third_party/llvm-7.0/llvm/test/CodeGen/AArch64/GlobalISel/combine-anyext-crash.mir

# RUN: llc -O0 -run-pass=legalizer %s -o - | FileCheck %s
--- |
  target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64--"
  
  define void @test_anyext_crash() {
  entry:
    br label %block2
  
  block2:
    %0 = trunc i16 0 to i8
    %1 = uitofp i8 %0 to double
    br label %block2
  }
  

...
---
name:            test_anyext_crash
alignment:       2
legalized:       false
registers:       
  - { id: 0, class: _, preferred-register: '' }
  - { id: 1, class: _, preferred-register: '' }
  - { id: 2, class: _, preferred-register: '' }
body:             |
  bb.1:
   ; Check we don't crash due to trying to legalize a dead instruction.
   ; CHECK-LABEL: test_anyext_crash
   ; CHECK-LABEL: bb.1:
    successors: %bb.2
  
    %0(s16) = G_CONSTANT i16 0
  
  bb.2:
    successors: %bb.2
  
    %1(s8) = G_TRUNC %0(s16)
    %2(s64) = G_UITOFP %1(s8)
    G_BR %bb.2

...