typedef struct {
TCGReg base;
TCGReg index;
+ TCGAtomAlign aa;
} HostAddress;
bool tcg_target_has_memory_bswap(MemOp memop)
{
TCGLabelQemuLdst *ldst = NULL;
MemOp opc = get_memop(oi);
- unsigned a_bits = get_alignment_bits(opc);
+ MemOp a_bits;
+
+ /*
+ * Book II, Section 1.4, Single-Copy Atomicity, specifies:
+ *
+ * Before 3.0, "An access that is not atomic is performed as a set of
+ * smaller disjoint atomic accesses. In general, the number and alignment
+ * of these accesses are implementation-dependent." Thus MO_ATOM_IFALIGN.
+ *
+ * As of 3.0, "the non-atomic access is performed as described in
+ * the corresponding list", which matches MO_ATOM_SUBALIGN.
+ */
+ h->aa = atom_and_align_for_opc(s, opc,
+ have_isa_3_00 ? MO_ATOM_SUBALIGN
+ : MO_ATOM_IFALIGN,
+ false);
+ a_bits = h->aa.align;
#ifdef CONFIG_SOFTMMU
int mem_index = get_mmuidx(oi);