https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99862
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Zhendong Su from comment #0)
> [561] % gcctk -v
> Using built-in specs.
> COLLECT_GCC=gcctk
> COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/
> x86_64-pc-linux-gnu/11.0.1/lto-wrapper
> Target: x86_64-pc-linux-gnu
> Configured with: ../gcc-trunk/configure --disable-bootstrap
> --prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++
> --disable-werror --enable-multilib --with-system-zlib
> Thread model: posix
> Supported LTO compression algorithms: zlib
> gcc version 11.0.1 20210401 (experimental) [master revision
> e4bb1bd60a9:c23a685bf70:95d217ab52d31dc06fda42fc136dea165909e88b] (GCC)
> [562] %
> [562] % gcctk -O1 -S -o O1.s small.c
> [563] % gcctk -O3 -S -o O3.s small.c
> [564] %
> [564] % wc O1.s O3.s
> 23 45 420 O1.s
> 39 74 669 O3.s
> 62 119 1089 total
> [565] %
> [565] % grep foo O1.s
> [566] % grep foo O3.s
> call foo
> [567] %
> [567] % cat small.c
> extern void foo(void);
> static int a, b;
> static int c() {
> foo();
> while (1)
> while (b)
> foo();
> }
> void d() {
> if (a)
> c();
> }
> int main() {
> d();
> return 0;
> }
I filed this as PR99991.
