diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/predict.c | 9 |
2 files changed, 12 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 7c9f421..23e407a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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. diff --git a/gcc/predict.c b/gcc/predict.c index 56b0436..1d8691c 100644 --- a/gcc/predict.c +++ b/gcc/predict.c @@ -942,6 +942,7 @@ 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; @@ -949,8 +950,12 @@ 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 (); |