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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/97386] New: [8/9/10/11 Regression] wrong code with __builtin_bswap16() of rotated 64bit value Date: Mon, 12 Oct 2020 14:38:17 +0000 [thread overview] Message-ID: <bug-97386-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97386 Bug ID: 97386 Summary: [8/9/10/11 Regression] wrong code with __builtin_bswap16() of rotated 64bit value Product: gcc Version: 11.0 Status: UNCONFIRMED Keywords: wrong-code Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: zsojka at seznam dot cz Target Milestone: --- Created attachment 49353 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49353&action=edit reduced testcase Output: $ x86_64-pc-linux-gnu-gcc -O testcase.c $ ./a.out Aborted The code in fact rotates 0xcccc00 instead of 0xcccc. foo: mov rcx, QWORD PTR c[rip] mov eax, 13421568 # 0xcccc00 rol rax, cl ret $ x86_64-pc-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r11-3806-20201012001625-g2baa36d4911-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++ --enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra --with-cloog --with-ppl --with-isl --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld --with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch --prefix=/repo/gcc-trunk//binary-trunk-r11-3806-20201012001625-g2baa36d4911-checking-yes-rtl-df-extra-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 11.0.0 20201012 (experimental) (GCC)
next reply other threads:[~2020-10-12 14:38 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-12 14:38 zsojka at seznam dot cz [this message] 2020-10-12 18:04 ` [Bug tree-optimization/97386] " jakub at gcc dot gnu.org 2020-10-12 19:52 ` jakub at gcc dot gnu.org 2020-10-12 19:56 ` jakub at gcc dot gnu.org 2020-10-13 17:14 ` cvs-commit at gcc dot gnu.org 2020-10-16 11:37 ` cvs-commit at gcc dot gnu.org 2020-10-16 11:38 ` [Bug tree-optimization/97386] [8/9 " jakub at gcc dot gnu.org 2021-04-20 23:29 ` cvs-commit at gcc dot gnu.org 2021-04-22 16:48 ` cvs-commit at gcc dot gnu.org 2021-04-22 17:07 ` jakub at gcc dot gnu.org
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