From: Shehryar Humayun <shehryarhumayunkhan@yahoo.com>
To: cgen@sources.redhat.com
Subject: Difference in Opcodes
Date: Sun, 22 Sep 2002 10:38:00 -0000 [thread overview]
Message-ID: <20020922173804.6503.qmail@web21201.mail.yahoo.com> (raw)
Hi,
Why is it that the opcodes generated by CGEN in
arm-opc.c and the opcodes written in tc-arm.c for the
same insn different. e.g.
in tc-arm.c, the opcode for instruction
add $rd,$rs,$rn
is "0x0000" and in arm-opc.c (the one generated by
CGEN), the value is "0x1800".
Can any one tell me how are the opcode values
generated by CGEN? Moreover, how can the two values
produce the same results? Thirdly, how is the
semantics field in define-normal-insn interperated and
where is it output?
Regards
Shehryar
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reply other threads:[~2002-09-22 17:38 UTC|newest]
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