The following can be specified for imm:
The assembler does not check whether the value of the expression exceeds 16 bits. The generated mulh instruction performs the operation by using the lower 16 bits. |
Multiplies the value of the lower halfword data of the register specified by the first operand by the value of the lower halfword data of the register specified by the second operand as a signed value, and stores the result in the register specified by the second operand.
Multiplies the value of the lower halfword data of the absolute expression or relative expression specified by the first operand by the value of the lower halfword data of the register specified by the second operand as a signed value, and stores the result in the register specified by the second operand.
If the instruction is executed in syntax "mulh reg1, reg2", the assembler generates one mulh machine instruction. |
If the following is specified as imm in syntax "mulh imm, reg2", the assembler generates one mulh machine instructionNote. |
The mulh machine instruction takes a register or immediate value in the range of -16 to +15 (0xFFFFFFF0 to 0xF) as the first operand. |
If the following is specified for imm in syntax "mulh imm, reg2", the assembler executes instruction expansion to generate one or more machine instructions. |
Absolute expression exceeding the range of -16 to +15, but within the range of -32,768 to +32,767 |
If all the lower 16 bits of the value of imm are 0
Relative expression having !label or %label, or that having $label for a label with a definition in the sdata/sbss-attribute section |
mulh !label, reg |
mulhi !label, reg, reg |
mulh %label, reg |
mulhi %label, reg, reg |
mulh $label, reg |
mulhi $label, reg, reg |
Relative expression having #label or label, or that having $label for a label having no definition in the sdata/sbss-attribute section |
mulh #label, reg |
mov #label, r1 mulh r1, reg |
mulh label, reg |
mov label, r1 mulh r1, reg |
mulh $label, reg |
mov $label, r1 mulh r1, reg |
If r0 is specified by the second operand, the assembler outputs the following message and stops assembling. |