I was working in an Embedded processor with GCC-4.6.4 version. I need to add load/store reverse instructions to the MD file. My instructions will look as below:
LWX Rd,Ra,Rb
operation: Addr := Ra + Rb
Rd := *Addr (loading data with the opposite endianness)
SWX Rd,Ra,Rb
operation: Addr := Ra + Rb
*Addr := Rd (storing data with the opposite endianness)
To add the above instructions in to md file I tried below pattern in md file
(define_insn "movsi_rev"
[(set (match_operand:SI 0 "nonimmediate_operand" "=d,m")
(bswap: SI (match_operand:SI 1 "move_src_operand" "m,d")))]
""
"@
lwxt%0,%1,%0
swxt%0,%1,%0"
[(set_attr "type" "load,store")
(set_attr "mode" "SI")
(set_attr "length" "4,4")])
I wrote a small testcase which is generating swx instruction but the operands are more due to which it is failing in assembler phase
ex: instead of swx r0,r2,r0 it is generating swx r0,r2,0,r0
can anyone please help me in removing the extra operand in the above instruction.