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Assembly constraints - offset?
- From: Avi Kivity <avi at qumranet dot com>
- To: gcc-help at gcc dot gnu dot org
- Date: Wed, 27 Sep 2006 13:42:57 +0300
- Subject: Assembly constraints - offset?
I'd like to access several members of a structure from inline assembly
(x86):
asm ( "mov $1, %[member1](%[base]) \n\t"
"mov $2, %[member2](%[base]) \n\t"
: : [base]"r"(ptr),
[member1]"i"(offsetof(struct the_struct, member1)),
[member2]"i"(offsetof(struct the_struct, member2)));
However, the "i" constraint generates an immediate marker ('$'), so I get
mov $1, $4(%ecx)
mov $2, $8(%ecx)
The second '$' is a bit unhelpful.
Is there any constraint which will emit the offset without the '$'?
Thanks in advance.
--
error compiling committee.c: too many arguments to function