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rs6000: re-enable web and rnreg with -funroll-loops

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Previously, limited unrolling was enabled at O2 for powerpc in r278034.  At that
time, -fweb and -frename-registers were not enabled together with -funroll-loops
even for -O3.  After that, we notice there are some performance degradations on
SPEC2006fp which caused by without web and rnreg.  This patch enable -fweb
and -frename-registers for -funroll-loops to align original behavior before
r278034.

gcc/
2019-12-23  Jiufu Guo  <guojiufu@linux.ibm.com>

	* config/rs6000/rs6000.c (rs6000_option_override_internal): Enable
	-fweb and -frename-registers with -funroll-loops

From-SVN: r279725
This commit is contained in:
Jiufu Guo 2019-12-24 13:27:33 +00:00 committed by Jiufu Guo
parent f2a8799309
commit b57fab1860
2 changed files with 16 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2019-12-24 Jiufu Guo <guojiufu@linux.ibm.com>
* config/rs6000/rs6000.c (rs6000_option_override_internal): Enable
-fweb and -frename-registers with -funroll-loops
2019-12-22 Gerald Pfeifer <gerald@pfeifer.com>
* doc/invoke.texi (-flto): Use "compile time" as a noun.

15
gcc/config/rs6000/rs6000.c
View File

@ -4538,12 +4538,19 @@ rs6000_option_override_internal (bool global_init_p)
param_sched_pressure_algorithm,
SCHED_PRESSURE_MODEL);
/* Explicit -funroll-loops turns -munroll-only-small-loops off. */
if (((global_options_set.x_flag_unroll_loops && flag_unroll_loops)
/* Explicit -funroll-loops turns -munroll-only-small-loops off, and
turns -fweb and -frename-registers on. */
if ((global_options_set.x_flag_unroll_loops && flag_unroll_loops)
|| (global_options_set.x_flag_unroll_all_loops
&& flag_unroll_all_loops))
&& !global_options_set.x_unroll_only_small_loops)
unroll_only_small_loops = 0;
{
if (!global_options_set.x_unroll_only_small_loops)
unroll_only_small_loops = 0;
if (!global_options_set.x_flag_rename_registers)
flag_rename_registers = 1;
if (!global_options_set.x_flag_web)
flag_web = 1;
}
/* If using typedef char *va_list, signal that
__builtin_va_start (&ap, 0) can be optimized to