[PATCH][rs6000] use index form addresses more often for l[wh]brx/st[wh]brx

[Aaron Sawdey]

This does the same thing for bswap<mode>2 that I previously did for bswapdi2.
The predicates for bswap<mode>2_{load,store} are now 
indexed_or_indirect_operand,
and bswap<mode>2 uses rs6000_force_indexed_or_indirect_mem to make sure the
address is appropriate for that predicate.

Bootstrap/regtest passes on ppc64le power8/power9, ok for trunk?

Thanks!
    Aaron



2018-11-05  Aaron Sawdey  <acsaw...@linux.ibm.com>

        * config/rs6000/rs6000.md (bswap<mode>2): Force address into register
        if not in indexed or indirect form.
        (bswap<mode>2_load): Change predicate to indexed_or_indirect_operand.
        (bswap<mode>2_store): Ditto.


Index: gcc/config/rs6000/rs6000.md
===================================================================
--- gcc/config/rs6000/rs6000.md (revision 265753)
+++ gcc/config/rs6000/rs6000.md (working copy)
@@ -2411,9 +2411,15 @@
     src = force_reg (<MODE>mode, src);

   if (MEM_P (src))
-    emit_insn (gen_bswap<mode>2_load (dest, src));
+    {
+       src = rs6000_force_indexed_or_indirect_mem (src);
+       emit_insn (gen_bswap<mode>2_load (dest, src));
+    }
   else if (MEM_P (dest))
-    emit_insn (gen_bswap<mode>2_store (dest, src));
+    {
+       dest = rs6000_force_indexed_or_indirect_mem (dest);
+       emit_insn (gen_bswap<mode>2_store (dest, src));
+    }
   else
     emit_insn (gen_bswap<mode>2_reg (dest, src));
   DONE;
@@ -2421,13 +2427,13 @@

 (define_insn "bswap<mode>2_load"
   [(set (match_operand:HSI 0 "gpc_reg_operand" "=r")
-       (bswap:HSI (match_operand:HSI 1 "memory_operand" "Z")))]
+       (bswap:HSI (match_operand:HSI 1 "indexed_or_indirect_operand" "Z")))]
   ""
   "l<wd>brx %0,%y1"
   [(set_attr "type" "load")])

 (define_insn "bswap<mode>2_store"
-  [(set (match_operand:HSI 0 "memory_operand" "=Z")
+  [(set (match_operand:HSI 0 "indexed_or_indirect_operand" "=Z")
        (bswap:HSI (match_operand:HSI 1 "gpc_reg_operand" "r")))]
   ""
   "st<wd>brx %1,%y0"




-- 
Aaron Sawdey, Ph.D.  acsaw...@linux.vnet.ibm.com
050-2/C113  (507) 253-7520 home: 507/263-0782
IBM Linux Technology Center - PPC Toolchain