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Merge pull request #3799 from bartoldeman/cscal-zscal-no-fma 

x86_64: prevent GCC and Clang from generating FMAs in cscal/zscal.
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Martin Kroeker 2022-10-30 18:56:10 +01:00 committed by GitHub
parent 03bd1157d8 e7e3aa2948
commit 65338a9493
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2 changed files with 26 additions and 0 deletions
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13
kernel/x86_64/cscal.c
View File

@ -25,6 +25,19 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/ *****************************************************************************/
/*
* Avoid contraction of floating point operations, specifically fused
* multiply-add, because they can cause unexpected results in complex
* multiplication.
*/
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC optimize ("fp-contract=off")
#endif
#if defined(__clang__)
#pragma clang fp contract(off)
#endif
#include "common.h" #include "common.h"

13
kernel/x86_64/zscal.c
View File

@ -25,6 +25,19 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/ *****************************************************************************/
/*
* Avoid contraction of floating point operations, specifically fused
* multiply-add, because they can cause unexpected results in complex
* multiplication.
*/
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC optimize ("fp-contract=off")
#endif
#if defined(__clang__)
#pragma clang fp contract(off)
#endif
#include "common.h" #include "common.h"