Split out of mmu_lookup.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/exec/memop.h | 24 ++++++++++++++++++++++++
 accel/tcg/cputlb.c   | 16 ++--------------
 2 files changed, 26 insertions(+), 14 deletions(-)

diff --git a/include/exec/memop.h b/include/exec/memop.h
index f53bf618c6..b699bf7688 100644
--- a/include/exec/memop.h
+++ b/include/exec/memop.h
@@ -193,4 +193,28 @@ static inline unsigned memop_alignment_bits(MemOp memop)
     return a;
 }
 
+/*
+ * memop_atomicity_bits:
+ * @memop: MemOp value
+ *
+ * Extract the atomicity size from the memop.
+ */
+static inline unsigned memop_atomicity_bits(MemOp memop)
+{
+    unsigned size = memop & MO_SIZE;
+
+    switch (memop & MO_ATOM_MASK) {
+    case MO_ATOM_NONE:
+        size = MO_8;
+        break;
+    case MO_ATOM_IFALIGN_PAIR:
+    case MO_ATOM_WITHIN16_PAIR:
+        size = size ? size - 1 : 0;
+        break;
+    default:
+        break;
+    }
+    return size;
+}
+
 #endif
diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index b5bff220a3..f5fca5a118 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -1751,20 +1751,8 @@ static bool mmu_lookup(CPUState *cpu, vaddr addr, MemOpIdx oi,
      * Device memory type require alignment.
      */
     if (unlikely(flags & TLB_CHECK_ALIGNED)) {
-        MemOp size = l->memop & MO_SIZE;
-
-        switch (l->memop & MO_ATOM_MASK) {
-        case MO_ATOM_NONE:
-            size = MO_8;
-            break;
-        case MO_ATOM_IFALIGN_PAIR:
-        case MO_ATOM_WITHIN16_PAIR:
-            size = size ? size - 1 : 0;
-            break;
-        default:
-            break;
-        }
-        if (addr & ((1 << size) - 1)) {
+        a_bits = memop_atomicity_bits(l->memop);
+        if (addr & ((1 << a_bits) - 1)) {
             cpu_unaligned_access(cpu, addr, type, l->mmu_idx, ra);
         }
     }
-- 
2.43.0