For sources which can't use any vector instructions, <x86intrin.h> and
<immintrin.h> cannot be included for compiler intrinsics:
$ echo "#include <x86intrin.h>" | gcc -S -O2 -mno-sse -mno-mmx -x c -
In file included from /usr/include/stdlib.h:1013,
from /usr/lib/gcc/x86_64-redhat-linux/10/include/mm_malloc.h:27,
from /usr/lib/gcc/x86_64-redhat-linux/10/include/xmmintrin.h:34,
from /usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h:29,
from /usr/lib/gcc/x86_64-redhat-linux/10/include/x86intrin.h:32,
from <stdin>:1:
/usr/include/bits/stdlib-float.h: In function ‘atof’:
/usr/include/bits/stdlib-float.h:26:1: error: SSE register return with SSE disabled
26 | {
| ^
$
libgcc/config/i386/shadow-stack-unwind.h has a workaround:
/* NB: We need _get_ssp and _inc_ssp from <cetintrin.h>. But we can't
include <x86intrin.h> which ends up including <mm_malloc.h>, which
includes <stdlib.h> and <errno.h> unconditionally. But we can't
include any libc system headers unconditionally from libgcc. Avoid
including <mm_malloc.h> here by defining _IMMINTRIN_H_INCLUDED. */
#define _IMMINTRIN_H_INCLUDED
#include <cetintrin.h>
#undef _IMMINTRIN_H_INCLUDED
Add a standalone intrinsic header file, <x86gprintrin.h>, to provide
integer only intrinsics. All integer only intrinsics are placed in
<x86gprintrin.h>. <x86intrin.h> and <immintrin.h> simply include
<x86gprintrin.h>.
gcc/
PR target/97148
* config.gcc (extra_headers): Add x86gprintrin.h.
* config/i386/adxintrin.h: Check _X86GPRINTRIN_H_INCLUDED for
<x86gprintrin.h>.
* config/i386/bmi2intrin.h: Likewise.
* config/i386/bmiintrin.h: Likewise.
* config/i386/cetintrin.h: Likewise.
* config/i386/cldemoteintrin.h: Likewise.
* config/i386/clflushoptintrin.h: Likewise.
* config/i386/clwbintrin.h: Likewise.
* config/i386/enqcmdintrin.h: Likewise.
* config/i386/fxsrintrin.h: Likewise.
* config/i386/ia32intrin.h: Likewise.
* config/i386/lwpintrin.h: Likewise.
* config/i386/lzcntintrin.h: Likewise.
* config/i386/movdirintrin.h: Likewise.
* config/i386/pconfigintrin.h: Likewise.
* config/i386/pkuintrin.h: Likewise.
* config/i386/rdseedintrin.h: Likewise.
* config/i386/rtmintrin.h: Likewise.
* config/i386/serializeintrin.h: Likewise.
* config/i386/tbmintrin.h: Likewise.
* config/i386/tsxldtrkintrin.h: Likewise.
* config/i386/waitpkgintrin.h: Likewise.
* config/i386/wbnoinvdintrin.h: Likewise.
* config/i386/xsavecintrin.h: Likewise.
* config/i386/xsaveintrin.h: Likewise.
* config/i386/xsaveoptintrin.h: Likewise.
* config/i386/xsavesintrin.h: Likewise.
* config/i386/xtestintrin.h: Likewise.
* config/i386/immintrin.h: Include <x86gprintrin.h> instead of
<fxsrintrin.h>, <xsaveintrin.h>, <xsaveoptintrin.h>,
<xsavesintrin.h>, <xsavecintrin.h>, <lzcntintrin.h>,
<bmiintrin.h>, <bmi2intrin.h>, <xtestintrin.h>, <cetintrin.h>,
<movdirintrin.h>, <sgxintrin.h, <pconfigintrin.h>,
<waitpkgintrin.h>, <cldemoteintrin.h>, <enqcmdintrin.h>,
<serializeintrin.h>, <tsxldtrkintrin.h>, <adxintrin.h>,
<clwbintrin.h>, <clflushoptintrin.h>, <wbnoinvdintrin.h> and
<pkuintrin.h>.
(_wbinvd): Moved to config/i386/x86gprintrin.h.
(_rdrand16_step): Likewise.
(_rdrand32_step): Likewise.
(_rdpid_u32): Likewise.
(_readfsbase_u32): Likewise.
(_readfsbase_u64): Likewise.
(_readgsbase_u32): Likewise.
(_readgsbase_u64): Likewise.
(_writefsbase_u32): Likewise.
(_writefsbase_u64): Likewise.
(_writegsbase_u32): Likewise.
(_writegsbase_u64): Likewise.
(_rdrand64_step): Likewise.
(_ptwrite64): Likewise.
(_ptwrite32): Likewise.
* config/i386/x86gprintrin.h: New file.
* config/i386/x86intrin.h: Include <x86gprintrin.h>. Don't
include <ia32intrin.h>, <lwpintrin.h>, <tbmintrin.h>,
<popcntintrin.h>, <mwaitxintrin.h> and <clzerointrin.h>.
gcc/testsuite/
* gcc.target/i386/avx-1.c (__builtin_ia32_lwpval32): New to
support <lwpintrin.h> included in <x86gprintrin.h>.
(__builtin_ia32_lwpval64): Likewise.
(__builtin_ia32_lwpins32): Likewise.
(__builtin_ia32_lwpins64): Likewise.
(__builtin_ia32_bextri_u32): New to support <tbmintrin.h>
included in <x86gprintrin.h>.
(__builtin_ia32_bextri_u64): Likewise.
* gcc.target/i386/x86gprintrin-1.c: New test.
* gcc.target/i386/x86gprintrin-2.c: Likewise.
* gcc.target/i386/x86gprintrin-3.c: Likewise.
* gcc.target/i386/x86gprintrin-4.c: Likewise.
* gcc.target/i386/x86gprintrin-4a.c: Likewise.
* gcc.target/i386/x86gprintrin-5.c: Likewise.
* gcc.target/i386/x86gprintrin-5a.c: Likewise.
* gcc.target/i386/x86gprintrin-5b.c: Likewise.
* gcc.target/i386/x86gprintrin-6.c: Likewise.
libgcc/
PR target/97148
* config/i386/shadow-stack-unwind.h: Include <x86gprintrin.h>
instead of <cetintrin.h>.
59a95143dd