PM0214 datasheet(132/245 Pages) STMICROELECTRONICS

132 / 245 page

The STM32 Cortex-M4 instruction set

PM0214

132/245

DocID022708 Rev 4

These instructions do not affect the condition code flags.

Examples

UQADD16 R7, R4, R2; Adds halfwords in R4 to corresponding halfword in R2,

; saturates to 16 bits, writes to corresponding halfword

; of R7

UQADD8

R4, R2, R5 ; Adds bytes of R2 to corresponding byte of R5, saturates

; to 8 bits, writes to corresponding bytes of R4

UQSUB16 R6, R3, R0 ; Subtracts halfwords in R0 from corresponding halfword

; in R3, saturates to 16 bits, writes to corresponding

; halfword in R6

UQSUB8

R1, R5, R6 ; Subtracts bytes in R6 from corresponding byte of R5,

; saturates to 8 bits, writes to corresponding byte of

R1.

3.8

Packing and unpacking instructions

Table 31 shows the instructions that operate on packing and unpacking data:

Table 31. Packing and unpacking instructions

Mnemonic

Brief description

See

PKH

Pack Halfword

PKHBT and PKHTB on page 133

SXTAB

Extend 8 bits to 32 and add

SXTA and UXTA on page 135

SXTAB16

Dual extend 8 bits to 16 and add

SXTA and UXTA on page 135

SXTAH

Extend 16 bits to 32 and add

SXTA and UXTA on page 135

SXTB

Sign extend a byte

SXT and UXT on page 134

SXTB16

Dual extend 8 bits to 16 and add

SXT and UXT on page 134

SXTH

Sign extend a halfword

SXT and UXT on page 134

UXTAB

Extend 8 bits to 32 and add

SXTA and UXTA on page 135

UXTAB16

Dual extend 8 bits to 16 and add

SXTA and UXTA on page 135

UXTAH

Extend 16 bits to 32 and add

SXTA and UXTA on page 135

UXTB

Zero extend a byte

SXT and UXT on page 134

UXTB16

Dual zero extend 8 bits to 16 and add

SXT and UXT on page 134

UXTH

Zero extend a halfword

SXT and UXT on page 134

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