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[Bug inline-asm/37621] Missing documentation for x86 inline assembler modifiers
- From: "n dot pipenbrinck at cubic dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 24 Sep 2008 22:41:38 -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 #3 from n dot pipenbrinck at cubic dot org 2008-09-24 22:41 -------
ROL/ROR on the native integer size is not supported via intrinsics, but the
compiler will fold two shifts into a rotate.
If I want to manipulate only the lower 16 bit of an 32 bit integer (e.g. issue
a rolw) assembly is the only way it's currently possible.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37621