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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: Ildar Isaev <ild@inbox.ru>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Ildar Isaev 2015-02-05 13:37:25 +00:00 committed by Peter Maydell
parent 84f2bed3cf
commit fc1792e9aa
1 changed files with 1 additions and 1 deletions
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target-arm/helper.c
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@ -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));
}