==== 7.5.100 sshl ====

Shift left short 

Format 

sshl 

Forms 

sshl = 77 (0x4d) 

Stack 

..., value1, value2 -> ..., result 

Description 

Both value1 and value2 must be of type short. The values are popped from the operand stack. A short 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. 

The mask value of 0x1f allows shifting beyond the range of a 16-bit short value. It is used by this instruction, however, to ensure results equal to those generated by the Java instruction ishl.