1; RUN: llc < %s -O2 -march=x86-64 | FileCheck %s 2; Checks that a zeroing mov is inserted for the trunc/zext pair even when 3; the source of the zext is an AssertSext node 4; PR20494 5 6define i64 @main(i64 %a) { 7; CHECK-LABEL: main 8; CHECK: movl %e{{..}}, %eax 9; CHECK: ret 10 %or = or i64 %a, -2 11 %trunc = trunc i64 %or to i32 12 br label %l 13l: 14 %ext = zext i32 %trunc to i64 15 ret i64 %ext 16} 17