https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102266
Bug ID: 102266
Summary: RFE: x86: print operand with optional (%rip) suffix
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: hpa at zytor dot com
Target Milestone: ---
Target: x86
In the Linux kernel we reasonably frequently use extended asm operand modifiers
like %P[]/%p[] for encoding a memory operand that *must not* use
register-indirect forms. On x86-64, they can sometimes be encoded as
%rip-relative, however, there is currently no convenient way for doing so
without also making the assembly code x86-64 specific whereas it otherwise
would be perfectly fine dual mode.
I would therefore like to request one of the following, in order of preference:
1. A modifier to emit a memory immediate operand (i.e. a constant sans $) with
a (%rip) suffix assuming it can be so encoded.
2. A simple macro (like %=) that emits (%rip) on x86-64 but nothing on i386.
The priority of this is quite low, but it is probably simple to implement.
