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Index > Windows > SSE Convert numbers to string.

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Roman



Joined: 21 Apr 2012
Posts: 815
Roman
I'm looking example how do this.

One FBSTP convert to BCD num , but take about 260 CPU tiks.
One Div instruction take about 50 CPU tiks.

SSE mulss take about 2 CPU tiks.
If use mulss on 0.1 we get divide on 10.
Post 28 Jul 2020, 11:57
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pabloreda



Joined: 24 Jan 2007
Posts: 104
Location: Argentina
pabloreda
Post 28 Jul 2020, 12:34
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7797
Location: Kraków, Poland
Tomasz Grysztar
I would recommend first checking out this old thread: Binary number to decimal ASCII string conversion.
Post 28 Jul 2020, 13:35
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Roman



Joined: 21 Apr 2012
Posts: 815
Roman
I try on 999998 and 9999997
9999998 get me text 9999999
Code:
         mov eax,999998; or 9999997
         cvtsi2ss xmm1,eax
         mov eax,0.1
         movd xmm0,eax
         mov eax,1.0
         movd xmm2,eax
         sub eax,eax
.22:     mulss xmm1,xmm0
         inc eax
         comiss xmm1,xmm2
         jae .22
         sub edx,edx
         mov ebx,10.0
         ;inc eax
         xorps xmm2,xmm2
         movd xmm0,ebx
         mov ebx,Status22
.33:
         cvtsi2ss xmm2,edx

         subss xmm1,xmm2
         mulss xmm1,xmm0
         ;cvtss2si edx,xmm1
         roundss xmm3,xmm1,9
         cvtss2si edx,xmm3
         mov [ebx],dl
         add byte [ebx],48
         inc ebx
         dec eax
         test eax,eax
         jnz .33
         invoke MessageBox,0,Status22,0,0
    
Post 28 Jul 2020, 15:03
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