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-rw-r--r--include/opcode/i386.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/opcode/i386.h b/include/opcode/i386.h
index 4311cd640..d60db76b7 100644
--- a/include/opcode/i386.h
+++ b/include/opcode/i386.h
@@ -59,6 +59,11 @@
/* The opcode for the fwait instruction, which disassembler treats as a
prefix when it can. */
#define FWAIT_OPCODE 0x9b
+
+/* Instruction prefixes.
+ NOTE: For certain SSE* instructions, 0x66,0xf2,0xf3 are treated as
+ part of the opcode. Other prefixes may still appear between them
+ and the 0x0f part of the opcode. */
#define ADDR_PREFIX_OPCODE 0x67
#define DATA_PREFIX_OPCODE 0x66
#define LOCK_PREFIX_OPCODE 0xf0