Movzx 64 bits

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Roman

Joined: 21 Apr 2012
Posts: 1853

Roman 26 Nov 2022, 08:09

I want do movzx r8, [ppp]
Ppp dd 2.0

Like as convert float to double in register r8

26 Nov 2022, 08:09

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20461
Location: In your JS exploiting you and your system

revolution 26 Nov 2022, 08:18

Use the FPU or SSE.

Code:

fld [Ppp]
fstp [temp]
mov r8,[temp]
;...
temp dq ?

26 Nov 2022, 08:18

Roman

Joined: 21 Apr 2012
Posts: 1853

Roman 26 Nov 2022, 08:24

revolution wrote:

Use the FPU or SSE.

Code:

fld [Ppp]
fstp [temp]
mov r8,[temp]
;...
temp dq ?

Now I do this.
But thinked not using fpu and temp.
And thinked exist command like as movzx for 64 bits
I am using Sse cvtss2sd

26 Nov 2022, 08:24

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20461
Location: In your JS exploiting you and your system

revolution 26 Nov 2022, 08:30

R8 is primarily an integer register. You can store float values in it, but you can't do float operations inside r8.

Use SSE with xmm registers for float operations.

26 Nov 2022, 08:30

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