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Description. Computes the arctangent of the source operand in register ST(1) divided by the source operand in register ST(0), stores the result in ST(1), and pops the FPU register stack. The result in register ST(0) has the same sign as the source operand ST(1) and a magnitude less than +infinite. The FPATAN instruction
Trigonometric instructions. The FPU instructions covered in this chapter perform trigonometric operations with the value in the TOP data register ST(0), or with both ST(0) and ST(1). The trigonometric instructions covered in this document are (in alphabetical order): FCOS COSine of the angle value in ST(0) FPATAN Partial
Transcendental Instructions. Partial Tangent (fptan). fptan. Example. Replace stack element 0 with its tangent and push a value of 1 onto the FPU stack. fptan. Partial Arctangent (fpatan). fpatan. Example. Divide stack element 1 by stack element 0, compute the arctangent and return the result in radians to stack element 1,
The FPATAN instruction returns the angle between the X axis and the line from the origin to the point (X,Y), where Y (the ordinate) is ST(1) and X (the abscissa) is ST(0). The angle depends on the sign of X and Y independently, not just on the sign of the ratio Y/X. This is because a point (-X,Y) is in the second quadrant,
Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Transcendental Instructions > Partial Arctangent (fpatan). IA-32 Assembly Language Reference Manual. Previous: Partial Tangent (fptan) · Next: 2x - 1 (f2xm1)
2 1 The x86 architecture instructions look for the Intel Architecture Software Developer 39 s Manual fpatan computes the arctangent of the value in ST1. lab1 Purdue CS 354 Spring 2013 CS 354 Spring The FPATAN instruction Table 8 10 in the Intel® 64 , IA 32 Architectures Software Developer s Manual The source
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