llvm/llvm/test/CodeGen/X86/codegen-prepare-replacephi.mir

# RUN: llc -run-pass=codegenprepare -o - %s | FileCheck %s

# REQUIRES: default_triple

# This testcase without the accompanying fix triggers the assert
# "Replacement PHI node is already replaced."

--- |
  define void @f1() {
  entry:
    %arrayidx = getelementptr inbounds [2 x i16], ptr undef, i16 0, i16 2
    br label %for.cond

  for.cond:
    %0 = phi ptr [ %arrayidx, %entry ], [ %5, %cleanup ]
    %1 = phi ptr [ %arrayidx, %entry ], [ %7, %cleanup ]
    br label %for.body

  for.body:
    %2 = phi ptr [ %1, %for.cond ], [ %7, %cleanup ]
    %3 = phi ptr [ %0, %for.cond ], [ %7, %cleanup ]
    %4 = phi ptr [ %0, %for.cond ], [ %7, %cleanup ]
    br i1 false, label %for.cond2, label %if.then

  if.then:
    store i32 undef, ptr %2, align 1
    unreachable

  for.cond2:
    %5 = phi ptr [ %4, %for.body ], [ %5, %if.then5 ], [ undef, %for.cond2 ]
    %6 = phi ptr [ %3, %for.body ], [ %6, %if.then5 ], [ undef, %for.cond2 ]
    %7 = phi ptr [ %2, %for.body ], [ %6, %if.then5 ], [ undef, %for.cond2 ]
    br i1 undef, label %for.cond2, label %if.then5

  if.then5:
    br i1 undef, label %cleanup, label %for.cond2

  cleanup:
    br i1 true, label %for.cond, label %for.body
  }

...

# A check to verify that something got through.
# CHECK-LABEL: entry: