Java Virtual Machine (Java Series)

fcmpl

fcmpl Stack

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

If the two numbers are the same, the 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, the integer -1 is pushed onto the stack. If either number is NaN, the integer 1 is pushed onto the stack. +0.0 and -0.0 are treated as equal.

Example

fload_1 ; push the float in local variable 1 fconst_0 ; push the float 0 onto the stack fcmpl ; 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

lcmp, fcmpg, dcmpl, dcmpg

Notes

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

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