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[Bug inline-asm/37621] Missing documentation for x86 inline assembler modifiers
- From: "dlenski at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 24 Sep 2008 17:43:05 -0000
- Subject: [Bug inline-asm/37621] Missing documentation for x86 inline assembler modifiers
- References: <bug-37621-16098@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from dlenski at gmail dot com 2008-09-24 17:43 -------
Hi Andrew,
It seems to me that these modifiers are quite necessary for flexible x86
assembly. What is the point of the "q" and "Q" constraints if there's no way
to specifically refer to the 16-bit or 8-bit components of the selected
register?
And are you sure there built-in functions to invoke the rol/ror/xhcg
instructions? I don't see any in the 4.3 docs.
Dan
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37621