tcg/arm: Use atom_and_align_for_opc

No change to the ultimate load/store routines yet, so some atomicity
conditions not yet honored, but plumbs the change to alignment through
the relevant functions.

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

tcg/arm/tcg-target.c.inc

@@ -1323,6 +1323,7 @@ typedef struct {
     TCGReg base;
     int index;
     bool index_scratch;
+    TCGAtomAlign aa;
 } HostAddress;
 
 bool tcg_target_has_memory_bswap(MemOp memop)
@@ -1379,8 +1380,26 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
 {
     TCGLabelQemuLdst *ldst = NULL;
     MemOp opc = get_memop(oi);
-    MemOp a_bits = get_alignment_bits(opc);
-    unsigned a_mask = (1 << a_bits) - 1;
+    unsigned a_mask;
+
+#ifdef CONFIG_SOFTMMU
+    *h = (HostAddress){
+        .cond = COND_AL,
+        .base = addrlo,
+        .index = TCG_REG_R1,
+        .index_scratch = true,
+    };
+#else
+    *h = (HostAddress){
+        .cond = COND_AL,
+        .base = addrlo,
+        .index = guest_base ? TCG_REG_GUEST_BASE : -1,
+        .index_scratch = false,
+    };
+#endif
+
+    h->aa = atom_and_align_for_opc(s, opc, MO_ATOM_IFALIGN, false);
+    a_mask = (1 << h->aa.align) - 1;
 
 #ifdef CONFIG_SOFTMMU
     int mem_index = get_mmuidx(oi);
@@ -1469,13 +1488,6 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
     if (TARGET_LONG_BITS == 64) {
         tcg_out_dat_reg(s, COND_EQ, ARITH_CMP, 0, TCG_REG_R3, addrhi, 0);
     }
-
-    *h = (HostAddress){
-        .cond = COND_AL,
-        .base = addrlo,
-        .index = TCG_REG_R1,
-        .index_scratch = true,
-    };
 #else
     if (a_mask) {
         ldst = new_ldst_label(s);
@@ -1484,18 +1496,11 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
         ldst->addrlo_reg = addrlo;
         ldst->addrhi_reg = addrhi;
 
-        /* We are expecting a_bits to max out at 7 */
+        /* We are expecting alignment to max out at 7 */
         tcg_debug_assert(a_mask <= 0xff);
         /* tst addr, #mask */
         tcg_out_dat_imm(s, COND_AL, ARITH_TST, 0, addrlo, a_mask);
     }
-
-    *h = (HostAddress){
-        .cond = COND_AL,
-        .base = addrlo,
-        .index = guest_base ? TCG_REG_GUEST_BASE : -1,
-        .index_scratch = false,
-    };
 #endif
 
     return ldst;