57.

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dcmpl

compare two doubles (-1 on NaN)

Jasmin Syntax
     dcmpl 

Stack

Before

After
value1-word1
int-result
value1-word2
...
value2-word1

value2-word2

...

Description

This takes two double-precision floating point numbers off the operand stack and compares them, using IEEE 754 rules.

If the two numbers are the same, the 32-bit integer 0 is pushed onto the stack. If value2 is greater than value1, the integer 1 is pushed onto the stack. If value1 is greater than value2, -1 is pushed onto the stack. If either numbers is NaN, the integer 1 is pushed onto the stack. +0.0 and -0.0 are treated as equal.

Example

 dload_1       ; push the double in local variable 1 dconst_0      ; push the double 0.0 onto the stack dcmpl         ; compare the two numbers ; The integer result on the stack is: ;     0 if local variable 1 equals 0 ;     -1 if local variable 1 is less than 0 ;     1 if local variable 1 is greater than 0 
Bytecode

Type

Description
u1
dcmpl opcode = 0x97 (151)
See Also

lcmp, fcmpl, fcmpg, dcmpg

Notes

This instruction is identical to dcmpg except for the treatment of NaN.


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Java Virtual Machine, by Jon Meyer and Troy Downing, O'Reilly Associates


Java Virtual Machine
Java Virtual Machine (Java Series)
ISBN: 1565921941
EAN: 2147483647
Year: 1996
Pages: 171

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