http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52364
Bug #: 52364
Summary: The unnecessary second form in *movabs<mode>_[12]
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: hjl.to...@gmail.com
CC: hubi...@gcc.gnu.org, ubiz...@gmail.com
Target: x86_64
i386.md has
;; Stores and loads of ax to arbitrary constant address.
;; We fake an second form of instruction to force reload to load address
;; into register when rax is not available
(define_insn "*movabs<mode>_1"
[(set (mem:SWI1248x (match_operand:DI 0 "x86_64_movabs_operand" "i,r"))
(match_operand:SWI1248x 1 "nonmemory_operand" "a,er"))]
"TARGET_64BIT && ix86_check_movabs (insn, 0)"
"@
movabs{<imodesuffix>}\t{%1, %P0|%P0, %1}
mov{<imodesuffix>}\t{%1, %a0|%a0, %1}"
[(set_attr "type" "imov")
(set_attr "modrm" "0,*")
(set_attr "length_address" "8,0")
(set_attr "length_immediate" "0,*")
(set_attr "memory" "store")
(set_attr "mode" "<MODE>")])
Isn't the second form redundant since it is just normal mov<mode>?
