https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101384
Bug ID: 101384
Summary: wrong code at -Og and above with vector shift/multiply
Product: gcc
Version: 12.0
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: powerpc64le-unknown-linux-gnu
Created attachment 51121
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51121&action=edit
reduced testcase
Output:
$ powerpc64le-unknown-linux-gnu-gcc -Og testcase.c -Wno-psabi -static
$ qemu-ppc64le -- ./a.out
qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted
The vector is:
80808080808080808080808080808080
instead of
80ffffff80ffffff80ffffff80ffffff
# testcase.c:13: }
vspltisw 0,-1 # tmp121
vslb 0,0,0 # tmp121, tmp121, tmp121
looks strange, but simply replacing vslb->vslw doesn't help, as another operand
with 7s for the shift would be needed
$ powerpc64le-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-powerpc64le/bin/powerpc64le-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-2137-20210708114755-g4c619132b3f-checking-yes-rtl-df-extra-powerpc64le/bin/../libexec/gcc/powerpc64le-unknown-linux-gnu/12.0.0/lto-wrapper
Target: powerpc64le-unknown-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
--with-sysroot=/usr/powerpc64le-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=powerpc64le-unknown-linux-gnu
--with-ld=/usr/bin/powerpc64le-unknown-linux-gnu-ld
--with-as=/usr/bin/powerpc64le-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r12-2137-20210708114755-g4c619132b3f-checking-yes-rtl-df-extra-powerpc64le
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20210708 (experimental) (GCC)
