PREFETCH.W

Prefetch Write

PREFETCH.W offset(rs1)

Hints to hardware to bring the cache block at the address into the data cache for writing (exclusive ownership).

Encoding

Binary Layout

imm12hi

31:25

00011

24:20

rs1

19:15

110000000010011

14:0

 

Format S-Type (Hint)

Opcode 0x00306013

Extension Zicbop

Operands

• rs1
  Base Address
• offset
  Offset

Example

PREFETCH.W 0(x10)

// Prepare D-Cache for writing.

Related

Across architectures

Cache Prefetch Hint : how x86, ARM, RISC-V, and PowerISA each do this.

More in Zicbop

Reference

View in RISC-V Unprivileged ISA Specification ↗ RISC-V ISA Manual

Description

PREFETCH.W is a hint to the memory system to prefetch the cache block at rs1+offset into the data cache for a write access.

Operation

Prefetch(D-Cache, Write, R[rs1] + offset);