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libstdc++: ppc: conditionalize vsx-only simd intrinsics 

libstdc++'s bits/simd.h section for PowerPC, guarded by __ALTIVEC__,
defines various intrinsic vector types that are only available with
__VSX__: 64-bit long double, double, (un)signed long long, and 64-bit
(un)signed long.

experimental/simd/standard_abi_usable{,_2}.cc tests error out
reporting the unmet requirements when the target cpu doesn't enable
VSX.  Make the reported instrinsic types conditional on __VSX__ so
that <experimental/simd> can be used on PowerPC variants that do not
support VSX.


for  libstdc++-v3/ChangeLog

	* include/experimental/bits/simd.h [__ALTIVEC__]: Require VSX
	for double, long long, and 64-bit long intrinsic types.
	[__ALTIVEC__] (__intrinsic_type): Mention 128-bit in
	preexisting long double diagnostic, adjust no-VSX double
	diagnostic to cover 64-bit long double as well.

(cherry picked from commit 469c76f0d9)
This commit is contained in:
Alexandre Oliva 2022-05-13 03:05:45 -03:00 committed by Alexandre Oliva
parent 05a3929f9c
commit a4183ab7cf
1 changed files with 10 additions and 3 deletions
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13
libstdc++-v3/include/experimental/bits/simd.h
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@ -2430,17 +2430,23 @@ template <typename _Tp>
template <> \
struct __intrinsic_type_impl<_Tp> { using type = __vector _Tp; }
_GLIBCXX_SIMD_PPC_INTRIN(float);
#ifdef __VSX__
_GLIBCXX_SIMD_PPC_INTRIN(double);
#endif
_GLIBCXX_SIMD_PPC_INTRIN(signed char);
_GLIBCXX_SIMD_PPC_INTRIN(unsigned char);
_GLIBCXX_SIMD_PPC_INTRIN(signed short);
_GLIBCXX_SIMD_PPC_INTRIN(unsigned short);
_GLIBCXX_SIMD_PPC_INTRIN(signed int);
_GLIBCXX_SIMD_PPC_INTRIN(unsigned int);
#if defined __VSX__ || __SIZEOF_LONG__ == 4
_GLIBCXX_SIMD_PPC_INTRIN(signed long);
_GLIBCXX_SIMD_PPC_INTRIN(unsigned long);
#endif
#ifdef __VSX__
_GLIBCXX_SIMD_PPC_INTRIN(signed long long);
_GLIBCXX_SIMD_PPC_INTRIN(unsigned long long);
#endif
#undef _GLIBCXX_SIMD_PPC_INTRIN
template <typename _Tp, size_t _Bytes>
@ -2450,10 +2456,11 @@ template <typename _Tp, size_t _Bytes>
static constexpr bool _S_is_ldouble = is_same_v<_Tp, long double>;
// allow _Tp == long double with -mlong-double-64
static_assert(!(_S_is_ldouble && sizeof(long double) > sizeof(double)),
"no __intrinsic_type support for long double on PPC");
"no __intrinsic_type support for 128-bit floating point on PowerPC");
#ifndef __VSX__
static_assert(!is_same_v<_Tp, double>,
"no __intrinsic_type support for double on PPC w/o VSX");
static_assert(!(is_same_v<_Tp, double>
|| (_S_is_ldouble && sizeof(long double) == sizeof(double))),
"no __intrinsic_type support for 64-bit floating point on PowerPC w/o VSX");
#endif
using type =
typename __intrinsic_type_impl<