https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79259
Bug ID: 79259
Summary: [7 Regression] Corrupted profile when one uses -O1
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
Target Milestone: ---
Following test-case can't properly use PGO:
gcc auto-profile.ii -fprofile-generate -O1 && ./a.out && gcc auto-profile.ii
-fprofile-use -O1
auto-profile.ii:17:1: error: the control flow of function ‘_Z3fn2v’ does not
match its profile data (counter ‘arcs’) [-Werror=coverage-mismatch]
}
^
auto-profile.ii:17:1: error: the control flow of function ‘_Z3fn2v’ does not
match its profile data (counter ‘time_profiler’) [-Werror=coverage-mismatch]
cc1plus: some warnings being treated as errors
Started with r239769. Problem is that flag_ipa_bit_cp is enabled with
-fprofile-use. That triggers ccp1 to find nonzero bits as it's guarded with:
if (ccp_finalize (nonzero_p || flag_ipa_bit_cp))
{
todo = (TODO_cleanup_cfg | TODO_update_ssa);
/* ccp_finalize does not preserve loop-closed ssa. */
loops_state_clear (LOOP_CLOSED_SSA);
}
I've got patch for that.
