==== 7.5.61 ishl ====

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.