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