[Qemu-devel] [PATCH v2 11/36] target-microblaze: Make compute_ldst_addr always use a temp

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Make compute_ldst_addr always use a temp. This simplifies
the code a bit in preparation for adding support for
64bit addresses.

No functional change.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 target/microblaze/translate.c | 111 ++++++++++++++----------------------------
 1 file changed, 37 insertions(+), 74 deletions(-)

diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c
index 7bda643b0f..daed0b7e1f 100644
--- a/target/microblaze/translate.c
+++ b/target/microblaze/translate.c
@@ -848,7 +848,7 @@ static void dec_imm(DisasContext *dc)
     dc->clear_imm = 0;
 }
 
-static inline TCGv_i32 *compute_ldst_addr(DisasContext *dc, TCGv_i32 *t)
+static inline void compute_ldst_addr(DisasContext *dc, TCGv_i32 *t)
 {
     bool extimm = dc->tb_flags & IMM_FLAG;
     /* Should be set to true if r1 is used by loadstores.  */
@@ -861,47 +861,47 @@ static inline TCGv_i32 *compute_ldst_addr(DisasContext *dc, TCGv_i32 *t)
 
     /* Treat the common cases first.  */
     if (!dc->type_b) {
-        /* If any of the regs is r0, return a ptr to the other.  */
+        /* If any of the regs is r0, return the value of the other reg.  */
         if (dc->ra == 0) {
-            return &cpu_R[dc->rb];
+            tcg_gen_mov_i32(*t, cpu_R[dc->rb]);
+            return;
         } else if (dc->rb == 0) {
-            return &cpu_R[dc->ra];
+            tcg_gen_mov_i32(*t, cpu_R[dc->ra]);
+            return;
         }
 
         if (dc->rb == 1 && dc->cpu->cfg.stackprot) {
             stackprot = true;
         }
 
-        *t = tcg_temp_new_i32();
         tcg_gen_add_i32(*t, cpu_R[dc->ra], cpu_R[dc->rb]);
 
         if (stackprot) {
             gen_helper_stackprot(cpu_env, *t);
         }
-        return t;
+        return;
     }
     /* Immediate.  */
     if (!extimm) {
         if (dc->imm == 0) {
-            return &cpu_R[dc->ra];
+            tcg_gen_mov_i32(*t, cpu_R[dc->ra]);
+            return;
         }
-        *t = tcg_temp_new_i32();
         tcg_gen_movi_i32(*t, (int32_t)((int16_t)dc->imm));
         tcg_gen_add_i32(*t, cpu_R[dc->ra], *t);
     } else {
-        *t = tcg_temp_new_i32();
         tcg_gen_add_i32(*t, cpu_R[dc->ra], *(dec_alu_op_b(dc)));
     }
 
     if (stackprot) {
         gen_helper_stackprot(cpu_env, *t);
     }
-    return t;
+    return;
 }
 
 static void dec_load(DisasContext *dc)
 {
-    TCGv_i32 t, v, *addr;
+    TCGv_i32 v, addr;
     unsigned int size;
     bool rev = false, ex = false;
     TCGMemOp mop;
@@ -928,7 +928,8 @@ static void dec_load(DisasContext *dc)
                                                         ex ? "x" : "");
 
     t_sync_flags(dc);
-    addr = compute_ldst_addr(dc, &t);
+    addr = tcg_temp_new_i32();
+    compute_ldst_addr(dc, &addr);
 
     /*
      * When doing reverse accesses we need to do two things.
@@ -947,17 +948,10 @@ static void dec_load(DisasContext *dc)
                    11 -> 00 */
                 TCGv_i32 low = tcg_temp_new_i32();
 
-                /* Force addr into the temp.  */
-                if (addr != &t) {
-                    t = tcg_temp_new_i32();
-                    tcg_gen_mov_i32(t, *addr);
-                    addr = &t;
-                }
-
-                tcg_gen_andi_i32(low, t, 3);
+                tcg_gen_andi_i32(low, addr, 3);
                 tcg_gen_sub_i32(low, tcg_const_i32(3), low);
-                tcg_gen_andi_i32(t, t, ~3);
-                tcg_gen_or_i32(t, t, low);
+                tcg_gen_andi_i32(addr, addr, ~3);
+                tcg_gen_or_i32(addr, addr, low);
                 tcg_temp_free_i32(low);
                 break;
             }
@@ -965,14 +959,7 @@ static void dec_load(DisasContext *dc)
             case 2:
                 /* 00 -> 10
                    10 -> 00.  */
-                /* Force addr into the temp.  */
-                if (addr != &t) {
-                    t = tcg_temp_new_i32();
-                    tcg_gen_xori_i32(t, *addr, 2);
-                    addr = &t;
-                } else {
-                    tcg_gen_xori_i32(t, t, 2);
-                }
+                tcg_gen_xori_i32(addr, addr, 2);
                 break;
             default:
                 cpu_abort(CPU(dc->cpu), "Invalid reverse size\n");
@@ -982,13 +969,7 @@ static void dec_load(DisasContext *dc)
 
     /* lwx does not throw unaligned access errors, so force alignment */
     if (ex) {
-        /* Force addr into the temp.  */
-        if (addr != &t) {
-            t = tcg_temp_new_i32();
-            tcg_gen_mov_i32(t, *addr);
-            addr = &t;
-        }
-        tcg_gen_andi_i32(t, t, ~3);
+        tcg_gen_andi_i32(addr, addr, ~3);
     }
 
     /* If we get a fault on a dslot, the jmpstate better be in sync.  */
@@ -1002,16 +983,16 @@ static void dec_load(DisasContext *dc)
      * address and if that succeeds we write into the destination reg.
      */
     v = tcg_temp_new_i32();
-    tcg_gen_qemu_ld_i32(v, *addr, cpu_mmu_index(&dc->cpu->env, false), mop);
+    tcg_gen_qemu_ld_i32(v, addr, cpu_mmu_index(&dc->cpu->env, false), mop);
 
     if ((dc->cpu->env.pvr.regs[2] & PVR2_UNALIGNED_EXC_MASK) && size > 1) {
         tcg_gen_movi_i32(cpu_SR[SR_PC], dc->pc);
-        gen_helper_memalign(cpu_env, *addr, tcg_const_i32(dc->rd),
+        gen_helper_memalign(cpu_env, addr, tcg_const_i32(dc->rd),
                             tcg_const_i32(0), tcg_const_i32(size - 1));
     }
 
     if (ex) {
-        tcg_gen_mov_i32(env_res_addr, *addr);
+        tcg_gen_mov_i32(env_res_addr, addr);
         tcg_gen_mov_i32(env_res_val, v);
     }
     if (dc->rd) {
@@ -1024,13 +1005,12 @@ static void dec_load(DisasContext *dc)
         write_carryi(dc, 0);
     }
 
-    if (addr == &t)
-        tcg_temp_free_i32(t);
+    tcg_temp_free_i32(addr);
 }
 
 static void dec_store(DisasContext *dc)
 {
-    TCGv_i32 t, *addr, swx_addr;
+    TCGv_i32 addr;
     TCGLabel *swx_skip = NULL;
     unsigned int size;
     bool rev = false, ex = false;
@@ -1059,21 +1039,19 @@ static void dec_store(DisasContext *dc)
     t_sync_flags(dc);
     /* If we get a fault on a dslot, the jmpstate better be in sync.  */
     sync_jmpstate(dc);
-    addr = compute_ldst_addr(dc, &t);
+    /* SWX needs a temp_local.  */
+    addr = ex ? tcg_temp_local_new_i32() : tcg_temp_new_i32();
+    compute_ldst_addr(dc, &addr);
 
-    swx_addr = tcg_temp_local_new_i32();
     if (ex) { /* swx */
         TCGv_i32 tval;
 
-        /* Force addr into the swx_addr. */
-        tcg_gen_mov_i32(swx_addr, *addr);
-        addr = &swx_addr;
         /* swx does not throw unaligned access errors, so force alignment */
-        tcg_gen_andi_i32(swx_addr, swx_addr, ~3);
+        tcg_gen_andi_i32(addr, addr, ~3);
 
         write_carryi(dc, 1);
         swx_skip = gen_new_label();
-        tcg_gen_brcond_i32(TCG_COND_NE, env_res_addr, swx_addr, swx_skip);
+        tcg_gen_brcond_i32(TCG_COND_NE, env_res_addr, addr, swx_skip);
 
         /* Compare the value loaded at lwx with current contents of
            the reserved location.
@@ -1081,8 +1059,8 @@ static void dec_store(DisasContext *dc)
            this compare and the following write to be atomic. For user
            emulation we need to add atomicity between threads.  */
         tval = tcg_temp_new_i32();
-        tcg_gen_qemu_ld_i32(tval, swx_addr, cpu_mmu_index(&dc->cpu->env, false),
-                           MO_TEUL);
+        tcg_gen_qemu_ld_i32(tval, addr, cpu_mmu_index(&dc->cpu->env, false),
+                            MO_TEUL);
         tcg_gen_brcond_i32(TCG_COND_NE, env_res_val, tval, swx_skip);
         write_carryi(dc, 0);
         tcg_temp_free_i32(tval);
@@ -1099,17 +1077,10 @@ static void dec_store(DisasContext *dc)
                    11 -> 00 */
                 TCGv_i32 low = tcg_temp_new_i32();
 
-                /* Force addr into the temp.  */
-                if (addr != &t) {
-                    t = tcg_temp_new_i32();
-                    tcg_gen_mov_i32(t, *addr);
-                    addr = &t;
-                }
-
-                tcg_gen_andi_i32(low, t, 3);
+                tcg_gen_andi_i32(low, addr, 3);
                 tcg_gen_sub_i32(low, tcg_const_i32(3), low);
-                tcg_gen_andi_i32(t, t, ~3);
-                tcg_gen_or_i32(t, t, low);
+                tcg_gen_andi_i32(addr, addr, ~3);
+                tcg_gen_or_i32(addr, addr, low);
                 tcg_temp_free_i32(low);
                 break;
             }
@@ -1118,20 +1089,14 @@ static void dec_store(DisasContext *dc)
                 /* 00 -> 10
                    10 -> 00.  */
                 /* Force addr into the temp.  */
-                if (addr != &t) {
-                    t = tcg_temp_new_i32();
-                    tcg_gen_xori_i32(t, *addr, 2);
-                    addr = &t;
-                } else {
-                    tcg_gen_xori_i32(t, t, 2);
-                }
+                tcg_gen_xori_i32(addr, addr, 2);
                 break;
             default:
                 cpu_abort(CPU(dc->cpu), "Invalid reverse size\n");
                 break;
         }
     }
-    tcg_gen_qemu_st_i32(cpu_R[dc->rd], *addr,
+    tcg_gen_qemu_st_i32(cpu_R[dc->rd], addr,
                         cpu_mmu_index(&dc->cpu->env, false), mop);
 
     /* Verify alignment if needed.  */
@@ -1143,17 +1108,15 @@ static void dec_store(DisasContext *dc)
          *        the alignment checks in between the probe and the mem
          *        access.
          */
-        gen_helper_memalign(cpu_env, *addr, tcg_const_i32(dc->rd),
+        gen_helper_memalign(cpu_env, addr, tcg_const_i32(dc->rd),
                             tcg_const_i32(1), tcg_const_i32(size - 1));
     }
 
     if (ex) {
         gen_set_label(swx_skip);
     }
-    tcg_temp_free_i32(swx_addr);
 
-    if (addr == &t)
-        tcg_temp_free_i32(t);
+    tcg_temp_free_i32(addr);
 }
 
 static inline void eval_cc(DisasContext *dc, unsigned int cc,
-- 
2.14.1