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* [Bug target/111534] New: [14 Regression] wrong code with -mgeneral-regs-only and vector compare
@ 2023-09-22 5:05 zsojka at seznam dot cz
2023-09-22 5:21 ` [Bug target/111534] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: zsojka at seznam dot cz @ 2023-09-22 5:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111534
Bug ID: 111534
Summary: [14 Regression] wrong code with -mgeneral-regs-only
and vector compare
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 55966
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55966&action=edit
reduced testcase
This might be the same as PR110817, but here only a target option impacts the
behavior, and no other optimizations are enabled.
$ x86_64-pc-linux-gnu-gcc -mgeneral-regs-only testcase.c && ./a.out
Aborted
$ 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-r14-4218-20230922114852-ge446ed29f6c-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/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
--disable-bootstrap --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-r14-4218-20230922114852-ge446ed29f6c-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20230922 (experimental) (GCC)
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/111534] [14 Regression] wrong code with -mgeneral-regs-only and vector compare
2023-09-22 5:05 [Bug target/111534] New: [14 Regression] wrong code with -mgeneral-regs-only and vector compare zsojka at seznam dot cz
@ 2023-09-22 5:21 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-22 5:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111534
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
_5 = BIT_FIELD_REF <_1, 8, 0>;
_6 = _5 != 0;
_7 = _5 == 0;
_8 = (signed char) _7;
_9 = (signed char) _5;
_10 = _9 + -1;
It is the same.
>here only a target option impacts the behavior
Because -mgeneral-regs-only basically is -mno-sse which also shows the issue.
Basicaly is the lowering of the vector comparison (combined with the referenced
match pattern in the other bug report) which is causing the issue.
*** This bug has been marked as a duplicate of bug 110817 ***
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-09-22 5:05 [Bug target/111534] New: [14 Regression] wrong code with -mgeneral-regs-only and vector compare zsojka at seznam dot cz
2023-09-22 5:21 ` [Bug target/111534] " pinskia at gcc dot gnu.org
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