[v3,13/26] target/i386: Introduce DISAS_JUMP

Commit Message

Richard Henderson Oct. 1, 2022, 2:09 p.m. UTC

Drop the unused dest argument to gen_jr().
Remove most of the calls to gen_jr, and use DISAS_JUMP.
Remove some unused loads of eip for lcall and ljmp.

Reviewed-by: Paolo Bonzini <[e-mail]>
Signed-off-by: Richard Henderson <[e-mail]>
---
 target/i386/tcg/translate.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

Patch

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index c8ef9f0356..7db6f617a1 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -135,6 +135,7 @@  typedef struct DisasContext {
 #define DISAS_EOB_ONLY         DISAS_TARGET_0
 #define DISAS_EOB_NEXT         DISAS_TARGET_1
 #define DISAS_EOB_INHIBIT_IRQ  DISAS_TARGET_2
+#define DISAS_JUMP             DISAS_TARGET_3
 
 /* The environment in which user-only runs is constrained. */
 #ifdef CONFIG_USER_ONLY
@@ -222,7 +223,7 @@  STUB_HELPER(wrmsr, TCGv_env env)
 #endif
 
 static void gen_eob(DisasContext *s);
-static void gen_jr(DisasContext *s, TCGv dest);
+static void gen_jr(DisasContext *s);
 static void gen_jmp(DisasContext *s, target_ulong eip);
 static void gen_jmp_tb(DisasContext *s, target_ulong eip, int tb_num);
 static void gen_op(DisasContext *s1, int op, MemOp ot, int d);
@@ -2385,7 +2386,7 @@  static void gen_goto_tb(DisasContext *s, int tb_num, target_ulong eip)
     } else {
         /* jump to another page */
         gen_jmp_im(s, eip);
-        gen_jr(s, s->tmp0);
+        gen_jr(s);
     }
 }
 
@@ -2754,7 +2755,7 @@  static void gen_eob(DisasContext *s)
 }
 
 /* Jump to register */
-static void gen_jr(DisasContext *s, TCGv dest)
+static void gen_jr(DisasContext *s)
 {
     do_gen_eob_worker(s, false, false, true);
 }
@@ -5328,7 +5329,7 @@  static bool disas_insn(DisasContext *s, CPUState *cpu)
             gen_push_v(s, s->T1);
             gen_op_jmp_v(s->T0);
             gen_bnd_jmp(s);
-            gen_jr(s, s->T0);
+            s->base.is_jmp = DISAS_JUMP;
             break;
         case 3: /* lcall Ev */
             if (mod == 3) {
@@ -5349,8 +5350,7 @@  static bool disas_insn(DisasContext *s, CPUState *cpu)
                                       tcg_const_i32(dflag - 1),
                                       tcg_const_i32(s->pc - s->cs_base));
             }
-            tcg_gen_ld_tl(s->tmp4, cpu_env, offsetof(CPUX86State, eip));
-            gen_jr(s, s->tmp4);
+            s->base.is_jmp = DISAS_JUMP;
             break;
         case 4: /* jmp Ev */
             if (dflag == MO_16) {
@@ -5358,7 +5358,7 @@  static bool disas_insn(DisasContext *s, CPUState *cpu)
             }
             gen_op_jmp_v(s->T0);
             gen_bnd_jmp(s);
-            gen_jr(s, s->T0);
+            s->base.is_jmp = DISAS_JUMP;
             break;
         case 5: /* ljmp Ev */
             if (mod == 3) {
@@ -5376,8 +5376,7 @@  static bool disas_insn(DisasContext *s, CPUState *cpu)
                 gen_op_movl_seg_T0_vm(s, R_CS);
                 gen_op_jmp_v(s->T1);
             }
-            tcg_gen_ld_tl(s->tmp4, cpu_env, offsetof(CPUX86State, eip));
-            gen_jr(s, s->tmp4);
+            s->base.is_jmp = DISAS_JUMP;
             break;
         case 6: /* push Ev */
             gen_push_v(s, s->T0);
@@ -6808,7 +6807,7 @@  static bool disas_insn(DisasContext *s, CPUState *cpu)
         /* Note that gen_pop_T0 uses a zero-extending load.  */
         gen_op_jmp_v(s->T0);
         gen_bnd_jmp(s);
-        gen_jr(s, s->T0);
+        s->base.is_jmp = DISAS_JUMP;
         break;
     case 0xc3: /* ret */
         ot = gen_pop_T0(s);
@@ -6816,7 +6815,7 @@  static bool disas_insn(DisasContext *s, CPUState *cpu)
         /* Note that gen_pop_T0 uses a zero-extending load.  */
         gen_op_jmp_v(s->T0);
         gen_bnd_jmp(s);
-        gen_jr(s, s->T0);
+        s->base.is_jmp = DISAS_JUMP;
         break;
     case 0xca: /* lret im */
         val = x86_ldsw_code(env, s);
@@ -8846,6 +8845,9 @@  static void i386_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
         gen_update_eip_cur(dc);
         gen_eob_inhibit_irq(dc, true);
         break;
+    case DISAS_JUMP:
+        gen_jr(dc);
+        break;
     default:
         g_assert_not_reached();
     }