https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117200
Bug ID: 117200
Summary: [15 Regression] wrong code with vector compare / mask
/ shift at -O1
Product: gcc
Version: 15.0
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 59378
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59378&action=edit
reduced testcase
This seems to be a recent regression.
r15-4369 OK
r15-4387 OK
r15-4403 BAD
r15-4420 BAD
Output:
$ x86_64-pc-linux-gnu-gcc -O testcase.c
$ ./a.out
Aborted
The interesting diff between OK and BAD seems to be:
--- OK.s 2024-10-18 06:05:28.841686520 +0200
+++ BAD.s 2024-10-18 06:05:40.961703448 +0200
...
- pandn xmm0, xmm1 # tmp110, tmp108
+ pandn xmm1, xmm0 # tmp108, tmp107
...
$ 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-r15-4420-20241018102019-ge3257c12b78-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/15.0.0/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 --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r15-4420-20241018102019-ge3257c12b78-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20241016 (experimental) (GCC)
