Shift left int

Format

ishl

Forms

ishl = 78 (0x4e)

Stack

…, value1.word1, value1.word2, value2.word1, value2.word2 → …, result.word1, result.word2

Description

Both value1 and value2 must be of type int. The values are popped from the operand stack. An int result is calculated by shifting value1 left by s bit positions, where s is the value of the low five bits of value2. The result is pushed onto the operand stack.

Notes

This is equivalent (even if overflow occurs) to multiplication by 2 to the power s. The shift distance actually used is always in the range 0 to 31, inclusive, as if value2 were subjected to a bitwise logical AND with the mask value 0x1f.

If a virtual machine does not support the int data type, the ishl instruction will not be available.