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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109504] [12/13 Regression] Compilation fails with pragma
 GCC target sse4.1 and immintrin.h
Date: Fri, 14 Apr 2023 08:01:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109504

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah.  Enable all the time and have say the
targetm.invalid_conversion, targetm.invalid_unary_op, targetm.invalid_binar=
y_op
and something in argument/return value passing reject _Float16/__bf16 in
functions without SSE2.
That will not be enough though, we'll need to arrange e.g. for the spot whe=
re
we #undef/#define target  macros based on currently active ISA in pragmas to
also
do that for __STDCPP_FLOAT16_T__ and __STDCPP_BFLOAT16_T__ for C++, and cha=
nge
libstdc++
such that for x86 it adds similarly to x86 intrin headers something like
#ifndef __SSE2__
#pragma GCC push_options
#pragma GCC target("sse2")
#define __DISABLE_SSE2__
#endif /* __SSE2__ */
...
#ifdef __DISABLE_SSE2__
#undef __DISABLE_SSE2__
#pragma GCC pop_options
#endif /* __DISABLE_SSE2__ */
around std::float16_t/std::bfloat16_t stuff.
Definitely not stage4 material I'm afraid.=