[Bug target/107304] internal compiler error: in convert_move, at expr.cc:220 with -march=tigerlake

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107304

--- Comment #16 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to H.J. Lu from comment #15)
> (In reply to Hongtao.liu from comment #14)
> > (In reply to H.J. Lu from comment #12)
> > > (In reply to Hongyu Wang from comment #10)
> > > > 
> > > > Clang works properly as it overrides -march= to any target clones. I suppose
> > > > we can do similar things in ix86_valid_target_attribute_p
> > > 
> > > That will be wrong since target attribute can be used to disable vector
> > > instructions.
> > 
> > But target_clones can't?
> > https://godbolt.org/z/jn6GMrdsb
> 
> arch=nehalem will disable AVX.

The question is should command line -mavx -march=nehalem disable avx?
I think the currect implementation only set not clear isa bits.

2173#define DEF_PTA(NAME) \
2174        if (((processor_alias_table[i].flags & PTA_ ## NAME) != 0) \
2175            && PTA_ ## NAME != PTA_64BIT \
2176            && (TARGET_64BIT || PTA_ ## NAME != PTA_UINTR) \
2177            && !TARGET_EXPLICIT_ ## NAME ## _P (opts)) \
2178          SET_TARGET_ ## NAME (opts);
2179#include "i386-isa.def"
2180#undef DEF_PTA