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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/97295] ICE on firefox built with lto+pgo:
 dist/include/mozilla/Casting.h:64:1: internal compiler error: in
 to_frequency, at profile-count.c:273
Date: Wed, 07 Oct 2020 10:23:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97295

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |ASSIGNED

--- Comment #5 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
So it's pretty clear what happens, it's about mixing of different flags:

TestFloatingPoint.o:

'-fno-openmp' '-fno-openacc' '-mtune=3Dgeneric' '-march=3Dx86-64' '-O3' '-O=
0'
'-Wno-error=3Dmaybe-uninitialized' '-Wno-error=3Ddeprecated-declarations'
'-Wno-error=3Darray-bounds' '-Wno-error=3Dcoverage-mismatch'
'-Wno-error=3Dfree-nonheap-object' '-Wno-error=3Dclass-memaccess'
'-Wno-error=3Ddeprecated-copy' '-Wno-error=3Dshadow' '-flto' '-flifetime-ds=
e=3D1'
'-fstack-protector-strong' '-fPIC' '-fno-strict-aliasing' '-ffunction-secti=
ons'
'-fdata-sections' '-fno-exceptions' '-fno-math-errno' '-fomit-frame-pointer'
'-funwind-tables'

while Unified_cpp_mfbt0.o:

'-fno-openmp' '-fno-openacc' '-mtune=3Dgeneric' '-march=3Dx86-64' '-O3'
'-Wno-error=3Dmaybe-uninitialized' '-Wno-error=3Ddeprecated-declarations'
'-Wno-error=3Darray-bounds' '-Wno-error=3Dcoverage-mismatch'
'-Wno-error=3Dfree-nonheap-object' '-Wno-error=3Dclass-memaccess'
'-Wno-error=3Ddeprecated-copy' '-flto' '-flifetime-dse=3D1'
'-fstack-protector-strong' '-fPIC' '-fno-strict-aliasing' '-ffunction-secti=
ons'
'-fdata-sections' '-fno-exceptions' '-fno-math-errno' '-fomit-frame-pointer'
'-funwind-tables' '-fprofile-use' '-fprofile-correction'

the profiles are merged in ipa_merge_profiles where match=3Dfalse due to a
different CFG and we forget to drop back dst->count. I'll prepare a patch f=
or
it.=