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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/67124] New: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu Date: Wed, 05 Aug 2015 09:07:00 -0000 [thread overview] Message-ID: <bug-67124-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67124 Bug ID: 67124 Summary: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization Assignee: unassigned at gcc dot gnu.org Reporter: su at cs dot ucdavis.edu Target Milestone: --- The current gcc trunk miscompiles the following code on x86_64-linux-gnu at -O1, -O2 and -O3 in the 64-bit mode (but not in the 32-bit mode). This is a regression from 5.1.x. $ gcc-trunk -v Using built-in specs. COLLECT_GCC=gcc-trunk COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk --enable-languages=c,c++ --disable-werror --enable-multilib Thread model: posix gcc version 6.0.0 20150804 (experimental) [trunk revision 226592] (GCC) $ $ gcc-trunk -O0 small.c; ./a.out $ gcc-5.1 -O1 small.c; ./a.out $ $ gcc-trunk -O1 small.c $ ./a.out Aborted (core dumped) $ -------------------------------------------------- struct S1 { int:11; char f1; short f2; int f3; int f4; } a[2] = {{0, 0, 0, 0}, {1, 0, 1, 0}}, *b = &a[0]; int main () { struct S1 c = a[1]; c.f2 = 0; *b = c; for (;;) if (c.f1) break; if (a[0].f3 != 1) __builtin_abort (); return 0; }
next reply other threads:[~2015-08-05 9:07 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-08-05 9:07 su at cs dot ucdavis.edu [this message] 2015-08-05 9:15 ` [Bug rtl-optimization/67124] [6 Regression] " mpolacek at gcc dot gnu.org 2015-08-05 11:07 ` [Bug target/67124] " rguenth at gcc dot gnu.org 2015-08-05 13:10 ` mpolacek at gcc dot gnu.org 2015-08-06 21:53 ` [Bug rtl-optimization/67124] " ubizjak at gmail dot com 2015-10-08 8:46 ` [Bug target/67124] " ubizjak at gmail dot com 2015-10-08 11:04 ` [Bug rtl-optimization/67124] " rguenth at gcc dot gnu.org 2015-10-08 13:41 ` ubizjak at gmail dot com
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