Exponentiation in Fasm X64 Windows

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Aditya J

Joined: 17 Feb 2024
Posts: 6
Location: home

Aditya J 11 May 2024, 07:44

How can i do float exponentiation in windows fasm?

I want to exponentiate XMM registers...

Tried F2XM1 but it is working for x86 not x64
Also another method was to use LN and EXP but unsure how to do that
Can i use the powf in the C standard library???

Plz help...

11 May 2024, 07:44

bitRAKE

Joined: 21 Jul 2003
Posts: 4020
Location: vpcmpistri

bitRAKE 11 May 2024, 12:04

The FPU instructions work in 64-bit.

Alternately, you'll need to code SSE functions for e^x and log b; or use a library of math functions.

Another option is OleAut32.VarPow or OleAut32.VarR8Pow.

Code:

        vmovq xmm0, [d2.0]
        vmovq xmm1, [d3.0]
        lea r8, [result]
        call [VarR8Pow]

d2.0    dq 2.0
d3.0    dq 3.0
result  dq ?

... lazy mode. Smile

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11 May 2024, 12:04

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