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x86/RDSEED: Work around QNX compiler missing the rdseed intrinsic

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Since it's no big deal, we can disable this. Making it use rdseed via
inline assembly or detect when the compiler is fixed is Someone Else's
Problem.

Fixes: QTBUG-104697
Change-Id: I89c4eb48af38408daa7cfffd16feabb5408e2fbf
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
This commit is contained in:
Thiago Macieira 2022-07-04 09:01:47 -07:00
parent 1e4673e8b0
commit 3622fc81ea
2 changed files with 6 additions and 0 deletions
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2
config.tests/x86intrin/main.cpp
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@ -12,7 +12,9 @@ int test(int argc, char **argv)
{
unsigned randomvalue;
_rdrand32_step(&randomvalue); // RDRND (IVB)
#ifndef __QNXNTO__ // buggy compiler is missing this intrinsic, but we allow it
_rdseed32_step(&randomvalue); // RDSEED (BDW)
#endif
unsigned mask = _blsmsk_u32(argc); // BMI (HSW)
int clz = _lzcnt_u32(mask); // LZCNT (HSW)
int ctz = _tzcnt_u32(mask); // BMI (HSW)

4
src/corelib/global/qsimd_p.h
View File

@ -173,6 +173,10 @@ QT_WARNING_DISABLE_INTEL(103)
#ifdef Q_PROCESSOR_X86
/* -- x86 intrinsic support -- */
# if defined(QT_COMPILER_SUPPORTS_RDSEED) && defined(Q_OS_QNX)
// The compiler for QNX is missing the intrinsic
# undef QT_COMPILER_SUPPORTS_RDSEED
# endif
# if defined(Q_CC_MSVC) && (defined(_M_X64) || _M_IX86_FP >= 2)
// MSVC doesn't define __SSE2__, so do it ourselves
# define __SSE__ 1