https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103302
Bug ID: 103302
Summary: wrong code with -fharden-compares
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: riscv64-unknown-linux-gnu
Created attachment 51824
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51824&action=edit
reduced testcase
Output:
$ riscv64-unknown-linux-gnu-gcc -Og -fharden-compares -fno-tree-dce
-fno-tree-fre testcase.c -static
$ qemu-riscv64 -- ./a.out
Trace/breakpoint trap
Debugging shows one of the compares on the first statement probably goes wrong:
(gdb)
0x00000000000106ea 19 u32_0 <= (v512u128) (v512u128_0 != u8_0);
(gdb)
0x0000000000010a48 24 }
I could find any other target where this testcase is failing.
$ riscv64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-riscv64/bin/riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-5221-20211113015125-g2f3d43a3515-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/12.0.0/lto-wrapper
Target: riscv64-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/riscv64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=riscv64-unknown-linux-gnu
--with-ld=/usr/bin/riscv64-unknown-linux-gnu-ld
--with-as=/usr/bin/riscv64-unknown-linux-gnu-as --disable-multilib
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r12-5221-20211113015125-g2f3d43a3515-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20211113 (experimental) (GCC)
