[v4,01/69] target/arm: Use store_reg_from_load in thumb2 code

Commit Message

Richard Henderson Sept. 4, 2019, 7:29 p.m. UTC

This function already includes the test for an interworking write
to PC from a load.  Change the T32 LDM implementation to match the
A32 LDM implementation.

For LDM, the reordering of the tests does not change valid
behaviour because the only case that differs is has rn == 15,
which is UNPREDICTABLE.

Reviewed-by: Peter Maydell <[e-mail]>
Signed-off-by: Richard Henderson <[e-mail]>
---
 target/arm/translate.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

Patch

diff --git a/target/arm/translate.c b/target/arm/translate.c
index b0d32ff8c9..a39f792463 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -9742,13 +9742,11 @@  static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
                         /* Load.  */
                         tmp = tcg_temp_new_i32();
                         gen_aa32_ld32u(s, tmp, addr, get_mem_index(s));
-                        if (i == 15) {
-                            gen_bx_excret(s, tmp);
-                        } else if (i == rn) {
+                        if (i == rn) {
                             loaded_var = tmp;
                             loaded_base = 1;
                         } else {
-                            store_reg(s, i, tmp);
+                            store_reg_from_load(s, i, tmp);
                         }
                     } else {
                         /* Store.  */
@@ -10889,11 +10887,7 @@  static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
                 tcg_temp_free_i32(addr);
                 goto illegal_op;
             }
-            if (rs == 15) {
-                gen_bx_excret(s, tmp);
-            } else {
-                store_reg(s, rs, tmp);
-            }
+            store_reg_from_load(s, rs, tmp);
         } else {
             /* Store.  */
             tmp = load_reg(s, rs);