On Friday 24 November 2017 05:36 PM, Siddhesh Poyarekar wrote: > freq_max < 1, i.e. highest frequency among bbs in the function being > higher than real_bb_freq_max means that the bb ends up with a profile > count larger than real_bb_freq_max and then can go all the way up to > and beyond profile_count::max_count. > > Bootstrapped on aarch64, testsuite in progress.
Tests came out clean (no new regressions) on aarch64 and x86_64. Ping? Siddhesh > > * gcc/predict.c (estimate_bb_frequencies): Don't reset freq_max. > * gcc/testsuite/gcc.dg/pr83069.c: New test case. > > --- > gcc/predict.c | 2 -- > gcc/testsuite/gcc.dg/pr83069.c | 15 +++++++++++++++ > 2 files changed, 15 insertions(+), 2 deletions(-) > create mode 100644 gcc/testsuite/gcc.dg/pr83069.c > > diff --git a/gcc/predict.c b/gcc/predict.c > index 0f34956..ff9b5a9 100644 > --- a/gcc/predict.c > +++ b/gcc/predict.c > @@ -3613,8 +3613,6 @@ estimate_bb_frequencies (bool force) > freq_max = BLOCK_INFO (bb)->frequency; > > freq_max = real_bb_freq_max / freq_max; > - if (freq_max < 16) > - freq_max = 16; > profile_count ipa_count = ENTRY_BLOCK_PTR_FOR_FN (cfun)->count.ipa (); > cfun->cfg->count_max = profile_count::uninitialized (); > FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, next_bb) > diff --git a/gcc/testsuite/gcc.dg/pr83069.c b/gcc/testsuite/gcc.dg/pr83069.c > new file mode 100644 > index 0000000..d43d78d > --- /dev/null > +++ b/gcc/testsuite/gcc.dg/pr83069.c > @@ -0,0 +1,15 @@ > +/* { dg-do compile } */ > +/* { dg-options "-O1" } */ > + > +void > +foo (unsigned long *res, unsigned long in) > +{ > + for (unsigned long a = 0; a < 98; a++) > + for (unsigned long b = 0; b < 98; b++) > + for (unsigned long c = 0; c < 98; c++) > + for (unsigned long d = 0; d < 98; d++) > + for (unsigned long e = 0; e < 98; e++) > + for (unsigned long f = 0; f < 98; f++) > + for (unsigned long g = 0; g < 98; g++) > + *res += a * in; > +} >