gcc 11 with -O2 + aarch64: x86/avx512/subs/emul/{c,cpp}, x86/sse2/emul/{c,cpp} failures

[junaruga]

On the latest master branch commit: df63f88a364da6be3963b4924c327b12f88d7748 with gcc 11 with the following flags on Fedora rawhide (= 35) aarch64 (ARM 64-bit), I faced the following failures. This failures do not happen with the gcc 11 without flags (no CFLAGS and no CXXFLAGS).

Could you take a look? Thanks.

+ CC='gcc -fno-strict-aliasing'
+ CXX='g++ -fno-strict-aliasing'
+ CFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -mbranch-protection=standard -fasynchronous-unwind-tables -fstack-clash-protection'
+ CXXFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -mbranch-protection=standard -fasynchronous-unwind-tables -fstack-clash-protection'
+ meson setup build/gcc-with-flags
The Meson build system
Version: 0.57.1
Source dir: /builddir/build/BUILD/simde-df63f88a364da6be3963b4924c327b12f88d7748
Build dir: /builddir/build/BUILD/simde-df63f88a364da6be3963b4924c327b12f88d7748/build/gcc-with-flags
Build type: native build
Project name: SIMDe
Project version: 0.7.3
C compiler for the host machine: gcc -fno-strict-aliasing (gcc 11.0.0 "gcc (GCC) 11.0.0 20210210 (Red Hat 11.0.0-0)")
C linker for the host machine: gcc -fno-strict-aliasing ld.bfd 2.35.1-34
C++ compiler for the host machine: g++ -fno-strict-aliasing (gcc 11.0.0 "g++ (GCC) 11.0.0 20210210 (Red Hat 11.0.0-0)")
C++ linker for the host machine: g++ -fno-strict-aliasing ld.bfd 2.35.1-34
Host machine cpu family: aarch64
Host machine cpu: aarch64
Library m found: YES
Compiler for C supports arguments -fopenmp-simd: YES 
Compiler for C++ supports arguments -fopenmp-simd: YES 
Compiler for C supports arguments -Wpsabi: YES 
Compiler for C++ supports arguments -Wpsabi: YES 
Library m found: YES
Build targets in project: 882
Found ninja-1.10.2 at /usr/bin/ninja

+ ninja -C build/gcc-with-flags -v -j 4

+ meson test -C build/gcc-with-flags -q --no-rebuild --print-errorlogs
▶ 276/882 subs/mm512_subs_epu8             FAIL          
▶ 276/882 subs/mm512_mask_subs_epu8        FAIL          
▶ 276/882 subs/mm512_maskz_subs_epu8       FAIL          
276/882 x86/avx512/subs/emul/c             ERROR           0.05s   exit status 1
>>> MALLOC_PERTURB_=154 /builddir/build/BUILD/simde-df63f88a364da6be3963b4924c327b12f88d7748/build/gcc-with-flags/test/x86/avx512/subs-emul-c
――――――――――――――――――――――――――――――――――――― ✀  ―――――――――――――――――――――――――――――――――――――
stderr:
../../test/x86/avx512/subs.c:1988: assertion failed: r[2] == test_vec[i].r[2] (214 == 0)
../../test/x86/avx512/subs.c:2527: assertion failed: r[1] == test_vec[i].r[1] (195 == 0)
../../test/x86/avx512/subs.c:2937: assertion failed: r[2] == test_vec[i].r[2] (181 == 0)
(test program exited with status code 1)
――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
▶ 281/882 subs/mm512_subs_epu8             FAIL          
▶ 281/882 subs/mm512_mask_subs_epu8        FAIL          
▶ 281/882 subs/mm512_maskz_subs_epu8       FAIL          
281/882 x86/avx512/subs/emul/cpp           ERROR           0.07s   exit status 1
>>> MALLOC_PERTURB_=50 /builddir/build/BUILD/simde-df63f88a364da6be3963b4924c327b12f88d7748/build/gcc-with-flags/test/x86/avx512/subs-emul-cpp
――――――――――――――――――――――――――――――――――――― ✀  ―――――――――――――――――――――――――――――――――――――
stderr:
test/x86/avx512/subs.cpp:1988: assertion failed: r[2] == test_vec[i].r[2] (214 == 0)
test/x86/avx512/subs.cpp:2527: assertion failed: r[1] == test_vec[i].r[1] (195 == 0)
test/x86/avx512/subs.cpp:2937: assertion failed: r[2] == test_vec[i].r[2] (181 == 0)
(test program exited with status code 1)
――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
▶ 311/882 sse2/mm_subs_epu8                FAIL          
▶ 312/882 sse2/mm_subs_epu8                FAIL          
311/882 x86/sse2/emul/c                    ERROR           0.10s   exit status 1
>>> MALLOC_PERTURB_=63 /builddir/build/BUILD/simde-df63f88a364da6be3963b4924c327b12f88d7748/build/gcc-with-flags/test/x86/sse2-emul-c
――――――――――――――――――――――――――――――――――――― ✀  ―――――――――――――――――――――――――――――――――――――
stderr:
../../test/x86/sse2.c:9184: assertion failed: r[4] == test_vec[i].r[4] (185 == 0)
(test program exited with status code 1)
――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
312/882 x86/sse2/emul/cpp                  ERROR           0.11s   exit status 1
>>> MALLOC_PERTURB_=41 /builddir/build/BUILD/simde-df63f88a364da6be3963b4924c327b12f88d7748/build/gcc-with-flags/test/x86/sse2-emul-cpp
――――――――――――――――――――――――――――――――――――― ✀  ―――――――――――――――――――――――――――――――――――――
stderr:
test/x86/sse2.cpp:9184: assertion failed: r[4] == test_vec[i].r[4] (185 == 0)
(test program exited with status code 1)
――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
Summary of Failures:
276/882 x86/avx512/subs/emul/c             ERROR           0.05s   exit status 1
281/882 x86/avx512/subs/emul/cpp           ERROR           0.07s   exit status 1
311/882 x86/sse2/emul/c                    ERROR           0.10s   exit status 1
312/882 x86/sse2/emul/cpp                  ERROR           0.11s   exit status 1
Ok:                 878 
Expected Fail:      0   
Fail:               4   
Unexpected Pass:    0   
Skipped:            0   
Timeout:            0   

[junaruga]

This issue also happens on gcc 11 with only -O2 flag (CFLAGS="-O2", CXXFLAGS="-O2").

[junaruga]

Thanks! I confirmed it was fixed on the latest master.