third_party/llvm-7.0/llvm/test/CodeGen/X86/xray-empty-firstmbb.mir

# RUN: llc -run-pass xray-instrumentation -mtriple=x86_64-unknown-linux-gnu -o - %s | FileCheck %s
#
# Make sure we can handle empty first basic blocks.

--- |

  define i32 @foo() noinline uwtable "xray-instruction-threshold"="1" {
  entry:
    unreachable
  }

...

---
name: foo
tracksRegLiveness: true
liveins:
  - { reg: '$edi'}
body:            |
  bb.0.entry:
    liveins: $edi
    ; CHECK-NOT: PATCHABLE_FUNCTION_ENTER
...