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.