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cancandodo
Advanced Cheater
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Joined: 09 Mar 2012
Posts: 70
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 Posted: Sun Sep 28, 2025 10:37 pm Post subject: how to compare xmm0(double)>0 or <0 then jmp |
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alloc(testpoint,10)
testpoint:
registerSymbol(testpoint)
db 0 0 0 0 0 0 0 0
=============
comisd xmm0,[testpoint]
jg code
can not work
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ParkourPenguin
I post too much
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Joined: 06 Jul 2014
Posts: 4702
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| Posted: Mon Sep 29, 2025 10:36 am Post subject: |
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Instead of `jg` (jump if greater) use `je` (jump if equal) or `jne` (jump if not equal). If the value is not equal to 0, then it's either greater than 0 or less than 0.
Also instead of `db 0 0 0 0 0 0 0 0` use `dq (double)0`. This is the same thing, but it's easier to read.
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I don't know where I'm going, but I'll figure it out when I get there. |
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Csimbi
I post too much
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Joined: 14 Jul 2007
Posts: 3324
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| Posted: Tue Sep 30, 2025 12:27 pm Post subject: |
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Intel manual:
| Quote: | COMISD (All Versions)
RESULT := OrderedCompare(DEST[63:0] <> SRC[63:0]) {
(* Set EFLAGS *) CASE (RESULT) OF
UNORDERED: ZF,PF,CF := 111;
GREATER_THAN: ZF,PF,CF := 000;
LESS_THAN: ZF,PF,CF := 001;
EQUAL: ZF,PF,CF := 100;
ESAC;
OF, AF, SF := 0; } |
I.e.
| Code: | UNORDERED: ZF,PF,CF 111; jz/jp/jc
EQUAL: ZF,PF,CF 100; jz - covers UNORDERED, too.
LESS_THAN: ZF,PF,CF 001; jc - covers UNORDERED, too.
GREATER_THAN: ZF,PF,CF 000; jnc - covers UNORDERED, too. |
So, instead of je, jg, use these.
You will always want to skip if parity, then you can use the others to do what you need to.
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