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> Main > Cmovnz what a f ? |
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Roman 19 Jan 2024, 12:36
I read nice asm command. I test this and thinking do assert without jnz.
Code: mov ebx,11 xor eax,eax test eax,eax ;zf = 1 cmovnz eax,ebx ; eax = 0 I am happy, work. Now i am write code for assert and ... Code: xor eax,eax test eax,eax ;zf = 1 cmovnz eax,[eаx] ;Get crash ! What a f..k ? And not exist cmovnz [eax],register https://www.youtube.com/watch?v=emiNHDgFUC4&t=2s Last edited by Roman on 19 Jan 2024, 13:19; edited 2 times in total |
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19 Jan 2024, 12:36 |
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macomics 19 Jan 2024, 12:47
ne/nz = (zf=0)
Code: mov ebx,11 xor eax,eax cmp eax,1 ;zf = 0 cmovnz eax,ebx ; eax = ebx |
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19 Jan 2024, 12:47 |
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revolution 19 Jan 2024, 13:33
If we look at the pseudo-code for the operation (from the x86 manual) we see this:
Code: temp := SRC IF condition TRUE THEN DEST := temp; ELSE IF (OperandSize = 32 and IA-32e mode active) THEN DEST[63:32] := 0; FI; |
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19 Jan 2024, 13:33 |
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Roman 19 Jan 2024, 13:44
Its bad news.
Intel planned implement in avx10 instruction test memory. |
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19 Jan 2024, 13:44 |
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