https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92218
Bug ID: 92218
Summary: PowerPC indexed insn attribute misses some insns
(bswap, atomic, small int float memory)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: meissner at gcc dot gnu.org
Target Milestone: ---
In working on the PowerPC 'future' processor, I was using the 'indexed' insn
attribute to know when a certain insn used indexed addressing instead of offset
addressing.
However it fails in one crucial case. If the address is a single register
(i.e. indirect addressing) and the insn form requires indexed addressing, the
indexed_address_mem predicate function will fail.
Off the top of my head, the places where this happens is:
1) Load/store of 8/16/32-bit integers to/from vector/FPR registers;
2) Byte swap to/from memory; or
3) Atomic memory operations.
The simplest approach is to go into each of the problematical insns, and
explicitly set 'indexed' to 'yes' for the alternatives that require indexed
addressing.
