Multiply two 64-bit values together. Place the high-order 64 bits of the result into a register.
| PowerPC | |
|---|---|
| mulhd | RT, RA, RB (Rc=0) |
| mulhd. | RT, RA, RB (Rc=1) |
The 64-bit operands are the contents of general purpose registers (GPR) RA and RB. The high-order 64 bits of the 128-bit product of the operands are placed into RT.
Both the operands and the product are interpreted as signed integers.
This instruction may execute faster on some implementations if RB contains the operand having the smaller absolute value.
This instruction is defined only for 64-bit implementations. Using it on a 32-bit implementation will cause the system illegal instruction error handler to be invoked.