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-rw-r--r--subx/opcodes1
1 files changed, 1 insertions, 0 deletions
diff --git a/subx/opcodes b/subx/opcodes
index 2a11df2b..098435d0 100644
--- a/subx/opcodes
+++ b/subx/opcodes
@@ -64,6 +64,7 @@ Opcodes currently supported by SubX:
   8b: copy rm32 to r32 (mov)
   8d: copy address in rm32 into r32 (lea)
   8f: pop top of stack to rm32 (pop)
+  99: sign-extend EAX into EDX (cdq)
   b8: copy imm32 to EAX (mov)
   b9: copy imm32 to ECX (mov)
   ba: copy imm32 to EDX (mov)