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Vol. 2A 3-313
INSTRUCTION SET REFERENCE, A-M
FCOS—Cosine
ST(0) ← cosine(ST(0));
ELSE (* Source operand is out-of-range *)
C2 ← 1;
FI;
FPU Flags Affected
C1 Set to 0 if stack underflow occurred.
Set if result was rounded up; cleared otherwise.
Undefined if C2 is 1.
C2 Set to 1 if outside range (−2
63
< source operand < +2
63
); other-
wise, set to 0.
C0, C3 Undefined.
Floating-Point Exceptions
#IS Stack underflow occurred.
#IA Source operand is an SNaN value, ∞, or unsupported format.
#D Source is a denormal value.
#P Value cannot be represented exactly in destination format.
Protected Mode Exceptions
#NM CR0.EM[bit 2] or CR0.TS[bit 3] = 1.
#MF If there is a pending x87 FPU exception.
#UD If the LOCK prefix is used.
Real-Address Mode Exceptions
Same exceptions as in protected mode.
Virtual-8086 Mode Exceptions
Same exceptions as in protected mode.
Compatibility Mode Exceptions
Same exceptions as in protected mode.
64-Bit Mode Exceptions
Same exceptions as in protected mode.