Hexagon (target/hexagon) Move new_pred_value to DisasContext

The new_pred_value array in the CPUHexagonState is only used for
bookkeeping within the translation of a packet.  With recent changes
that eliminate the need to free TCGv variables, these make more sense
to be transient and kept in DisasContext.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230427230012.3800327-19-tsimpson@quicinc.com>

target/hexagon/cpu.h

@@ -98,7 +98,6 @@ typedef struct CPUArchState {
     target_ulong this_PC;
     target_ulong reg_written[TOTAL_PER_THREAD_REGS];
 
-    target_ulong new_pred_value[NUM_PREGS];
     target_ulong pred_written;
 
     MemLog mem_log_stores[STORES_MAX];

target/hexagon/gen_tcg.h

@@ -581,9 +581,9 @@
 #define fGEN_TCG_SL2_return_f(SHORTCODE) \
     gen_cond_return_subinsn(ctx, TCG_COND_NE, hex_pred[0])
 #define fGEN_TCG_SL2_return_tnew(SHORTCODE) \
-    gen_cond_return_subinsn(ctx, TCG_COND_EQ, hex_new_pred_value[0])
+    gen_cond_return_subinsn(ctx, TCG_COND_EQ, ctx->new_pred_value[0])
 #define fGEN_TCG_SL2_return_fnew(SHORTCODE) \
-    gen_cond_return_subinsn(ctx, TCG_COND_NE, hex_new_pred_value[0])
+    gen_cond_return_subinsn(ctx, TCG_COND_NE, ctx->new_pred_value[0])
 
 /*
  * Mathematical operations with more than one definition require
@@ -1122,7 +1122,7 @@
 #define fGEN_TCG_SA1_clrtnew(SHORTCODE) \
     do { \
         tcg_gen_movcond_tl(TCG_COND_EQ, RdV, \
-                           hex_new_pred_value[0], tcg_constant_tl(0), \
+                           ctx->new_pred_value[0], tcg_constant_tl(0), \
                            RdV, tcg_constant_tl(0)); \
     } while (0)
 
@@ -1130,7 +1130,7 @@
 #define fGEN_TCG_SA1_clrfnew(SHORTCODE) \
     do { \
         tcg_gen_movcond_tl(TCG_COND_NE, RdV, \
-                           hex_new_pred_value[0], tcg_constant_tl(0), \
+                           ctx->new_pred_value[0], tcg_constant_tl(0), \
                            RdV, tcg_constant_tl(0)); \
     } while (0)
 
@@ -1157,9 +1157,9 @@
     gen_cond_jumpr31(ctx, TCG_COND_NE, hex_pred[0])
 
 #define fGEN_TCG_SL2_jumpr31_tnew(SHORTCODE) \
-    gen_cond_jumpr31(ctx, TCG_COND_EQ, hex_new_pred_value[0])
+    gen_cond_jumpr31(ctx, TCG_COND_EQ, ctx->new_pred_value[0])
 #define fGEN_TCG_SL2_jumpr31_fnew(SHORTCODE) \
-    gen_cond_jumpr31(ctx, TCG_COND_NE, hex_new_pred_value[0])
+    gen_cond_jumpr31(ctx, TCG_COND_NE, ctx->new_pred_value[0])
 
 /* Count trailing zeros/ones */
 #define fGEN_TCG_S2_ct0(SHORTCODE) \

target/hexagon/gen_tcg_funcs.py

@@ -198,7 +198,7 @@ def genptr_decl_new(f, tag, regtype, regid, regno):
         if regid in {"t", "u", "v"}:
             f.write(
                 f"    TCGv {regtype}{regid}N = "
-                f"hex_new_pred_value[insn->regno[{regno}]];\n"
+                f"ctx->new_pred_value[insn->regno[{regno}]];\n"
             )
         else:
             print("Bad register parse: ", regtype, regid)

target/hexagon/genptr.c

@@ -121,7 +121,11 @@ static void gen_log_reg_write_pair(DisasContext *ctx, int rnum, TCGv_i64 val)
 TCGv get_result_pred(DisasContext *ctx, int pnum)
 {
     if (ctx->need_commit) {
-        return hex_new_pred_value[pnum];
+        if (ctx->new_pred_value[pnum] == NULL) {
+            ctx->new_pred_value[pnum] = tcg_temp_new();
+            tcg_gen_movi_tl(ctx->new_pred_value[pnum], 0);
+        }
+        return ctx->new_pred_value[pnum];
     } else {
         return hex_pred[pnum];
     }
@@ -607,7 +611,7 @@ static void gen_cmpnd_cmp_jmp(DisasContext *ctx,
         gen_log_pred_write(ctx, pnum, pred);
     } else {
         TCGv pred = tcg_temp_new();
-        tcg_gen_mov_tl(pred, hex_new_pred_value[pnum]);
+        tcg_gen_mov_tl(pred, ctx->new_pred_value[pnum]);
         gen_cond_jump(ctx, cond2, pred, pc_off);
     }
 }
@@ -664,7 +668,7 @@ static void gen_cmpnd_tstbit0_jmp(DisasContext *ctx,
         gen_log_pred_write(ctx, pnum, pred);
     } else {
         TCGv pred = tcg_temp_new();
-        tcg_gen_mov_tl(pred, hex_new_pred_value[pnum]);
+        tcg_gen_mov_tl(pred, ctx->new_pred_value[pnum]);
         gen_cond_jump(ctx, cond, pred, pc_off);
     }
 }

target/hexagon/idef-parser/parser-helpers.c

@@ -1854,7 +1854,7 @@ HexValue gen_rvalue_pred(Context *c, YYLTYPE *locp, HexValue *pred)
         *pred = gen_tmp(c, locp, 32, UNSIGNED);
         if (is_dotnew) {
             OUT(c, locp, "tcg_gen_mov_i32(", pred,
-                ", hex_new_pred_value[");
+                ", ctx->new_pred_value[");
             OUT(c, locp, pred_str, "]);\n");
         } else {
             OUT(c, locp, "gen_read_preg(", pred, ", ", pred_str, ");\n");

target/hexagon/op_helper.c

@@ -231,7 +231,7 @@ void HELPER(debug_commit_end)(CPUHexagonState *env, int has_st0, int has_st1)
                 pred_printed = true;
             }
             HEX_DEBUG_LOG("\tp%d = 0x" TARGET_FMT_lx "\n",
-                          i, env->new_pred_value[i]);
+                          i, env->pred[i]);
         }
     }
 

target/hexagon/translate.c

@@ -46,7 +46,6 @@ TCGv hex_slot_cancelled;
 TCGv hex_branch_taken;
 TCGv hex_new_value_usr;
 TCGv hex_reg_written[TOTAL_PER_THREAD_REGS];
-TCGv hex_new_pred_value[NUM_PREGS];
 TCGv hex_pred_written;
 TCGv hex_store_addr[STORES_MAX];
 TCGv hex_store_width[STORES_MAX];
@@ -515,6 +514,9 @@ static void gen_start_packet(DisasContext *ctx)
     for (i = 0; i < TOTAL_PER_THREAD_REGS; i++) {
         ctx->new_value[i] = NULL;
     }
+    for (i = 0; i < NUM_PREGS; i++) {
+        ctx->new_pred_value[i] = NULL;
+    }
 
     analyze_packet(ctx);
 
@@ -568,7 +570,8 @@ static void gen_start_packet(DisasContext *ctx)
     if (ctx->need_commit && pkt->pkt_has_endloop) {
         for (int i = 0; i < ctx->preg_log_idx; i++) {
             int pred_num = ctx->preg_log[i];
-            tcg_gen_mov_tl(hex_new_pred_value[pred_num], hex_pred[pred_num]);
+            ctx->new_pred_value[pred_num] = tcg_temp_new();
+            tcg_gen_mov_tl(ctx->new_pred_value[pred_num], hex_pred[pred_num]);
         }
     }
 
@@ -691,7 +694,7 @@ static void gen_pred_writes(DisasContext *ctx)
 
     for (int i = 0; i < ctx->preg_log_idx; i++) {
         int pred_num = ctx->preg_log[i];
-        tcg_gen_mov_tl(hex_pred[pred_num], hex_new_pred_value[pred_num]);
+        tcg_gen_mov_tl(hex_pred[pred_num], ctx->new_pred_value[pred_num]);
     }
 }
 
@@ -1162,7 +1165,6 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int *max_insns,
 
 #define NAME_LEN               64
 static char reg_written_names[TOTAL_PER_THREAD_REGS][NAME_LEN];
-static char new_pred_value_names[NUM_PREGS][NAME_LEN];
 static char store_addr_names[STORES_MAX][NAME_LEN];
 static char store_width_names[STORES_MAX][NAME_LEN];
 static char store_val32_names[STORES_MAX][NAME_LEN];
@@ -1197,12 +1199,6 @@ void hexagon_translate_init(void)
         hex_pred[i] = tcg_global_mem_new(cpu_env,
             offsetof(CPUHexagonState, pred[i]),
             hexagon_prednames[i]);
-
-        snprintf(new_pred_value_names[i], NAME_LEN, "new_pred_%s",
-                 hexagon_prednames[i]);
-        hex_new_pred_value[i] = tcg_global_mem_new(cpu_env,
-            offsetof(CPUHexagonState, new_pred_value[i]),
-            new_pred_value_names[i]);
     }
     hex_pred_written = tcg_global_mem_new(cpu_env,
         offsetof(CPUHexagonState, pred_written), "pred_written");

target/hexagon/translate.h

@@ -70,6 +70,7 @@ typedef struct DisasContext {
     bool short_circuit;
     bool has_hvx_helper;
     TCGv new_value[TOTAL_PER_THREAD_REGS];
+    TCGv new_pred_value[NUM_PREGS];
 } DisasContext;
 
 static inline void ctx_log_pred_write(DisasContext *ctx, int pnum)
@@ -193,7 +194,6 @@ extern TCGv hex_slot_cancelled;
 extern TCGv hex_branch_taken;
 extern TCGv hex_new_value_usr;
 extern TCGv hex_reg_written[TOTAL_PER_THREAD_REGS];
-extern TCGv hex_new_pred_value[NUM_PREGS];
 extern TCGv hex_pred_written;
 extern TCGv hex_store_addr[STORES_MAX];
 extern TCGv hex_store_width[STORES_MAX];