diff options
| -rw-r--r-- | pkg/sentry/time/muldiv_arm64.s | 3 | ||||
| -rw-r--r-- | pkg/sentry/time/parameters_test.go | 15 |
2 files changed, 18 insertions, 0 deletions
diff --git a/pkg/sentry/time/muldiv_arm64.s b/pkg/sentry/time/muldiv_arm64.s index 5ad57a8a3..8afc62d53 100644 --- a/pkg/sentry/time/muldiv_arm64.s +++ b/pkg/sentry/time/muldiv_arm64.s @@ -12,12 +12,15 @@ // See the License for the specific language governing permissions and // limitations under the License. +#include "funcdata.h" #include "textflag.h" // Documentation is available in parameters.go. // // func muldiv64(value, multiplier, divisor uint64) (uint64, bool) TEXT ·muldiv64(SB),NOSPLIT,$40-33 + GO_ARGS + NO_LOCAL_POINTERS MOVD value+0(FP), R0 MOVD multiplier+8(FP), R1 MOVD divisor+16(FP), R2 diff --git a/pkg/sentry/time/parameters_test.go b/pkg/sentry/time/parameters_test.go index e1b9084ac..0ce1257f6 100644 --- a/pkg/sentry/time/parameters_test.go +++ b/pkg/sentry/time/parameters_test.go @@ -484,3 +484,18 @@ func TestMulDivOverflow(t *testing.T) { }) } } + +func BenchmarkMuldiv64(b *testing.B) { + var v uint64 = math.MaxUint64 + for i := uint64(1); i <= 1000000; i++ { + mult := uint64(1000000000) + div := i * mult + res, ok := muldiv64(v, mult, div) + if !ok { + b.Errorf("Result of %v * %v / %v ok got false want true", v, mult, div) + } + if want := v / i; res != want { + b.Errorf("Bad result of %v * %v / %v: got %v, want %v", v, mult, div, res, want) + } + } +} |