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Update comments for PowerPC

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Jeffrey Walton 2018-11-24 02:14:28 -05:00
parent 51fea1a15e
commit ad58f0cbdc
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1 changed files with 18 additions and 3 deletions
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21
ppc_simd.h
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@ -17,9 +17,24 @@
/// change helped consolidate two slightly different implementations.
/// \since Crypto++ 6.0, LLVM Clang compiler support since Crypto++ 8.0
// Use __ALTIVEC__, _ARCH_PWR7 and _ARCH_PWR8 when detecting actual availaibility
// of the feature for the source file being compiled. The preprocessor macros
// depend on compiler options like -maltivec; and not compiler versions.
// Use __ALTIVEC__, _ARCH_PWR7 and _ARCH_PWR8 when detecting actual
// availaibility of the feature for the source file being compiled. The
// preprocessor macros depend on compiler options like -maltivec; and
// not compiler versions.
// DO NOT USE this pattern in VecLoad and VecStore. We have to use the
// spahetti code tangled in preprocessor macros because XLC 12 generates
// bad code in some places. To verify the bad code generation test on
// GCC111 with XLC 12.01 installed. XLC 13 on GCC112 and GCC119 is OK.
//
// inline uint32x4_p VecLoad(const byte src[16])
// {
// #if defined(_ARCH_PWR7)
// return (uint32x4_p) *(uint8x16_p*)((byte*)src);
// #else
// return VecLoad_ALTIVEC(src);
// #endif
// }
#ifndef CRYPTOPP_PPC_CRYPTO_H
#define CRYPTOPP_PPC_CRYPTO_H