| ; 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 | |
| } |