false;
lra_simple_p = ira_use_lra_p;
}
if (lra_simple_p)
{