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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/53915] New: gcov -f rounding problem
Date: Tue, 10 Jul 2012 13:32:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53915

             Bug #: 53915
           Summary: gcov -f rounding problem
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: gcov-profile
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: vincent-gcc@vinc17.net


I have the following problem with gcov 4.7.1 under Debian:

ypig:/tmp/ompfr-gcov/src> gcov -f round_prec.c
Function 'mpfr_can_round_raw'
Lines executed:100.00% of 44

Function 'mpfr_can_round'
Lines executed:100.00% of 4

Function 'mpfr_prec_round'
Lines executed:100.00% of 31

Function 'mpfr_round_raw_4'
Lines executed:95.00% of 60

Function 'mpfr_round_raw_2'
Lines executed:99.99% of 9

Function 'mpfr_round_raw'
Lines executed:100.00% of 7

File 'round_prec.c'
Lines executed:100.00% of 79
Creating 'round_prec.c.gcov'

File 'round_raw_generic.c'
Lines executed:97.37% of 76
Creating 'round_raw_generic.c.gcov'

File '/usr/include/gmp-x86_64.h'
No executable lines
Removing 'gmp-x86_64.h.gcov'

See the result for Function 'mpfr_round_raw_2': 99.99% of 9. This is not
possible! Either all the lines are executed, in which case one should get 100%,
or at most 8 lines of 9 are executed, in which case one should get 88.89% at
most.

This is reproducible on a Debian/unstable amd64 machine with MPFR trunk r8346
by running the tools/coverage script.

I've also reported with bug on the Debian BTS:

  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=681076