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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.
*****************************************************************************/
/*
* 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"

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.
*****************************************************************************/
/*
* 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"