PM0214 datasheet(99/245 Pages) STMICROELECTRONICS

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PM0214

The STM32 Cortex-M4 instruction set

244

3.5.16

UADD16 and UADD8

Unsigned add 16 and Unsigned add 8

Syntax

op{cond}{Rd,} Rn, Rm

where:

•

op is one of:

UADD16: Performs two 16-bit unsigned integer additions.

UADD8: Performs four 8-bit unsigned integer additions.

•

‘cond’ is an optional condition code (see Conditional execution on page 64)

•

‘Rd’ is the destination register

•

‘Rn’ is the first register holding the operand

•

‘Rm’ is the second register holding the operand

Operation

Use these instructions to add 16- and 8-bit unsigned data:

The UADD16 instruction:

Adds each halfword from the first operand to the corresponding halfword of the second

operand.

Writes the unsigned result in the corresponding halfwords of the destination register.

The UADD16 instruction:

Adds each byte of the first operand to the corresponding byte of the second operand.

Writes the unsigned result in the corresponding byte of the destination register.

Restrictions

Do not use SP and do not use PC.

Condition flags

These instructions do not change the flags.

Examples

UADD16 R1, R0

; Adds halfwords in R0 to corresponding halfword of R1,

; writes to corresponding halfword of R1

UADD8

R4, R0, R5

; Adds bytes of R0 to corresponding byte in R5 and writes

; to corresponding byte in R4.

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