target/i386: check for empty register in FXAM
The fxam instruction returns the wrong result after fdecstp or after an underflow. Check fptags to handle this. Reported-by: <chengang@emindsoft.com.cn> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -991,7 +991,11 @@ void helper_fxam_ST0(CPUX86State *env)
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env->fpus |= 0x200; /* C1 <-- 1 */
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}
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/* XXX: test fptags too */
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if (env->fptags[env->fpstt]) {
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env->fpus |= 0x4100; /* Empty */
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return;
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}
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expdif = EXPD(temp);
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if (expdif == MAXEXPD) {
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if (MANTD(temp) == 0x8000000000000000ULL) {
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