Assembler:Commands:COMISS - Revision history

Hanslhansl at 16:25, 25 March 2022

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Hanslhansl at 15:57, 25 March 2022

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Hanslhansl at 15:43, 25 March 2022

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Hanslhansl: Created page with "Category:Assembler '''command''' comiss ''operand1'', ''operand2'' Compares the single-precision floating-point (single-fp) value in the low doubleword of the first opera..."

2022-03-25T15:39:17Z

Created page with "Category:Assembler '''command''' comiss ''operand1'', ''operand2'' Compares the single-precision floating-point (single-fp) value in the low doubleword of the first opera..."

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[[Category:Assembler]]
'''command''' comiss ''operand1'', ''operand2''

Compares the single-precision floating-point (single-fp) value in the low doubleword of the first operand with the single-fp value in the low doubleword of the second operand and sets the status flags in the (E)FLAGS register.

The '''CF''', '''ZF''' and '''PF''' flags are set according to the result (unordered, greater than, less than, or equal).
The '''OF''', '''SF ''' and '''AF''' flags are set to 0.
The unordered result is returned if either source operand is a NaN (QNaN or SNaN).

=== Command Parameters ===
{|width="85%" cellpadding="10%" cellpadding="5%" cellspacing="0" border="0"
!align="left"|Parameter
!style="width: 80%;background-color:white;" align="left"|Description
|-
|operand1
|The first operand to compare. Must be a XMM register.
|-
|operand2
|The second operand to compare. May be an XMM register or a 32 bit memory location
|}

== Examples ==
comiss xmm2,xmm5

comiss xmm2,[eax]

comiss xmm0,[00123ABC]

{{AssemblerCommandSeeAlso}}

{{Template:AssemblerCommandExternalLinks}}

@@ Line 24: / Line 24: @@
 !align="left"|Parameters
 !style="width: 2%;background-color:white;" align="left"|ZF
-!style="width: 2%;background-color:white;" align="left"|CF
+!style="width: 2%;background-color:white;" align="left"|PF
 !style="width: 76%;background-color:white;" align="left"|CF
 |-

@@ Line 21: / Line 21: @@
 == Resulting Flag State ==
-{|width="85%" cellpadding="10%" cellpadding="5%" cellspacing="0" border="0"
+{|width="85%" cellpadding="5%" cellspacing="0" border="0"
 !align="left"|Parameters
 !style="width: 2%;background-color:white;" align="left"|ZF

@@ Line 24: / Line 24: @@
 {|width="85%" cellpadding="10%" cellpadding="5%" cellspacing="0" border="0"
 !align="left"|Parameters
-!style="width: 5%;background-color:white;" align="left"|ZF
+!style="width: 2%;background-color:white;" align="left"|ZF
-!style="width: 5%;background-color:white;" align="left"|CF
+!style="width: 2%;background-color:white;" align="left"|CF
-!style="width: 70%;background-color:white;" align="left"|CF
+!style="width: 76%;background-color:white;" align="left"|CF
 |-
 |operand1 < operand2

@@ Line 23: / Line 23: @@
 === Resulting Flag State ===
 {|width="85%" cellpadding="10%" cellpadding="5%" cellspacing="0" border="0"
 |-
 |operand1 < operand2
-|ZF = 0, PF = 0, CF = 1
+|0
 |-
 |operand1 = operand2
-|ZF = 1, PF = 0, CF = 0
+|1
 |-
 |operand1 > operand2
-|ZF = 0, PF = 0, CF = 0
+|0
 |-
 |unordered
-|ZF = 1, PF = 1, CF = 1
+|1
 |}

@@ Line 21: / Line 21: @@
 |}
-=== Result ===
+=== Resulting Flag State ===
 {|width="85%" cellpadding="10%" cellpadding="5%" cellspacing="0" border="0"
 |-
 |operand1 < operand2

@@ Line 6: / Line 6: @@
 The '''CF''', '''ZF''' and '''PF''' flags are set according to the result (unordered, greater than, less than, or equal).
 The '''OF''', '''SF ''' and '''AF''' flags are set to 0.
-=== Command Parameters ===
+== Command Parameters ==
 {|width="85%" cellpadding="10%" cellpadding="5%" cellspacing="0" border="0"
 !align="left"|Parameter
@@ Line 21: / Line 20: @@
 |}
-=== Resulting Flag State ===
+== Resulting Flag State ==
 {|width="85%" cellpadding="10%" cellpadding="5%" cellspacing="0" border="0"
 !align="left"|Parameters
@@ Line 48: / Line 47: @@
 |1
 |}
 == Examples ==

@@ Line 19: / Line 19: @@
 |operand2
 |The second operand to compare. May be an XMM register or a 32 bit memory location
 |}