; RUN: opt -passes=lower-switch -S < %s | FileCheck %s
; Test that we don't crash and have a different basic block for each incoming edge.
define void @test0(i32 %mode) {
; CHECK-LABEL: @test0
;
; CHECK: icmp eq i32 %mode, 4
; CHECK-NEXT: label %BB3, label %BB2
;
; CHECK: icmp eq i32 %mode, 2
; CHECK-NEXT: label %BB3, label %BB2
;
; CHECK: icmp eq i32 %mode, 0
; CHECK-NEXT: label %BB3, label %BB2
;
; CHECK: %merge = phi i64 [ 1, %BB3 ], [ 0, %LeafBlock ], [ 0, %LeafBlock1 ], [ 0, %LeafBlock3 ]
BB1:
switch i32 %mode, label %BB2 [
i32 3, label %BB2
i32 5, label %BB2
i32 0, label %BB3
i32 2, label %BB3
i32 4, label %BB3
]
BB2:
%merge = phi i64 [ 1, %BB3 ], [ 0, %BB1 ], [ 0, %BB1 ], [ 0, %BB1 ]
ret void
BB3:
br label %BB2
}
; Test switch cases that are merged into a single case during lower-switch
; (take 84 and 85 below) - check that the number of incoming phi values match
; the number of branches.
define void @test1(i32 %mode) {
; CHECK-LABEL: @test1
entry:
br label %bb1
bb1:
switch i32 %mode, label %bb1 [
i32 84, label %bb3
i32 85, label %bb3
i32 86, label %bb2
i32 78, label %exit
i32 99, label %bb3
]
bb2:
br label %bb3
bb3:
; CHECK-LABEL: bb3
; CHECK: %tmp = phi i32 [ 1, %NodeBlock ], [ 0, %bb2 ], [ 1, %LeafBlock3 ]
%tmp = phi i32 [ 1, %bb1 ], [ 0, %bb2 ], [ 1, %bb1 ], [ 1, %bb1 ]
; CHECK-NEXT: %tmp2 = phi i32 [ 2, %NodeBlock ], [ 5, %bb2 ], [ 2, %LeafBlock3 ]
%tmp2 = phi i32 [ 2, %bb1 ], [ 2, %bb1 ], [ 5, %bb2 ], [ 2, %bb1 ]
br label %exit
exit:
ret void
}
; Test that we don't crash.
define void @test2(i32 %mode, i1 %c1, i1 %c2, i1 %c3, i1 %c4, i1 %c5, i1 %c6) {
; CHECK-LABEL: @test2
br i1 %c1, label %1, label %._crit_edge
; <label>:1 ; preds = %0
switch i32 %mode, label %33 [
i32 2, label %2
i32 3, label %3
i32 4, label %4
i32 5, label %5
i32 6, label %6
i32 7, label %7
i32 8, label %8
i32 9, label %9
i32 10, label %10
i32 11, label %14
i32 12, label %18
i32 13, label %22
i32 14, label %26
i32 15, label %27
i32 16, label %34
i32 17, label %34
i32 18, label %34
i32 19, label %34
i32 22, label %34
i32 20, label %31
i32 21, label %32
]
; <label>:2 ; preds = %1
br label %34
; <label>:3 ; preds = %1
br label %34
; <label>:4 ; preds = %1
br label %34
; <label>:5 ; preds = %1
br label %34
; <label>:6 ; preds = %1
br label %34
; <label>:7 ; preds = %1
br label %34
; <label>:8 ; preds = %1
br label %34
; <label>:9 ; preds = %1
br label %34
; <label>:10 ; preds = %1
br i1 %c2, label %11, label %12
; <label>:11 ; preds = %10
br label %13
; <label>:12 ; preds = %10
br label %13
; <label>:13 ; preds = %12, %11
br label %34
; <label>:14 ; preds = %1
br i1 %c3, label %15, label %16
; <label>:15 ; preds = %14
br label %17
; <label>:16 ; preds = %14
br label %17
; <label>:17 ; preds = %16, %15
br label %34
; <label>:18 ; preds = %1
br i1 %c4, label %19, label %20
; <label>:19 ; preds = %18
br label %21
; <label>:20 ; preds = %18
br label %21
; <label>:21 ; preds = %20, %19
br label %34
; <label>:22 ; preds = %1
br i1 %c5, label %23, label %24
; <label>:23 ; preds = %22
br label %25
; <label>:24 ; preds = %22
br label %25
; <label>:25 ; preds = %24, %23
br label %34
; <label>:26 ; preds = %1
br label %34
; <label>:27 ; preds = %1
br i1 %c6, label %28, label %29
; <label>:28 ; preds = %27
br label %30
; <label>:29 ; preds = %27
br label %30
; <label>:30 ; preds = %29, %28
br label %34
; <label>:31 ; preds = %1
br label %34
; <label>:32 ; preds = %1
br label %34
; <label>:33 ; preds = %1
br label %34
; <label>:34 ; preds = %33, %32, %31, %30, %26, %25, %21, %17, %13, %9, %8, %7, %6, %5, %4, %3, %2, %1, %1, %1, %1, %1
%o.0 = phi float [ undef, %33 ], [ undef, %32 ], [ undef, %31 ], [ undef, %30 ], [ undef, %26 ], [ undef, %25 ], [ undef, %21 ], [ undef, %17 ], [ undef, %13 ], [ undef, %9 ], [ undef, %8 ], [ undef, %7 ], [ undef, %6 ], [ undef, %5 ], [ undef, %4 ], [ undef, %3 ], [ undef, %2 ], [ undef, %1 ], [ undef, %1 ], [ undef, %1 ], [ undef, %1 ], [ undef, %1 ]
br label %._crit_edge
._crit_edge: ; preds = %34, %0
ret void
}
; Test that the PHI node in for.cond should have one entry for each predecessor
; of its parent basic block after lower-switch merged several cases into a new
; default block.
define void @test3(i32 %mode, i1 %c1, i1 %c2) {
; CHECK-LABEL: @test3
entry:
br label %lbl1
lbl1: ; preds = %cleanup, %entry
br label %lbl2
lbl2: ; preds = %cleanup, %lbl1
br label %for.cond
for.cond: ; preds = %cleanup, %cleanup, %lbl2
; CHECK: for.cond:
; CHECK: phi i16 [ undef, %lbl2 ], [ %b.3, %LeafBlock ], [ %b.3, %LeafBlock1 ]{{$}}
; CHECK: for.cond1:
%b.2 = phi i16 [ undef, %lbl2 ], [ %b.3, %cleanup ], [ %b.3, %cleanup ]
br label %for.cond1
for.cond1: ; preds = %for.inc, %for.cond
%b.3 = phi i16 [ %b.2, %for.cond ], [ undef, %for.inc ]
%tobool = icmp ne i16 %b.3, 0
br i1 %tobool, label %for.body, label %for.end
for.body: ; preds = %for.cond1
br i1 %c1, label %if.then, label %for.inc
if.then: ; preds = %for.body
br label %cleanup
for.inc: ; preds = %for.body
br label %for.cond1
for.end: ; preds = %for.cond1
br i1 %c2, label %if.then4, label %for.body7
if.then4: ; preds = %for.end
br label %cleanup
for.body7: ; preds = %for.end
br label %cleanup
cleanup: ; preds = %for.body7, %if.then4, %if.then
switch i32 %mode, label %unreachable [
i32 0, label %for.cond
i32 2, label %lbl1
i32 5, label %for.cond
i32 3, label %lbl2
]
unreachable: ; preds = %cleanup
unreachable
}
; Test that the PHI node in cleanup17 is removed as the switch default block is
; not reachable.
define void @test4(i32 %mode) {
; CHECK-LABEL: @test4
entry:
switch i32 %mode, label %cleanup17 [
i32 0, label %return
i32 9, label %return
]
cleanup17:
; CHECK: cleanup17:
; CHECK-NOT: phi i16 [ undef, %entry ]
; CHECK: return:
%retval.4 = phi i16 [ undef, %entry ]
unreachable
return:
ret void
}
; Test that the PHI node in for.inc is updated correctly as the switch is
; replaced with a single branch to for.inc
define void @test5(i32 %mode, i1 %c1) {
; CHECK-LABEL: @test5
entry:
br i1 %c1, label %cleanup10, label %cleanup10.thread
cleanup10.thread:
br label %for.inc
cleanup10:
switch i32 %mode, label %unreachable [
i32 0, label %for.inc
i32 4, label %for.inc
]
for.inc:
; CHECK: for.inc:
; CHECK-NEXT: phi i16 [ 0, %cleanup10.thread ], [ undef, %cleanup10 ]
%0 = phi i16 [ undef, %cleanup10 ], [ 0, %cleanup10.thread ], [ undef, %cleanup10 ]
unreachable
unreachable:
unreachable
}
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