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target/i386: check for empty register in FXAM

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The fxam instruction returns the wrong result after fdecstp or after
an underflow. Check fptags to handle this.

Backports commit 93c3593ad04f2610fd0a176dfa89a7e40b6afe1f from qemu
This commit is contained in:
Paolo Bonzini 2020-03-21 19:43:18 -04:00 committed by Lioncash
parent 7c799d29db
commit 583cc7b8b1
1 changed files with 5 additions and 1 deletions
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6
qemu/target/i386/fpu_helper.c
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@ -957,7 +957,11 @@ void helper_fxam_ST0(CPUX86State *env)
env->fpus |= 0x200; /* C1 <-- 1 */
}
/* XXX: test fptags too */
if (env->fptags[env->fpstt]) {
env->fpus |= 0x4100; /* Empty */
return;
}
expdif = EXPD(temp);
if (expdif == MAXEXPD) {
if (MANTD(temp) == 0x8000000000000000ULL) {