Hexagon (target/hexagon) Move pred_written to DisasContext

The pred_written variable 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: <20230427230012.3800327-20-tsimpson@quicinc.com>

target/hexagon/cpu.h

@@ -98,8 +98,6 @@ typedef struct CPUArchState {
     target_ulong this_PC;
     target_ulong reg_written[TOTAL_PER_THREAD_REGS];
 
-    target_ulong pred_written;
-
     MemLog mem_log_stores[STORES_MAX];
     target_ulong pkt_has_store_s1;
     target_ulong dczero_addr;

target/hexagon/genptr.c

@@ -151,7 +151,7 @@ void gen_log_pred_write(DisasContext *ctx, int pnum, TCGv val)
         tcg_gen_and_tl(pred, pred, base_val);
     }
     if (HEX_DEBUG) {
-        tcg_gen_ori_tl(hex_pred_written, hex_pred_written, 1 << pnum);
+        tcg_gen_ori_tl(ctx->pred_written, ctx->pred_written, 1 << pnum);
     }
     set_bit(pnum, ctx->pregs_written);
 }

target/hexagon/helper.h

@@ -21,7 +21,7 @@
 DEF_HELPER_FLAGS_2(raise_exception, TCG_CALL_NO_RETURN, noreturn, env, i32)
 DEF_HELPER_1(debug_start_packet, void, env)
 DEF_HELPER_FLAGS_3(debug_check_store_width, TCG_CALL_NO_WG, void, env, int, int)
-DEF_HELPER_FLAGS_3(debug_commit_end, TCG_CALL_NO_WG, void, env, int, int)
+DEF_HELPER_FLAGS_4(debug_commit_end, TCG_CALL_NO_WG, void, env, int, int, int)
 DEF_HELPER_2(commit_store, void, env, int)
 DEF_HELPER_3(gather_store, void, env, i32, int)
 DEF_HELPER_1(commit_hvx_stores, void, env)

target/hexagon/op_helper.c

@@ -203,7 +203,8 @@ static void print_store(CPUHexagonState *env, int slot)
 }
 
 /* This function is a handy place to set a breakpoint */
-void HELPER(debug_commit_end)(CPUHexagonState *env, int has_st0, int has_st1)
+void HELPER(debug_commit_end)(CPUHexagonState *env,
+                              int pred_written, int has_st0, int has_st1)
 {
     bool reg_printed = false;
     bool pred_printed = false;
@@ -225,7 +226,7 @@ void HELPER(debug_commit_end)(CPUHexagonState *env, int has_st0, int has_st1)
     }
 
     for (i = 0; i < NUM_PREGS; i++) {
-        if (env->pred_written & (1 << i)) {
+        if (pred_written & (1 << i)) {
             if (!pred_printed) {
                 HEX_DEBUG_LOG("Predicates written\n");
                 pred_printed = true;

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_pred_written;
 TCGv hex_store_addr[STORES_MAX];
 TCGv hex_store_width[STORES_MAX];
 TCGv hex_store_val32[STORES_MAX];
@@ -549,7 +548,8 @@ static void gen_start_packet(DisasContext *ctx)
         }
     }
     if (HEX_DEBUG) {
-        tcg_gen_movi_tl(hex_pred_written, 0);
+        ctx->pred_written = tcg_temp_new();
+        tcg_gen_movi_tl(ctx->pred_written, 0);
     }
 
     /* Preload the predicated registers into get_result_gpr(ctx, i) */
@@ -1007,7 +1007,8 @@ static void gen_commit_packet(DisasContext *ctx)
             tcg_constant_tl(pkt->pkt_has_store_s1 && !pkt->pkt_has_dczeroa);
 
         /* Handy place to set a breakpoint at the end of execution */
-        gen_helper_debug_commit_end(cpu_env, has_st0, has_st1);
+        gen_helper_debug_commit_end(cpu_env, ctx->pred_written,
+                                    has_st0, has_st1);
     }
 
     if (pkt->vhist_insn != NULL) {
@@ -1200,8 +1201,6 @@ void hexagon_translate_init(void)
             offsetof(CPUHexagonState, pred[i]),
             hexagon_prednames[i]);
     }
-    hex_pred_written = tcg_global_mem_new(cpu_env,
-        offsetof(CPUHexagonState, pred_written), "pred_written");
     hex_this_PC = tcg_global_mem_new(cpu_env,
         offsetof(CPUHexagonState, this_PC), "this_PC");
     hex_slot_cancelled = tcg_global_mem_new(cpu_env,

target/hexagon/translate.h

@@ -71,6 +71,7 @@ typedef struct DisasContext {
     bool has_hvx_helper;
     TCGv new_value[TOTAL_PER_THREAD_REGS];
     TCGv new_pred_value[NUM_PREGS];
+    TCGv pred_written;
 } DisasContext;
 
 static inline void ctx_log_pred_write(DisasContext *ctx, int pnum)
@@ -194,7 +195,6 @@ 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_pred_written;
 extern TCGv hex_store_addr[STORES_MAX];
 extern TCGv hex_store_width[STORES_MAX];
 extern TCGv hex_store_val32[STORES_MAX];