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Wrong code generation.

I'm using the Keil C251 Compiler
Optimizing 80251 C Compiler
Version 1.x
(DLL 1.24)

The following instruction is in a function called after an SIO Interrupt:

byLength = abyRecBuf[0]

And the generated code is
7E7301D0 MOV R7,ABYRECBUF
7E004D MOV R0,#4D
A5A607 MOV @R0?#BOOTDOWN#Value

4D is byLength's memory address
and Value is a parameter from BootDown witch has nothing to do with the SIO interrupt.

Is it a compiler bug ????