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Jeffrey Walton 2019-08-19 08:30:11 -04:00
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commit 8130bd7a24
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1 changed files with 6 additions and 5 deletions
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darn.h
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@ -2,11 +2,12 @@
// DARN requires POWER9/ISA 3.0.
// At the moment only GCC 7.0 (and above) seems to support __builtin_darn()
// and __builtin_darn_32(). Clang 7.0 does not provide them, but it does
// support assembly instructions. XLC is unknown, but there are no hits when
// searching IBM's site. To cover more platforms we provide GCC inline
// assembly like we do with RDRAND and RDSEED. Platforms that don't support
// GCC inline assembly or the builtin will fail the compile. Also see
// and __builtin_darn_32(). However, GCC generates incorrect code. Clang 7.0
// does not provide them, but it does support assembly instructions. XLC is
// unknown, but there are no hits when searching IBM's site. To cover more
// platforms we provide GCC inline assembly like we do with RDRAND and RDSEED.
// Platforms that don't support GCC inline assembly or the builtin will fail
// to compile. Also see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481 and
// https://gcc.gnu.org/onlinedocs/gcc/Basic-PowerPC-Built-in-Functions-Available-on-ISA-3_002e0.html
/// \file darn.h