test/Transforms/NewGVN/phi-edge-handling.ll

   1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
   2 ; RUN: opt < %s -newgvn -S | FileCheck %s
   3
   4
   5 ;; Block 6 is reachable, but edge 6->4 is not
   6 ;; This means the phi value is undef, not 0
   7 ; Function Attrs: ssp uwtable
   8 define i16 @hoge() local_unnamed_addr #0 align 2 {
   9 ; CHECK-LABEL: @hoge(
  10 ; CHECK-NEXT:  bb:
  11 ; CHECK-NEXT:    switch i8 undef, label [[BB7:%.*]] [
  12 ; CHECK-NEXT:    i8 0, label [[BB1:%.*]]
  13 ; CHECK-NEXT:    i8 12, label [[BB2:%.*]]
  14 ; CHECK-NEXT:    ]
  15 ; CHECK:       bb1:
  16 ; CHECK-NEXT:    br label [[BB6:%.*]]
  17 ; CHECK:       bb2:
  18 ; CHECK-NEXT:    br label [[BB4:%.*]]
  19 ; CHECK:       bb3:
  20 ; CHECK-NEXT:    unreachable
  21 ; CHECK:       bb4:
  22 ; CHECK-NEXT:    ret i16 undef
  23 ; CHECK:       bb6:
  24 ; CHECK-NEXT:    br i1 true, label [[BB3:%.*]], label [[BB4]], !llvm.loop !1
  25 ; CHECK:       bb7:
  26 ; CHECK-NEXT:    unreachable
  27 ;
  28 bb:
  29   switch i8 undef, label %bb7 [
  30   i8 0, label %bb1
  31   i8 12, label %bb2
  32   ]
  33
  34 bb1:                                              ; preds = %bb
  35   br label %bb6
  36
  37 bb2:                                              ; preds = %bb
  38   br label %bb4
  39
  40 bb3:                                              ; preds = %bb6
  41   unreachable
  42
  43 bb4:                                              ; preds = %bb6, %bb2
  44   %tmp = phi i16 [ 0, %bb6 ], [ undef, %bb2 ]
  45   ret i16 %tmp
  46
  47 bb6:                                              ; preds = %bb4
  48   br i1 true, label %bb3, label %bb4, !llvm.loop !1
  49
  50 bb7:                                              ; preds = %bb
  51   unreachable
  52 }
  53
  54 attributes #0 = { ssp uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
  55
  56 !llvm.ident = !{!0}
  57
  58 !0 = !{!"clang version 5.0.0"}
  59 !1 = distinct !{!1, !2}
  60 !2 = !{!"llvm.loop.unroll.disable"}