target/arm: Pull calls to disas_sve() and disas_sme() out of legacy decoder

The SVE and SME decode is already done by decodetree.  Pull the calls
to these decoders out of the legacy decoder.  This doesn't change
behaviour because all the patterns in sve.decode and sme.decode
already require the bits that the legacy decoder is decoding to have
the correct values.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230512144106.3608981-4-peter.maydell@linaro.org

diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 7862e9dd4e32510ea7509a4656ee18421c57d0c7..1fd6f97b641591c418701494d30550604f8f36b1 100644 (file)
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -14205,19 +14205,6 @@ static bool btype_destination_ok(uint32_t insn, bool bt, int btype)
 static void disas_a64_legacy(DisasContext *s, uint32_t insn)
 {
     switch (extract32(insn, 25, 4)) {
-    case 0x0:
-        if (!extract32(insn, 31, 1) || !disas_sme(s, insn)) {
-            unallocated_encoding(s);
-        }
-        break;
-    case 0x1: case 0x3: /* UNALLOCATED */
-        unallocated_encoding(s);
-        break;
-    case 0x2:
-        if (!disas_sve(s, insn)) {
-            unallocated_encoding(s);
-        }
-        break;
     case 0x8: case 0x9: /* Data processing - immediate */
         disas_data_proc_imm(s, insn);
         break;
@@ -14239,7 +14226,7 @@ static void disas_a64_legacy(DisasContext *s, uint32_t insn)
         disas_data_proc_simd_fp(s, insn);
         break;
     default:
-        assert(FALSE); /* all 15 cases should be handled above */
+        unallocated_encoding(s);
         break;
     }
 }
@@ -14445,8 +14432,9 @@ static void aarch64_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
         disas_sme_fa64(s, insn);
     }
 
-
-    if (!disas_a64(s, insn)) {
+    if (!disas_a64(s, insn) &&
+        !disas_sme(s, insn) &&
+        !disas_sve(s, insn)) {
         disas_a64_legacy(s, insn);
     }