[Qemu-devel] [PATCH v3 19/69] target/arm: Convert T32 ADDW/SUBW

[Richard Henderson <richard.henderson@linaro.org>]

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/translate.c | 24 +++++++++++++-----------
 target/arm/a32.decode  |  1 +
 target/arm/t32.decode  | 19 +++++++++++++++++++
 3 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/target/arm/translate.c b/target/arm/translate.c
index ad4b3c55c6..257ee6b5ea 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -7622,6 +7622,11 @@ static void arm_skip_unless(DisasContext *s, uint32_t cond)
  * Constant expanders for the decoders.
  */
 
+static int negate(DisasContext *s, int x)
+{
+    return -x;
+}
+
 static int times_2(DisasContext *s, int x)
 {
     return x * 2;
@@ -7978,6 +7983,12 @@ static bool trans_ORN_rri(DisasContext *s, arg_s_rri_rot *a)
 #undef DO_ANY2
 #undef DO_CMP2
 
+static bool trans_ADR(DisasContext *s, arg_ri *a)
+{
+    store_reg_bx(s, a->rd, add_reg_for_lit(s, 15, a->imm));
+    return true;
+}
+
 /*
  * Multiply and multiply accumulate
  */
@@ -10682,17 +10693,8 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
                         }
                         store_reg(s, rd, tmp);
                     } else {
-                        /* Add/sub 12-bit immediate.  */
-                        if (insn & (1 << 23)) {
-                            imm = -imm;
-                        }
-                        tmp = add_reg_for_lit(s, rn, imm);
-                        if (rn == 13 && rd == 13) {
-                            /* ADD SP, SP, imm or SUB SP, SP, imm */
-                            store_sp_checked(s, tmp);
-                        } else {
-                            store_reg(s, rd, tmp);
-                        }
+                        /* Add/sub 12-bit immediate, in decodetree */
+                        goto illegal_op;
                     }
                 }
             } else {
diff --git a/target/arm/a32.decode b/target/arm/a32.decode
index c7f156be6d..aac991664d 100644
--- a/target/arm/a32.decode
+++ b/target/arm/a32.decode
@@ -30,6 +30,7 @@
 &rrrr            rd rn rm ra
 &rrr             rd rn rm
 &rr              rd rm
+&ri              rd imm
 &r               rm
 &i               imm
 &msr_reg         rn r mask
diff --git a/target/arm/t32.decode b/target/arm/t32.decode
index 5116c6165a..be4e5f087c 100644
--- a/target/arm/t32.decode
+++ b/target/arm/t32.decode
@@ -27,6 +27,7 @@
 &rrrr            !extern rd rn rm ra
 &rrr             !extern rd rn rm
 &rr              !extern rd rm
+&ri              !extern rd imm
 &r               !extern rm
 &i               !extern imm
 &msr_reg         !extern rn r mask
@@ -121,6 +122,24 @@ SBC_rri          1111 0.0 1011 . .... 0 ... .... ........     @s_rri_rot
 }
 RSB_rri          1111 0.0 1110 . .... 0 ... .... ........     @s_rri_rot
 
+# Data processing (plain binary immediate)
+
+%imm12_26_12_0   26:1 12:3 0:8
+%neg12_26_12_0   26:1 12:3 0:8 !function=negate
+@s0_rri_12       .... ... .... . rn:4 . ... rd:4 ........ \
+                 &s_rri_rot imm=%imm12_26_12_0 rot=0 s=0
+
+{
+  ADR            1111 0.1 0000 0 1111 0 ... rd:4 ........ \
+                 &ri imm=%imm12_26_12_0
+  ADD_rri        1111 0.1 0000 0 .... 0 ... .... ........     @s0_rri_12
+}
+{
+  ADR            1111 0.1 0101 0 1111 0 ... rd:4 ........ \
+                 &ri imm=%neg12_26_12_0
+  SUB_rri        1111 0.1 0101 0 .... 0 ... .... ........     @s0_rri_12
+}
+
 # Multiply and multiply accumulate
 
 @s0_rnadm        .... .... .... rn:4 ra:4 rd:4 .... rm:4      &s_rrrr s=0
-- 
2.17.1