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-rw-r--r--target/riscv/insn32.decode1
1 files changed, 1 insertions, 0 deletions
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index 282e41aa3e..73d5d1b045 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -134,6 +134,7 @@ addi     ............     ..... 000 ..... 0010011 @i
 slti     ............     ..... 010 ..... 0010011 @i
 sltiu    ............     ..... 011 ..... 0010011 @i
 xori     ............     ..... 100 ..... 0010011 @i
+# cbo.prefetch_{i,r,m} instructions are ori with rd=x0 and not decoded.
 ori      ............     ..... 110 ..... 0010011 @i
 andi     ............     ..... 111 ..... 0010011 @i
 slli     00000. ......    ..... 001 ..... 0010011 @sh