forked from OSchip/llvm-project
37 lines
1.0 KiB
LLVM
37 lines
1.0 KiB
LLVM
; RUN: opt < %s -lowerswitch -S | FileCheck %s
|
|
|
|
; This test verifies -lowerswitch does not crash when an removing an
|
|
; unreachable default branch causes a PHI node used as the switch
|
|
; condition to be erased.
|
|
|
|
define void @f() local_unnamed_addr {
|
|
entry:
|
|
br label %sw.epilog
|
|
|
|
sw.epilog: ; preds = %sw.epilog.outer, %for.body
|
|
%i = phi i32 [ undef, %for.body ], [ 0, %entry ]
|
|
br i1 undef, label %for.body, label %for.end
|
|
|
|
for.body: ; preds = %sw.epilog
|
|
switch i32 %i, label %sw.epilog [
|
|
i32 0, label %sw.epilog.outer.backedge.loopexit
|
|
i32 1, label %sw.epilog.outer.backedge
|
|
]
|
|
|
|
sw.epilog.outer.backedge.loopexit: ; preds = %for.body
|
|
br label %for.end
|
|
|
|
sw.epilog.outer.backedge: ; preds = %for.body
|
|
unreachable
|
|
|
|
for.end: ; preds = %sw.epilog
|
|
ret void
|
|
}
|
|
|
|
; The phi and the switch should both be eliminated.
|
|
; CHECK: @f()
|
|
; CHECK: sw.epilog:
|
|
; CHECK-NOT: phi
|
|
; CHECK: for.body:
|
|
; CHECK-NOT: switch
|