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From: "slyfox at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/103202] New: [12 regression] gcc miscompiles ed-1.17 Date: Thu, 11 Nov 2021 23:59:37 +0000 [thread overview] Message-ID: <bug-103202-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103202 Bug ID: 103202 Summary: [12 regression] gcc miscompiles ed-1.17 Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: slyfox at gcc dot gnu.org Target Milestone: --- Created attachment 51774 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51774&action=edit main_loop.c Originally found the problem as a test failure on GNU ed-1.17 test suite. The test fails on gcc-12.0.0 20211107 snapshot and works on gcc-11.2.0 release. I shrunk test down to a single file, but was not able to figure out where the problem pops up: # gcc-11, good: $ ../result-1/bin/gcc -O2 main_loop.c -o a && ./a element 1 element 2 element 3 # gcc-12, bad: $ ../result-2/bin/gcc -O2 main_loop.c -o a && ./a element 1 element 2 $ LANG=C ../result-1/bin/gcc -v Using built-in specs. COLLECT_GCC=/nix/store/gsj6c88q5hf7fmaaym7023q92jvx1i20-gcc-11.2.0/bin/gcc COLLECT_LTO_WRAPPER=/nix/store/gsj6c88q5hf7fmaaym7023q92jvx1i20-gcc-11.2.0/libexec/gcc/x86_64-unknown-linux-gnu/11.2.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: Thread model: posix Supported LTO compression algorithms: zlib gcc version 11.2.0 (GCC) $ LANG=C ../result-2/bin/gcc -v Using built-in specs. COLLECT_GCC=/nix/store/1g16njhrdlhq61qh30c063jdmmz3hv4d-gcc-12.0.0/bin/gcc COLLECT_LTO_WRAPPER=/nix/store/1g16njhrdlhq61qh30c063jdmmz3hv4d-gcc-12.0.0/libexec/gcc/x86_64-unknown-linux-gnu/12.0.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: Thread model: posix Supported LTO compression algorithms: zlib gcc version 12.0.0 20211107 (experimental) (GCC)
next reply other threads:[~2021-11-11 23:59 UTC|newest] Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-11 23:59 slyfox at gcc dot gnu.org [this message] 2021-11-12 0:01 ` [Bug tree-optimization/103202] " pinskia at gcc dot gnu.org 2021-11-12 0:05 ` pinskia at gcc dot gnu.org 2021-11-12 1:38 ` pinskia at gcc dot gnu.org 2021-11-12 7:43 ` rguenth at gcc dot gnu.org 2021-11-12 9:15 ` slyfox at gcc dot gnu.org 2021-11-12 9:33 ` rguenth at gcc dot gnu.org 2021-11-12 9:35 ` [Bug tree-optimization/103202] [12 regression] gcc miscompiles ed-1.17 since r12-3876-g4a960d548b7d7d94 marxin at gcc dot gnu.org 2021-11-12 10:18 ` aldyh at gcc dot gnu.org 2021-11-12 10:19 ` aldyh at gcc dot gnu.org 2021-11-12 15:23 ` aldyh at gcc dot gnu.org 2021-11-12 15:24 ` aldyh at gcc dot gnu.org 2021-11-12 16:42 ` slyfox at gcc dot gnu.org 2021-11-12 19:46 ` cvs-commit at gcc dot gnu.org 2021-11-12 19:47 ` aldyh at gcc dot gnu.org
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