Commit fc1792e9 authored by Ildar Isaev's avatar Ildar Isaev Committed by Peter Maydell
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target-arm: fix for exponent comparison in recpe_f64 



f64 exponent in HELPER(recpe_f64) should be compared to 2045 rather than 1023
(FPRecipEstimate in ARMV8 spec). This fixes incorrect underflow handling when
flushing denormals to zero in the FRECPE instructions operating on 64-bit
values.

Signed-off-by: default avatarIldar Isaev <ild@inbox.ru>
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 84f2bed3

target-arm/helper.c

+1 −1
Original line number Diff line number Diff line
@@ -6526,7 +6526,7 @@ float64 HELPER(recpe_f64)(float64 input, void *fpstp) 
        } else {

            return float64_set_sign(float64_maxnorm, float64_is_neg(f64));

        }

    } else if (f64_exp >= 1023 && fpst->flush_to_zero) {

    } else if (f64_exp >= 2045 && fpst->flush_to_zero) {

        float_raise(float_flag_underflow, fpst);

        return float64_set_sign(float64_zero, float64_is_neg(f64));

    }