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Asked: 2026-05-16T14:27:25+00:00

How do I go about Power and Square root functions in Assembly Language (with/out)

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How do I go about Power and Square root functions in
Assembly Language (with/out) Stack on Linux.

Edit 1 : I’m programming for Intel x_86.

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  1. Editorial Team

    In x86 assembly, there is no instruction for a Power operation, but you can build your own routine for calculating Power() by expressing the Power in terms of logarithms.

    The following two instructions calculate logarithms:

    FYL2X   ; Replace ST(1) with (ST(1) * log2 ST(0)) and pop the register stack.
FYL2XP1 ; Replace ST(1) with (ST(1) * log2(ST(0) + 1.0)) and pop the register stack.

    There are several ways to compute the square root:

    (1) You can use the FPU instruction

    FSQRT ; Computes square root of ST(0) and stores the result in ST(0).

    (2) alternatively, you can use the following SSE/SSE2 instructions:

    SQRTPD xmm1, xmm2/m128 ;Compute Square Roots of Packed Double-Precision Floating-Point Values
SQRTPS xmm1, xmm2/m128 ;Compute Square Roots of Packed Single-Precision Floating-Point Values
SQRTSS xmm1, xmm2/m128 ;Compute Square Root of Scalar Single-Precision Floating-Point Value
SQRTSD xmm1, xmm2/m128 ;Compute Square Root of Scalar Double-Precision Floating-Point Value
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