target/arc: v2: rewrite translation functions for memory operations

Replace the existing auto-generated arc_gen_*() functions for all
variants of LD, ST, PUSH, and POP instructions by hand-written ones. The
new routines allocate fewer temporary registers and perform fewer
operations.

These changes have been validated by running the check-tcg and
dcc.dg/dg.exp tests, as well as booting Linux for archs and hs5x CPUs.

Signed-off-by: Artemiy Volkov <[email protected]>

Author: artemiy-volkov

target/arc/arc-common.h

@@ -59,8 +59,8 @@ typedef struct {
     uint8_t n_ops;
     uint8_t cc;
     uint8_t op;
-    uint8_t aa;
-    uint8_t zz;
+    uint8_t aa : 2;
+    uint8_t zz : 2;
 #define zz_as_data_size zz
     bool aq;
     bool rl;

target/arc/decoder-v2.c

@@ -187,7 +187,7 @@ load_insninfo_if_valid_v2(uint64_t insn,
                         ret.zz = 2;
                         break;
                     default:
-                        ret.zz = 4;
+                        ret.zz = 0;
                         break;
                     }
                 }