[PULL 21/37] target/i386: Use DISAS_TOO_MANY to exit after gen_io_start

[Paolo Bonzini]

From: Richard Henderson <richard.henderson@linaro.org>

We can set is_jmp early, using only one if, and let that
be overwritten by gen_rep*'s calls to gen_jmp_tb.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221001140935.465607-17-richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/tcg/translate.c | 42 +++++++++----------------------------
 1 file changed, 10 insertions(+), 32 deletions(-)

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index be29ea7a03..11aaba8a65 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -5660,14 +5660,12 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
             }
             if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
                 gen_io_start();
+                s->base.is_jmp = DISAS_TOO_MANY;
             }
             gen_helper_rdrand(s->T0, cpu_env);
             rm = (modrm & 7) | REX_B(s);
             gen_op_mov_reg_v(s, dflag, rm, s->T0);
             set_cc_op(s, CC_OP_EFLAGS);
-            if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                gen_jmp(s, s->pc - s->cs_base);
-            }
             break;
 
         default:
@@ -6704,15 +6702,12 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
+            s->base.is_jmp = DISAS_TOO_MANY;
         }
         if (prefixes & (PREFIX_REPZ | PREFIX_REPNZ)) {
             gen_repz_ins(s, ot);
-            /* jump generated by gen_repz_ins */
         } else {
             gen_ins(s, ot);
-            if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                gen_jmp(s, s->pc - s->cs_base);
-            }
         }
         break;
     case 0x6e: /* outsS */
@@ -6725,15 +6720,12 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
+            s->base.is_jmp = DISAS_TOO_MANY;
         }
         if (prefixes & (PREFIX_REPZ | PREFIX_REPNZ)) {
             gen_repz_outs(s, ot);
-            /* jump generated by gen_repz_outs */
         } else {
             gen_outs(s, ot);
-            if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                gen_jmp(s, s->pc - s->cs_base);
-            }
         }
         break;
 
@@ -6750,13 +6742,11 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
+            s->base.is_jmp = DISAS_TOO_MANY;
         }
         gen_helper_in_func(ot, s->T1, s->tmp2_i32);
         gen_op_mov_reg_v(s, ot, R_EAX, s->T1);
         gen_bpt_io(s, s->tmp2_i32, ot);
-        if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_jmp(s, s->pc - s->cs_base);
-        }
         break;
     case 0xe6:
     case 0xe7:
@@ -6768,14 +6758,12 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
+            s->base.is_jmp = DISAS_TOO_MANY;
         }
         gen_op_mov_v_reg(s, ot, s->T1, R_EAX);
         tcg_gen_trunc_tl_i32(s->tmp3_i32, s->T1);
         gen_helper_out_func(ot, s->tmp2_i32, s->tmp3_i32);
         gen_bpt_io(s, s->tmp2_i32, ot);
-        if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_jmp(s, s->pc - s->cs_base);
-        }
         break;
     case 0xec:
     case 0xed:
@@ -6787,13 +6775,11 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
+            s->base.is_jmp = DISAS_TOO_MANY;
         }
         gen_helper_in_func(ot, s->T1, s->tmp2_i32);
         gen_op_mov_reg_v(s, ot, R_EAX, s->T1);
         gen_bpt_io(s, s->tmp2_i32, ot);
-        if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_jmp(s, s->pc - s->cs_base);
-        }
         break;
     case 0xee:
     case 0xef:
@@ -6805,14 +6791,12 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         }
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
+            s->base.is_jmp = DISAS_TOO_MANY;
         }
         gen_op_mov_v_reg(s, ot, s->T1, R_EAX);
         tcg_gen_trunc_tl_i32(s->tmp3_i32, s->T1);
         gen_helper_out_func(ot, s->tmp2_i32, s->tmp3_i32);
         gen_bpt_io(s, s->tmp2_i32, ot);
-        if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_jmp(s, s->pc - s->cs_base);
-        }
         break;
 
         /************************/
@@ -7478,11 +7462,9 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
         gen_update_eip_cur(s);
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
+            s->base.is_jmp = DISAS_TOO_MANY;
         }
         gen_helper_rdtsc(cpu_env);
-        if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_jmp(s, s->pc - s->cs_base);
-        }
         break;
     case 0x133: /* rdpmc */
         gen_update_cc_op(s);
@@ -7939,11 +7921,9 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
             gen_update_eip_cur(s);
             if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
                 gen_io_start();
+                s->base.is_jmp = DISAS_TOO_MANY;
             }
             gen_helper_rdtscp(cpu_env);
-            if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                gen_jmp(s, s->pc - s->cs_base);
-            }
             break;
 
         default:
@@ -8307,6 +8287,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
 
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
+            s->base.is_jmp = DISAS_TOO_MANY;
         }
         if (b & 2) {
             gen_svm_check_intercept(s, SVM_EXIT_WRITE_CR0 + reg);
@@ -8317,9 +8298,6 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
             gen_svm_check_intercept(s, SVM_EXIT_READ_CR0 + reg);
             gen_helper_read_crN(s->T0, cpu_env, tcg_constant_i32(reg));
             gen_op_mov_reg_v(s, ot, rm, s->T0);
-            if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                gen_jmp(s, s->pc - s->cs_base);
-            }
         }
         break;
 
-- 
2.37.3