fsin

Sine

FSIN

Computes sine of ST(0) (in radians).

Pseudocode Operation

ST(0) ← sin(ST(0))

Encoding

Binary Layout
D9
+0
FE
+1
 
Format Legacy
Opcode D9 FE
Extension x87 FPU

Operands

Related

More in x87 FPU

Reference

View in Intel® 64 and IA-32 Architectures SDM ↗ Intel® SDM

Instruction Forms

Opcode Instruction Op/En 64/32-bit Mode CPUID Description
D9 FE FSIN Valid Valid Replace ST(0) with the approximate of its sine.

Description

Computes an approximation of the sine of the source operand in register ST(0) and stores the result in ST(0). The source operand must be given in radians and must be within the range -263 to +263. The following table shows the results obtained when taking the sine of various classes of numbers, assuming that underflow does not occur. Table 3-37. FSIN Results SRC (ST(0)) DEST (ST(0)) - ∞ *

- F - 1 to + 1

- 0 -0

+ 0                                                 + 0
+ F                                               - 1 to +1

+ ∞ * NaN NaN

Operation

IF -263 < ST(0) < 263
THEN
C2 := 0;
ST(0) := fsin(ST(0)); // approximation of the mathematical sin function
ELSE (* Source operand out of range *)
C2 := 1;
FI;

Exceptions

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. FSIN-Sine Vol. 2A 3-381