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Index > Compiler Internals > fasm is hanging

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CandyMan



Joined: 04 Sep 2009
Posts: 311
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
CandyMan
Code:
use16
vpgatherdd xmm0{k1},dword [rax+xmm0+0x40]        ;hanging
    

Code:
use64
vpgatherdd xmm0{k1},dword [eax+xmm1+0x40]       ;disallowed combination of registers
    

Code:
vcvtsi2sd xmm31,xmm2,dword [rsp+64]     ;needed disp8=10h
vcvtusi2sd xmm1,xmm2,dword [rax+64]     ;needed disp8=10h
    

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Post 27 Oct 2015, 08:29
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7724
Location: Kraków, Poland
Tomasz Grysztar
CandyMan wrote:
Code:
use64
vpgatherdd xmm0{k1},dword [eax+xmm1+0x40]       ;disallowed combination of registers
    
Can you give more detail on this one? I was not able to reproduce the error.
Post 27 Oct 2015, 12:03
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CandyMan



Joined: 04 Sep 2009
Posts: 311
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
CandyMan
Code:
use16
vpgatherdd xmm0{k1},[rax+xmm0+64]
    


Code:
      check_vsib:
        xor     ah,ah
      check_vsib_base:                         ;*
        test    bh,bh
        jz      check_vsib_index
        mov     al,bh
        shr     al,4
        cmp     al,4
        je      check_vsib_base_size 
        cmp     [code_type],64
        jne     swap_vsib_registers           ;*
        cmp     al,8
        jne     swap_vsib_registers
      check_vsib_base_size:
        mov     ah,[address_size]
        and     ah,0Fh
        jz      check_vsib_index
        cmp     al,ah
        jne     invalid_address
      check_vsib_index:
        mov     al,bl
        and     al,0E0h
        cmp     al,0C0h
        jae     check_index_scale
        cmp     al,60h
        je      check_index_scale
        jmp     invalid_address
      swap_vsib_registers:
        xor     al,-1
        jz      invalid_address
        cmp     cl,1
        ja      invalid_address
        xchg    bl,bh
        mov     cl,1
        jmp     check_vsib_base       ;* closed loop
    

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Post 27 Oct 2015, 13:10
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7724
Location: Kraków, Poland
Tomasz Grysztar
No, I meant the second one of your samples. The first one is already fixed.
Post 27 Oct 2015, 13:13
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CandyMan



Joined: 04 Sep 2009
Posts: 311
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
CandyMan
Whether you could what combinations of registers are disallowed?
thanks...

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Post 27 Oct 2015, 13:46
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7724
Location: Kraków, Poland
Tomasz Grysztar
The disallowed combinations are defined in Intel manuals this way:
Intel wrote:
The instruction will #UD fault if the destination vector zmm1 is the same as index vector VINDEX.
Therefore the error message is caused by this instruction:
Code:
vpgatherdd xmm0{k1},dword [eax+xmm0+0x40] ; error: disallowed combination of registers    
but it should not be caused by the instruction you've shown. If you encountered a case when it signals that error, please show the entire [minimal] source that causes the problem.
Post 27 Oct 2015, 14:12
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