https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83321
Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[7/8 Regression] |[8 Regression] Conditional
|Conditional jump or move |jump or move depends on
|depends on uninitialised |uninitialised value in
|value in ira.c/ira-color.c |ira.c/ira-color.c
--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
No sorry, gcc-7 is fine. Only happens on trunk.
Here's a testcase:
trippels@gcc67 ~ % cat test.i
int foo(int i) {
if (i)
return 0;
return 1;
}
trippels@gcc67 ~ % valgrind --track-origins=yes --trace-children=yes gcc -c -O2
test.i
==25182== Memcheck, a memory error detector
==25182== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==25182== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==25182== Command: /home/trippels/gcc_test/usr/local/bin/gcc -c -O2 test.i
==25182==
==25184== Memcheck, a memory error detector
==25184== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==25184== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==25184== Command:
/home/trippels/gcc_test/usr/local/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/cc1
-fpreprocessed test.i -quiet -dumpbase test.i -mtune=generic -march=x86-64
-auxbase test -O2 -o /home/trippels/tmp/ccOBBcep.s
==25184==
==25184== Conditional jump or move depends on uninitialised value(s)
==25184== at 0xBB45AD: update_costs_from_copies(ira_allocno*, bool, bool)
(ira-color.c:1434)
...
