Java Virtual Machine (Java Series)

dconst_<d>

dconst_0 or dconst_1

Stack

dconst_<d> pushes the constant double precision floating point number <d> onto the stack, where <d> is either 0 or 1. For example, to push the double precision float 0.0 onto the stack, use:

dconst_0 ; push the double 0.0 onto the stack Note that you could also use:

ldc2_w 0.0 ; push the double 0.0 onto the stack although this instruction takes more space in the class file and is typically less efficient.

Example

dconst_0 ; push the double 0.0 onto the stack dconst_1 ; push the double 1.0 onto the stack Bytecode

bipush, sipush, ldc, ldc_w, ldc2_w, aconst_null, iconst_m1, iconst_<n>, lconst_<l>, fconst_<f>,

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