[(set GR64:$dst, (zextloadi64i32 addr:$src))]>;
-// Alias instructions that map movr0 to xor.
+// Alias instructions that map movr0 to xor. Use xorl instead of xorq; it's
+// equivalent due to implicit zero-extending, and it sometimes has a smaller
+// encoding.
// FIXME: remove when we can teach regalloc that xor reg, reg is ok.
// FIXME: AddedComplexity gives MOV64r0 a higher priority than MOV64ri32. Remove
// when we have a better way to specify isel priority.
let Defs = [EFLAGS], AddedComplexity = 1, isReMaterializable = 1 in
def MOV64r0 : RI<0x31, MRMInitReg, (outs GR64:$dst), (ins),
- "xor{q}\t$dst, $dst",
+ "xor{l}\t${dst:subreg32}, ${dst:subreg32}",
[(set GR64:$dst, 0)]>;
// Materialize i64 constant where top 32-bits are zero.