; RUN: llc < %s
; PR1763
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
target triple = "x86_64-unknown-linux-gnu"

define void @yield() {
        %tmp9 = call i64 asm sideeffect "xchgb ${0:b},$1", "=q,*m,0,~{dirflag},~{fpsr},~{flags},~{memory}"( i64* null, i64 0 )   ; <i64>
        ret void
}