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From: "crazylht at gmail dot com" <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: Mon, 17 Apr 2023 06:37:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109504

--- Comment #6 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Jakub Jelinek from comment #4)
> Yeah.  Enable all the time and have say the
> targetm.invalid_conversion, targetm.invalid_unary_op,
> targetm.invalid_binary_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
> where 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
> change libstdc++
> such that for x86 it adds similarly to x86 intrin headers something like
Can we just cpp_undef _STDCPP_FLOAT16_T__ and __STDCPP_BFLOAT16_T__ for C++=
 in
ix86_target_macros when !TARGET_SSE2 so that no need to change libstdc++ pa=
rt.=