From:	"Heo, Sung-Gwan" <heo AT turbotek DOT co DOT kr>
Newsgroups:	comp.os.msdos.djgpp
Subject:	i386 as assembler manual and fsubrp instruncion in as.
Date:	Mon, 10 Nov 1997 15:56:13 +0900
Organization:	S/W Team, Turbo Tek
Lines:	62
Message-ID:	<3466B00B.5F48AE7@turbotek.co.kr>
Reply-To:	heo AT turbotek DOT co DOT kr
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To:	djgpp AT delorie DOT com
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Hi, there!

While I wrote my math lib with Borland tasm assembler refering to djgpp
math lib source,
I found that the 'FSUBRP' instruction in as assembler is 'FSUBP' in tasm
assembler, not 'FSUBRP'.

In as assembler
    'FSUBRP    %st, %st(1)'   is assembled into opcode  'DE E9'
and in tasm assember
    'FSUBP    st(1), st'   is also assembled into opcode  'DE E9'.

In Intel Pentium Developer's Manual, opcode 'DE E9' corresponds to
instruction
    'FSUBP' or 'FSUBP st(1), st'.

Why does the as assembler use 'FSUBRP' mnemonic for opcode 'DE E9' which
works really as 'FSUBP' instruction? And Where can I get the as
assembler manual concerning the instructions?

Thanks in advance.

--
Heo, Sung-Gwan.
heo AT turbotek DOT co DOT kr








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