Author: kib
Date: Sat Jun 24 13:53:47 2017
New Revision: 320309
URL: https://svnweb.freebsd.org/changeset/base/320309
Log:
MFC r320051:
Correct translations between abridged and full x87 tags.
Approved by: re (marius)
Modified:
stable/11/sys/i386/isa/npx.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/i386/isa/npx.c
==============================================================================
--- stable/11/sys/i386/isa/npx.c Sat Jun 24 11:38:31 2017
(r320308)
+++ stable/11/sys/i386/isa/npx.c Sat Jun 24 13:53:47 2017
(r320309)
@@ -1116,7 +1116,7 @@ npx_fill_fpregs_xmm1(struct savexmm *sv_xmm, struct sa
sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
if ((penv_xmm->en_tw & (1 << i)) != 0)
/* zero and special are set as valid */
- penv_87->en_tw &= ~(3 << i);
+ penv_87->en_tw &= ~(3 << i * 2);
}
}
@@ -1147,11 +1147,16 @@ npx_set_fpregs_xmm(struct save87 *sv_87, struct savexm
penv_xmm->en_foo = penv_87->en_foo;
penv_xmm->en_fos = penv_87->en_fos;
- /* FPU registers and tags */
+ /*
+ * FPU registers and tags.
+ * Abridged / Full translation (values in binary), see FXSAVE spec.
+ * 0 11
+ * 1 00, 01, 10
+ */
penv_xmm->en_tw = 0;
for (i = 0; i < 8; ++i) {
sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
- if ((penv_87->en_tw && (3 << i)) != (3 << i))
+ if ((penv_87->en_tw & (3 << i * 2)) != (3 << i * 2))
penv_xmm->en_tw |= 1 << i;
}
}
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