target/arm: Simplify aa32 DISAS_WFI

The length of the previous insn may be computed from
the difference of start and end addresses.
Use tcg_constant_i32 while we're at it.

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

diff --git a/target/arm/translate.c b/target/arm/translate.c
index 086dc0d3b1505a68180b0c0d4e6a94805b2972ea..d09692c125bb37e6a66e96d63e75db60a29a3922 100644 (file)
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -9870,18 +9870,14 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
             /* nothing more to generate */
             break;
         case DISAS_WFI:
-        {
-            TCGv_i32 tmp = tcg_const_i32((dc->thumb &&
-                                          !(dc->insn & (1U << 31))) ? 2 : 4);
-
-            gen_helper_wfi(cpu_env, tmp);
-            tcg_temp_free_i32(tmp);
-            /* The helper doesn't necessarily throw an exception, but we
+            gen_helper_wfi(cpu_env,
+                           tcg_constant_i32(dc->base.pc_next - dc->pc_curr));
+            /*
+             * The helper doesn't necessarily throw an exception, but we
              * must go back to the main loop to check for interrupts anyway.
              */
             tcg_gen_exit_tb(NULL, 0);
             break;
-        }
         case DISAS_WFE:
             gen_helper_wfe(cpu_env);
             break;