target/m68k: Drop mark_to_release

Translators are no longer required to free tcg temporaries,
therefore there's no need to record temps for later freeing.

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

target/m68k/translate.c

@@ -121,35 +121,9 @@ typedef struct DisasContext {
     int done_mac;
     int writeback_mask;
     TCGv writeback[8];
-#define MAX_TO_RELEASE 8
-    int release_count;
-    TCGv release[MAX_TO_RELEASE];
     bool ss_active;
 } DisasContext;
 
-static void init_release_array(DisasContext *s)
-{
-#ifdef CONFIG_DEBUG_TCG
-    memset(s->release, 0, sizeof(s->release));
-#endif
-    s->release_count = 0;
-}
-
-static void do_release(DisasContext *s)
-{
-    int i;
-    for (i = 0; i < s->release_count; i++) {
-        tcg_temp_free(s->release[i]);
-    }
-    init_release_array(s);
-}
-
-static TCGv mark_to_release(DisasContext *s, TCGv tmp)
-{
-    g_assert(s->release_count < MAX_TO_RELEASE);
-    return s->release[s->release_count++] = tmp;
-}
-
 static TCGv get_areg(DisasContext *s, unsigned regno)
 {
     if (s->writeback_mask & (1 << regno)) {
@@ -396,8 +370,7 @@ static TCGv gen_ldst(DisasContext *s, int opsize, TCGv addr, TCGv val,
         gen_store(s, opsize, addr, val, index);
         return store_dummy;
     } else {
-        return mark_to_release(s, gen_load(s, opsize, addr,
+        return gen_load(s, opsize, addr, what == EA_LOADS, index);
-                                           what == EA_LOADS, index));
     }
 }
 
@@ -491,7 +464,7 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
         } else {
             bd = 0;
         }
-        tmp = mark_to_release(s, tcg_temp_new());
+        tmp = tcg_temp_new();
         if ((ext & 0x44) == 0) {
             /* pre-index */
             add = gen_addr_index(s, ext, tmp);
@@ -501,7 +474,7 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
         if ((ext & 0x80) == 0) {
             /* base not suppressed */
             if (IS_NULL_QREG(base)) {
-                base = mark_to_release(s, tcg_const_i32(offset + bd));
+                base = tcg_const_i32(offset + bd);
                 bd = 0;
             }
             if (!IS_NULL_QREG(add)) {
@@ -517,11 +490,11 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
                 add = tmp;
             }
         } else {
-            add = mark_to_release(s, tcg_const_i32(bd));
+            add = tcg_const_i32(bd);
         }
         if ((ext & 3) != 0) {
             /* memory indirect */
-            base = mark_to_release(s, gen_load(s, OS_LONG, add, 0, IS_USER(s)));
+            base = gen_load(s, OS_LONG, add, 0, IS_USER(s));
             if ((ext & 0x44) == 4) {
                 add = gen_addr_index(s, ext, tmp);
                 tcg_gen_add_i32(tmp, add, base);
@@ -546,7 +519,7 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
         }
     } else {
         /* brief extension word format */
-        tmp = mark_to_release(s, tcg_temp_new());
+        tmp = tcg_temp_new();
         add = gen_addr_index(s, ext, tmp);
         if (!IS_NULL_QREG(base)) {
             tcg_gen_add_i32(tmp, add, base);
@@ -676,7 +649,7 @@ static inline TCGv gen_extend(DisasContext *s, TCGv val, int opsize, int sign)
     if (opsize == OS_LONG) {
         tmp = val;
     } else {
-        tmp = mark_to_release(s, tcg_temp_new());
+        tmp = tcg_temp_new();
         gen_ext(tmp, val, opsize, sign);
     }
 
@@ -802,7 +775,7 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s,
             return NULL_QREG;
         }
         reg = get_areg(s, reg0);
-        tmp = mark_to_release(s, tcg_temp_new());
+        tmp = tcg_temp_new();
         if (reg0 == 7 && opsize == OS_BYTE &&
             m68k_feature(s->env, M68K_FEATURE_M68K)) {
             tcg_gen_subi_i32(tmp, reg, 2);
@@ -812,7 +785,7 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s,
         return tmp;
     case 5: /* Indirect displacement.  */
         reg = get_areg(s, reg0);
-        tmp = mark_to_release(s, tcg_temp_new());
+        tmp = tcg_temp_new();
         ext = read_im16(env, s);
         tcg_gen_addi_i32(tmp, reg, (int16_t)ext);
         return tmp;
@@ -823,14 +796,14 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s,
         switch (reg0) {
         case 0: /* Absolute short.  */
             offset = (int16_t)read_im16(env, s);
-            return mark_to_release(s, tcg_const_i32(offset));
+            return tcg_const_i32(offset);
         case 1: /* Absolute long.  */
             offset = read_im32(env, s);
-            return mark_to_release(s, tcg_const_i32(offset));
+            return tcg_const_i32(offset);
         case 2: /* pc displacement  */
             offset = s->pc;
             offset += (int16_t)read_im16(env, s);
-            return mark_to_release(s, tcg_const_i32(offset));
+            return tcg_const_i32(offset);
         case 3: /* pc index+displacement.  */
             return gen_lea_indexed(env, s, NULL_QREG);
         case 4: /* Immediate.  */
@@ -958,7 +931,7 @@ static TCGv gen_ea_mode(CPUM68KState *env, DisasContext *s, int mode, int reg0,
             default:
                 g_assert_not_reached();
             }
-            return mark_to_release(s, tcg_const_i32(offset));
+            return tcg_const_i32(offset);
         default:
             return NULL_QREG;
         }
@@ -6287,7 +6260,6 @@ static void m68k_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cpu)
     dc->cc_op_synced = 1;
     dc->done_mac = 0;
     dc->writeback_mask = 0;
-    init_release_array(dc);
 
     dc->ss_active = (M68K_SR_TRACE(env->sr) == M68K_SR_TRACE_ANY_INS);
     /* If architectural single step active, limit to 1 */
@@ -6314,7 +6286,6 @@ static void m68k_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
 
     opcode_table[insn](env, dc, insn);
     do_writebacks(dc);
-    do_release(dc);
 
     dc->pc_prev = dc->base.pc_next;
     dc->base.pc_next = dc->pc;