PM0214 datasheet(123/245 Pages) STMICROELECTRONICS

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PM0214

The STM32 Cortex-M4 instruction set

244

Examples

UMULL

R0, R4, R5, R6

; Unsigned (R4,R0) = R5 x R6

SMLAL

R4, R5, R3, R8

; Signed (R5,R4) = (R5,R4) + R3 x R8

3.6.12

SDIV and UDIV

Signed divide and unsigned divide.

Syntax

SDIV{cond} {Rd,} Rn, Rm

UDIV{cond} {Rd,} Rn, Rm

where:

•

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

•

‘Rd’ is the destination register. If Rd is omitted, the destination register is Rn

•

‘Rn,’ is the register holding the value to be divided

•

‘Rm’ is a register holding the divisor

Operation

SDIV performs a signed integer division of the value in Rn by the value in Rm.

UDIV performs an unsigned integer division of the value in Rn by the value in Rm.

For both instructions, if the value in Rn is not divisible by the value in Rm, the result is

rounded towards zero.

Restrictions

Do not use either SP or PC.

Condition flags

These instructions do not change the flags.

Examples

SDIV R0, R2, R4; signed divide, R0 = R2/R4

UDIV R8, R8, R1; unsigned divide, R8 = R8/R1

PM0214 数据表(PDF) 123 Page - STMicroelectronics

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