target/arm: Clean up disas_thumb_insn

Now that everything is converted, remove the rest of
the legacy decode.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190904193059.26202-69-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/target/arm/translate.c b/target/arm/translate.c
index a99a5c2eef40491cb99ab1f66f2d28cfe36bc8f0..2412dde631f3cd17ce614347e3c73d38eef3bef0 100644 (file)
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -10770,32 +10770,9 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
 
 static void disas_thumb_insn(DisasContext *s, uint32_t insn)
 {
-    if (disas_t16(s, insn)) {
-        return;
-    }
-    /* fall back to legacy decoder */
-
-    switch (insn >> 12) {
-    case 0: case 1: /* add/sub (3reg, 2reg imm), shift imm; in decodetree */
-    case 2: case 3: /* add, sub, cmp, mov (reg, imm), in decodetree */
-    case 4: /* ldr lit, data proc (2reg), data proc ext, bx; in decodetree */
-    case 5: /* load/store register offset, in decodetree */
-    case 6: /* load/store word immediate offset, in decodetree */
-    case 7: /* load/store byte immediate offset, in decodetree */
-    case 8: /* load/store halfword immediate offset, in decodetree */
-    case 9: /* load/store from stack, in decodetree */
-    case 10: /* add PC/SP (immediate), in decodetree */
-    case 11: /* misc, in decodetree */
-    case 12: /* load/store multiple, in decodetree */
-    case 13: /* conditional branch or swi, in decodetree */
-    case 14:
-    case 15:
-        /* branches, in decodetree */
-        goto illegal_op;
+    if (!disas_t16(s, insn)) {
+        unallocated_encoding(s);
     }
-    return;
-illegal_op:
-    unallocated_encoding(s);
 }
 
 static bool insn_crosses_page(CPUARMState *env, DisasContext *s)