https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97653
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #9)
> [test@ibm-p8-cluster-02 ~]$ cat 97653.c
> int printf(const char*, ...);
>
> const unsigned long k = 256;
>
> int main()
> {
> long double r[] = { 0.1L, 0.2L, 0.5L, 0.9L };
> for (int i = 0; i < 4; ++i)
> {
> unsigned long j = k * r[i];
> printf("%lu * %Lf = %lu\n", k, r[i], j);
> }
> }
> [test@ibm-p8-cluster-02 ~]$ ~/gcc/ieee/bin/gcc 97653.c -mno-gnu-attribute
> -mabi=ibmlongdouble -Wall -static-libgcc -v && ./a.out
> Using built-in specs.
> COLLECT_GCC=/home/test/gcc/ieee/bin/gcc
> COLLECT_LTO_WRAPPER=/home/test/gcc/ieee/libexec/gcc/powerpc64le-unknown-
> linux-gnu/11.0.1/lto-wrapper
> Target: powerpc64le-unknown-linux-gnu
> Configured with: /home/test/src/gcc/configure --prefix=/home/test/gcc/ieee
> --disable-multilib --disable-bootstrap --enable-languages=c++ --disable-pch
> --disable-nls --without-isl --with-long-double-format=ieee : (reconfigured)
> /home/test/src/gcc/configure --prefix=/home/test/gcc/ieee --disable-multilib
> --disable-bootstrap --enable-languages=c++ --disable-pch --disable-nls
> --without-isl --with-long-double-format=ieee
Is your compiler intentionally configured without --with-long-double-128, i.e.
are you intentionally testing the double == long double case?
I can reproduce the weirdo output only when I build with such configured
cross-compiler (without -mlong-double-128) and link on gcc112 on CompilerFarm
with the system compiler (which defaults to -mlong-double-128).
