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target/i386: fix fscale handling of signaling NaN

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The implementation of the fscale instruction returns a NaN exponent
unchanged. Fix it to return a quiet NaN when the provided exponent is
a signaling NaN.

Backports commit 0d48b436327955c69e2eb53f88aba9aa1e0dbaa0 from qemu
This commit is contained in:
Joseph Myers 2020-06-15 13:03:14 -04:00 committed by Lioncash
parent 18fc17ca25
commit d96c218664
1 changed files with 4 additions and 0 deletions
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4
qemu/target/i386/fpu_helper.c
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@ -936,6 +936,10 @@ void helper_fscale(CPUX86State *env)
{
if (floatx80_is_any_nan(ST1)) {
ST0 = ST1;
if (floatx80_is_signaling_nan(ST0, &env->fp_status)) {
float_raise(float_flag_invalid, &env->fp_status);
ST0 = floatx80_silence_nan(ST0, &env->fp_status);
}
} else {
int n = floatx80_to_int32_round_to_zero(ST1, &env->fp_status);
ST0 = floatx80_scalbn(ST0, n, &env->fp_status);