[Bug target/84377] gcc-7.3.0 miscompiles truncf128@@GLIBC_2.26 in libm.so
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84377 Andrew Pinski changed: What|Removed |Added Resolution|--- |DUPLICATE Status|UNCONFIRMED |RESOLVED --- Comment #6 from Andrew Pinski --- Dup of bug 81763 in the end. *** This bug has been marked as a duplicate of bug 81763 ***
[Bug target/84377] gcc-7.3.0 miscompiles truncf128@@GLIBC_2.26 in libm.so
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84377 --- Comment #5 from Andrew Pinski --- The gimple level is the same: ``` _5 = 281474976710655 >> j0_20; _6 = ~_5; _7 = (long long unsigned int) _6; _8 = _7 & _35; qw_u.parts64.msw = _8; qw_u.parts64.lsw = 0; ``` The place where it changes first between GCC 7.3 and 7.4 is IRA.
[Bug target/84377] gcc-7.3.0 miscompiles truncf128@@GLIBC_2.26 in libm.so
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84377 --- Comment #4 from Andrew Pinski --- GCC 7.3.0: ``` .loc 1 42 0 discriminator 2 movl$65535, %edi movl$-1, %esi movl$0, 48(%esp) shrdl %edi, %esi testb $32, %cl sarx%ecx, %edi, %edi movl$0, 52(%esp) cmovne %edi, %esi andn%eax, %esi, %esi andn%edx, %esi, %edi movl%esi, 56(%esp) movl%edi, 60(%esp) vmovdqa 48(%esp), %xmm3 vmovaps %xmm3, (%esp) ``` GCC 7.4.0: ``` .loc 1 42 0 discriminator 2 movl$65535, %edi movl$-1, %esi movl$0, 48(%esp) shrdl %edi, %esi sarx%ecx, %edi, %edi movl%edi, %ebx movl$0, 52(%esp) sarl$31, %ebx testb $32, %cl cmovne %edi, %esi cmovne %ebx, %edi andn%eax, %esi, %esi andn%edx, %edi, %edi movl%esi, 56(%esp) movl%edi, 60(%esp) vmovdqa 48(%esp), %xmm3 vmovaps %xmm3, (%esp) ```
[Bug target/84377] gcc-7.3.0 miscompiles truncf128@@GLIBC_2.26 in libm.so
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84377 Andrew Pinski changed: What|Removed |Added Known to work||7.4.0, 7.5.0, 8.1.0 Known to fail||7.3.0 --- Comment #3 from Andrew Pinski --- So I can reproduce it with GCC 7.3.0 with: ``` -xc -march=skylake -mmmx -mno-3dnow -msse -msse2 -msse3 -mssse3 -mno-sse4a -mcx16 -msahf -mmovbe -maes -mno-sha -mpclmul -mpopcnt -mabm -mno-lwp -mfma -mno-fma4 -mno-xop -mbmi -msgx -mbmi2 -mno-tbm -mavx -mavx2 -msse4.2 -msse4.1 -mlzcnt -mrtm -mhle -mrdrnd -mf16c -mfsgsbase -mrdseed -mprfchw -madx -mfxsr -mxsave -mxsaveopt -mno-avx512f -mno-avx512er -mno-avx512cd -mno-avx512pf -mno-prefetchwt1 -mclflushopt -mxsavec -mxsaves -mno-avx512dq -mno-avx512bw -mno-avx512vl -mno-avx512ifma -mno-avx512vbmi -mno-avx5124fmaps -mno-avx5124vnniw -mno-clwb -mno-mwaitx -mno-clzero -mno-pku -mno-rdpid -m32 -O2 -std=gnu11 -fgnu89-inline -fmerge-all-constants -fno-strict-aliasing -frounding-math -fstack-protector-all -mpreferred-stack-boundary=4 -fPIC ``` But it passes with GCC 7.4.0.
[Bug target/84377] gcc-7.3.0 miscompiles truncf128@@GLIBC_2.26 in libm.so
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84377 --- Comment #2 from Andreas K. Huettel --- > > but it doesn't fail for me, does it for you? Yes it fails here. (~amd64 chroot) pinacolada ~/test # gcc -m32 -O2 -std=gnu11 -fgnu89-inline -fno-strict-aliasing -frounding-math -fstack-protector-all -march=native -fPIC pr84377-test.c pr84377.i -o pr84377-test (~amd64 chroot) pinacolada ~/test # ./pr84377-test Abgebrochen (~amd64 chroot) pinacolada ~/test # (=Aborted) > What does -march=native expand > for you (add -v and show the options passed to cc1)? (~amd64 chroot) pinacolada ~/test # LANG=C gcc -v -m32 -O2 -std=gnu11 -fgnu89-inline -fno-strict-aliasing -frounding-math -fstack-protector-all -march=native -fPIC pr84377-test.c pr84377.i -o pr84377-test Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /var/tmp/portage/sys-devel/gcc-7.3.0/work/gcc-7.3.0/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include/g++-v7 --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/python --enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 7.3.0 p1.0' --disable-esp --enable-libstdcxx-time --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64 --disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj --enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts --disable-libmpx --enable-vtable-verify --enable-libvtv --enable-lto --without-isl --enable-libsanitizer --enable-default-pie --enable-default-ssp Thread model: posix gcc version 7.3.0 (Gentoo 7.3.0 p1.0) COLLECT_GCC_OPTIONS='-v' '-m32' '-O2' '-std=gnu11' '-fgnu89-inline' '-fno-strict-aliasing' '-frounding-math' '-fstack-protector-all' '-march=native' '-fPIC' '-o' 'pr84377-test' /usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1 -quiet -v -imultilib 32 pr84377-test.c -march=skylake -mmmx -mno-3dnow -msse -msse2 -msse3 -mssse3 -mno-sse4a -mcx16 -msahf -mmovbe -maes -mno-sha -mpclmul -mpopcnt -mabm -mno-lwp -mfma -mno-fma4 -mno-xop -mbmi -msgx -mbmi2 -mno-tbm -mavx -mavx2 -msse4.2 -msse4.1 -mlzcnt -mrtm -mhle -mrdrnd -mf16c -mfsgsbase -mrdseed -mprfchw -madx -mfxsr -mxsave -mxsaveopt -mno-avx512f -mno-avx512er -mno-avx512cd -mno-avx512pf -mno-prefetchwt1 -mclflushopt -mxsavec -mxsaves -mno-avx512dq -mno-avx512bw -mno-avx512vl -mno-avx512ifma -mno-avx512vbmi -mno-avx5124fmaps -mno-avx5124vnniw -mno-clwb -mno-mwaitx -mno-clzero -mno-pku -mno-rdpid --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=8192 -mtune=skylake -quiet -dumpbase pr84377-test.c -m32 -auxbase pr84377-test -O2 -std=gnu11 -version -fgnu89-inline -fno-strict-aliasing -frounding-math -fstack-protector-all -fPIC -o /tmp/ccxL6T9P.s GNU C11 (Gentoo 7.3.0 p1.0) version 7.3.0 (x86_64-pc-linux-gnu) compiled by GNU C version 7.3.0, GMP version 6.1.2, MPFR version 3.1.6, MPC version 1.1.0, isl version none GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 ignoring nonexistent directory "/usr/local/include" ignoring nonexistent directory "/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/../../../../x86_64-pc-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include /usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include-fixed /usr/include End of search list. GNU C11 (Gentoo 7.3.0 p1.0) version 7.3.0 (x86_64-pc-linux-gnu) compiled by GNU C version 7.3.0, GMP version 6.1.2, MPFR version 3.1.6, MPC version 1.1.0, isl version none GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: d1cccfcc83f321cbb1113d0d0df65594 COLLECT_GCC_OPTIONS='-v' '-m32' '-O2' '-std=gnu11' '-fgnu89-inline' '-fno-strict-aliasing' '-frounding-math' '-fstack-protector-all' '-march=native' '-fPIC' '-o' 'pr84377-test' /usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/../../../../x86_64-pc-linux-gnu/bin/as -v --32 -o /tmp/cclwtFas.o /tmp/ccxL6T9P.s GNU assembler version 2.29.1 (x86_64-pc-linux-gnu) using BFD version (Gentoo 2.29.1 p3) 2.29.1 COLLECT_GCC_OPTIONS='-v' '-m32' '-O2' '-std=gnu11' '-fgnu89-inline' '-fno-strict-aliasing' '-frounding-math' '-fstack-protector-all' '-march=native' '-fPIC' '-o' 'pr84377-test' /usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1 -fpreprocessed pr84377.i -march=skylake
