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predict.c (estimate_bb_frequencies): Do frequency calculation with a volatile temporary. 

* predict.c (estimate_bb_frequencies): Do frequency calculation
        with a volatile temporary.

From-SVN: r51878
This commit is contained in:
Richard Henderson 2002-04-04 13:37:47 -08:00 committed by Richard Henderson
parent 162a50c82e
commit 2955af8676
2 changed files with 12 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2002-04-04 Richard Henderson <rth@redhat.com>
* predict.c (estimate_bb_frequencies): Do frequency calculation
with a volatile temporary.
2002-04-04 Ulrich Weigand <uweigand@de.ibm.com>
* config/s390/linux.h (LOCAL_LABEL_PREFIX): Define.

9
gcc/predict.c
View File

@ -955,6 +955,7 @@ estimate_bb_frequencies (loops)
for (i = -2; i < n_basic_blocks; i++)
{
basic_block bb;
volatile double tmp;
if (i == -2)
bb = ENTRY_BLOCK_PTR;
@ -962,8 +963,12 @@ estimate_bb_frequencies (loops)
bb = EXIT_BLOCK_PTR;
else
bb = BASIC_BLOCK (i);
bb->frequency
= BLOCK_INFO (bb)->frequency * BB_FREQ_MAX / freq_max + 0.5;
/* ??? Prevent rounding differences due to optimization on x86. */
tmp = BLOCK_INFO (bb)->frequency * BB_FREQ_MAX;
tmp /= freq_max;
tmp += 0.5;
bb->frequency = tmp;
}
free_aux_for_blocks ();