1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc < %s -O2 -mtriple=x86_64-unknown-unknown | FileCheck %s 3; Checks that a zeroing mov is inserted for the trunc/zext pair even when 4; the source of the zext is an AssertSext node 5; PR20494 6 7define i64 @main(i64 %a) { 8; CHECK-LABEL: main: 9; CHECK: # %bb.0: 10; CHECK-NEXT: orq $-2, %rdi 11; CHECK-NEXT: movl %edi, %eax 12; CHECK-NEXT: retq 13 %or = or i64 %a, -2 14 %trunc = trunc i64 %or to i32 15 br label %l 16l: 17 %ext = zext i32 %trunc to i64 18 trunc i64 %or to i32 ; to keep the or from being narrowed 19 ret i64 %ext 20} 21