; RUN: opt < %s -simplifycfg -S | FileCheck %s
declare void @foo1()
declare void @foo2()
define void @test1(i32 %V) {
%C1 = icmp eq i32 %V, 4 ; <i1> [#uses=1]
%C2 = icmp eq i32 %V, 17 ; <i1> [#uses=1]
%CN = or i1 %C1, %C2 ; <i1> [#uses=1]
br i1 %CN, label %T, label %F
T: ; preds = %0
call void @foo1( )
ret void
F: ; preds = %0
call void @foo2( )
ret void
; CHECK: @test1
; CHECK: switch i32 %V, label %F [
; CHECK: i32 17, label %T
; CHECK: i32 4, label %T
; CHECK: ]
}
define void @test2(i32 %V) {
%C1 = icmp ne i32 %V, 4 ; <i1> [#uses=1]
%C2 = icmp ne i32 %V, 17 ; <i1> [#uses=1]
%CN = and i1 %C1, %C2 ; <i1> [#uses=1]
br i1 %CN, label %T, label %F
T: ; preds = %0
call void @foo1( )
ret void
F: ; preds = %0
call void @foo2( )
ret void
; CHECK: @test2
; CHECK: switch i32 %V, label %T [
; CHECK: i32 17, label %F
; CHECK: i32 4, label %F
; CHECK: ]
}
define void @test3(i32 %V) {
%C1 = icmp eq i32 %V, 4 ; <i1> [#uses=1]
br i1 %C1, label %T, label %N
N: ; preds = %0
%C2 = icmp eq i32 %V, 17 ; <i1> [#uses=1]
br i1 %C2, label %T, label %F
T: ; preds = %N, %0
call void @foo1( )
ret void
F: ; preds = %N
call void @foo2( )
ret void
; CHECK: @test3
; CHECK: switch i32 %V, label %F [
; CHECK: i32 4, label %T
; CHECK: i32 17, label %T
; CHECK: ]
}
define i32 @test4(i8 zeroext %c) nounwind ssp noredzone {
entry:
%cmp = icmp eq i8 %c, 62
br i1 %cmp, label %lor.end, label %lor.lhs.false
lor.lhs.false: ; preds = %entry
%cmp4 = icmp eq i8 %c, 34
br i1 %cmp4, label %lor.end, label %lor.rhs
lor.rhs: ; preds = %lor.lhs.false
%cmp8 = icmp eq i8 %c, 92
br label %lor.end
lor.end: ; preds = %lor.rhs, %lor.lhs.false, %entry
%0 = phi i1 [ true, %lor.lhs.false ], [ true, %entry ], [ %cmp8, %lor.rhs ]
%lor.ext = zext i1 %0 to i32
ret i32 %lor.ext
; CHECK: @test4
; CHECK: switch i8 %c, label %lor.rhs [
; CHECK: i8 62, label %lor.end
; CHECK: i8 34, label %lor.end
; CHECK: i8 92, label %lor.end
; CHECK: ]
}
define i32 @test5(i8 zeroext %c) nounwind ssp noredzone {
entry:
switch i8 %c, label %lor.rhs [
i8 62, label %lor.end
i8 34, label %lor.end
i8 92, label %lor.end
]
lor.rhs: ; preds = %entry
%V = icmp eq i8 %c, 92
br label %lor.end
lor.end: ; preds = %entry, %entry, %entry, %lor.rhs
%0 = phi i1 [ true, %entry ], [ %V, %lor.rhs ], [ true, %entry ], [ true, %entry ]
%lor.ext = zext i1 %0 to i32
ret i32 %lor.ext
; CHECK: @test5
; CHECK: switch i8 %c, label %lor.rhs [
; CHECK: i8 62, label %lor.end
; CHECK: i8 34, label %lor.end
; CHECK: i8 92, label %lor.end
; CHECK: ]
}
define i1 @test6({ i32, i32 }* %I) {
entry:
%tmp.1.i = getelementptr { i32, i32 }* %I, i64 0, i32 1 ; <i32*> [#uses=1]
%tmp.2.i = load i32* %tmp.1.i ; <i32> [#uses=6]
%tmp.2 = icmp eq i32 %tmp.2.i, 14 ; <i1> [#uses=1]
br i1 %tmp.2, label %shortcirc_done.4, label %shortcirc_next.0
shortcirc_next.0: ; preds = %entry
%tmp.6 = icmp eq i32 %tmp.2.i, 15 ; <i1> [#uses=1]
br i1 %tmp.6, label %shortcirc_done.4, label %shortcirc_next.1
shortcirc_next.1: ; preds = %shortcirc_next.0
%tmp.11 = icmp eq i32 %tmp.2.i, 16 ; <i1> [#uses=1]
br i1 %tmp.11, label %shortcirc_done.4, label %shortcirc_next.2
shortcirc_next.2: ; preds = %shortcirc_next.1
%tmp.16 = icmp eq i32 %tmp.2.i, 17 ; <i1> [#uses=1]
br i1 %tmp.16, label %shortcirc_done.4, label %shortcirc_next.3
shortcirc_next.3: ; preds = %shortcirc_next.2
%tmp.21 = icmp eq i32 %tmp.2.i, 18 ; <i1> [#uses=1]
br i1 %tmp.21, label %shortcirc_done.4, label %shortcirc_next.4
shortcirc_next.4: ; preds = %shortcirc_next.3
%tmp.26 = icmp eq i32 %tmp.2.i, 19 ; <i1> [#uses=1]
br label %UnifiedReturnBlock
shortcirc_done.4: ; preds = %shortcirc_next.3, %shortcirc_next.2, %shortcirc_next.1, %shortcirc_next.0, %entry
br label %UnifiedReturnBlock
UnifiedReturnBlock: ; preds = %shortcirc_done.4, %shortcirc_next.4
%UnifiedRetVal = phi i1 [ %tmp.26, %shortcirc_next.4 ], [ true, %shortcirc_done.4 ] ; <i1> [#uses=1]
ret i1 %UnifiedRetVal
; CHECK: @test6
; CHECK: %switch.tableidx = sub i32 %tmp.2.i, 14
; CHECK: %0 = icmp ult i32 %switch.tableidx, 6
; CHECK: select i1 %0, i1 true, i1 false
}
define void @test7(i8 zeroext %c, i32 %x) nounwind ssp noredzone {
entry:
%cmp = icmp ult i32 %x, 32
%cmp4 = icmp eq i8 %c, 97
%or.cond = or i1 %cmp, %cmp4
%cmp9 = icmp eq i8 %c, 99
%or.cond11 = or i1 %or.cond, %cmp9
br i1 %or.cond11, label %if.then, label %if.end
if.then: ; preds = %entry
tail call void @foo1() nounwind noredzone
ret void
if.end: ; preds = %entry
ret void
; CHECK: @test7
; CHECK: %cmp = icmp ult i32 %x, 32
; CHECK: br i1 %cmp, label %if.then, label %switch.early.test
; CHECK: switch.early.test:
; CHECK: switch i8 %c, label %if.end [
; CHECK: i8 99, label %if.then
; CHECK: i8 97, label %if.then
; CHECK: ]
}
define i32 @test8(i8 zeroext %c, i32 %x, i1 %C) nounwind ssp noredzone {
entry:
br i1 %C, label %N, label %if.then
N:
%cmp = icmp ult i32 %x, 32
%cmp4 = icmp eq i8 %c, 97
%or.cond = or i1 %cmp, %cmp4
%cmp9 = icmp eq i8 %c, 99
%or.cond11 = or i1 %or.cond, %cmp9
br i1 %or.cond11, label %if.then, label %if.end
if.then: ; preds = %entry
%A = phi i32 [0, %entry], [42, %N]
tail call void @foo1() nounwind noredzone
ret i32 %A
if.end: ; preds = %entry
ret i32 0
; CHECK: @test8
; CHECK: switch.early.test:
; CHECK: switch i8 %c, label %if.end [
; CHECK: i8 99, label %if.then
; CHECK: i8 97, label %if.then
; CHECK: ]
; CHECK: %A = phi i32 [ 0, %entry ], [ 42, %switch.early.test ], [ 42, %N ], [ 42, %switch.early.test ]
}
;; This is "Example 7" from http://blog.regehr.org/archives/320
define i32 @test9(i8 zeroext %c) nounwind ssp noredzone {
entry:
%cmp = icmp ult i8 %c, 33
br i1 %cmp, label %lor.end, label %lor.lhs.false
lor.lhs.false: ; preds = %entry
%cmp4 = icmp eq i8 %c, 46
br i1 %cmp4, label %lor.end, label %lor.lhs.false6
lor.lhs.false6: ; preds = %lor.lhs.false
%cmp9 = icmp eq i8 %c, 44
br i1 %cmp9, label %lor.end, label %lor.lhs.false11
lor.lhs.false11: ; preds = %lor.lhs.false6
%cmp14 = icmp eq i8 %c, 58
br i1 %cmp14, label %lor.end, label %lor.lhs.false16
lor.lhs.false16: ; preds = %lor.lhs.false11
%cmp19 = icmp eq i8 %c, 59
br i1 %cmp19, label %lor.end, label %lor.lhs.false21
lor.lhs.false21: ; preds = %lor.lhs.false16
%cmp24 = icmp eq i8 %c, 60
br i1 %cmp24, label %lor.end, label %lor.lhs.false26
lor.lhs.false26: ; preds = %lor.lhs.false21
%cmp29 = icmp eq i8 %c, 62
br i1 %cmp29, label %lor.end, label %lor.lhs.false31
lor.lhs.false31: ; preds = %lor.lhs.false26
%cmp34 = icmp eq i8 %c, 34
br i1 %cmp34, label %lor.end, label %lor.lhs.false36
lor.lhs.false36: ; preds = %lor.lhs.false31
%cmp39 = icmp eq i8 %c, 92
br i1 %cmp39, label %lor.end, label %lor.rhs
lor.rhs: ; preds = %lor.lhs.false36
%cmp43 = icmp eq i8 %c, 39
br label %lor.end
lor.end: ; preds = %lor.rhs, %lor.lhs.false36, %lor.lhs.false31, %lor.lhs.false26, %lor.lhs.false21, %lor.lhs.false16, %lor.lhs.false11, %lor.lhs.false6, %lor.lhs.false, %entry
%0 = phi i1 [ true, %lor.lhs.false36 ], [ true, %lor.lhs.false31 ], [ true, %lor.lhs.false26 ], [ true, %lor.lhs.false21 ], [ true, %lor.lhs.false16 ], [ true, %lor.lhs.false11 ], [ true, %lor.lhs.false6 ], [ true, %lor.lhs.false ], [ true, %entry ], [ %cmp43, %lor.rhs ]
%conv46 = zext i1 %0 to i32
ret i32 %conv46
; CHECK: @test9
; CHECK: %cmp = icmp ult i8 %c, 33
; CHECK: br i1 %cmp, label %lor.end, label %switch.early.test
; CHECK: switch.early.test:
; CHECK: switch i8 %c, label %lor.rhs [
; CHECK: i8 92, label %lor.end
; CHECK: i8 62, label %lor.end
; CHECK: i8 60, label %lor.end
; CHECK: i8 59, label %lor.end
; CHECK: i8 58, label %lor.end
; CHECK: i8 46, label %lor.end
; CHECK: i8 44, label %lor.end
; CHECK: i8 34, label %lor.end
; CHECK: i8 39, label %lor.end
; CHECK: ]
}
define i32 @test10(i32 %mode, i1 %Cond) {
%A = icmp ne i32 %mode, 0
%B = icmp ne i32 %mode, 51
%C = and i1 %A, %B
%D = and i1 %C, %Cond
br i1 %D, label %T, label %F
T:
ret i32 123
F:
ret i32 324
; CHECK: @test10
; CHECK: br i1 %Cond, label %switch.early.test, label %F
; CHECK:switch.early.test:
; CHECK: switch i32 %mode, label %T [
; CHECK: i32 51, label %F
; CHECK: i32 0, label %F
; CHECK: ]
}
; PR8780
define i32 @test11(i32 %bar) nounwind {
entry:
%cmp = icmp eq i32 %bar, 4
%cmp2 = icmp eq i32 %bar, 35
%or.cond = or i1 %cmp, %cmp2
%cmp5 = icmp eq i32 %bar, 53
%or.cond1 = or i1 %or.cond, %cmp5
%cmp8 = icmp eq i32 %bar, 24
%or.cond2 = or i1 %or.cond1, %cmp8
%cmp11 = icmp eq i32 %bar, 23
%or.cond3 = or i1 %or.cond2, %cmp11
%cmp14 = icmp eq i32 %bar, 55
%or.cond4 = or i1 %or.cond3, %cmp14
%cmp17 = icmp eq i32 %bar, 12
%or.cond5 = or i1 %or.cond4, %cmp17
%cmp20 = icmp eq i32 %bar, 35
%or.cond6 = or i1 %or.cond5, %cmp20
br i1 %or.cond6, label %if.then, label %if.end
if.then: ; preds = %entry
br label %return
if.end: ; preds = %entry
br label %return
return: ; preds = %if.end, %if.then
%retval.0 = phi i32 [ 1, %if.then ], [ 0, %if.end ]
ret i32 %retval.0
; CHECK: @test11
; CHECK: switch i32 %bar, label %if.end [
; CHECK: i32 55, label %return
; CHECK: i32 53, label %return
; CHECK: i32 35, label %return
; CHECK: i32 24, label %return
; CHECK: i32 23, label %return
; CHECK: i32 12, label %return
; CHECK: i32 4, label %return
; CHECK: ]
}
define void @test12() nounwind {
entry:
br label %bb49.us.us
bb49.us.us:
%A = icmp eq i32 undef, undef
br i1 %A, label %bb55.us.us, label %malformed
bb48.us.us:
%B = icmp ugt i32 undef, undef
br i1 %B, label %bb55.us.us, label %bb49.us.us
bb55.us.us:
br label %bb48.us.us
malformed:
ret void
; CHECK: @test12
}
; test13 - handle switch formation with ult.
define void @test13(i32 %x) nounwind ssp noredzone {
entry:
%cmp = icmp ult i32 %x, 2
br i1 %cmp, label %if.then, label %lor.lhs.false3
lor.lhs.false3: ; preds = %lor.lhs.false
%cmp5 = icmp eq i32 %x, 3
br i1 %cmp5, label %if.then, label %lor.lhs.false6
lor.lhs.false6: ; preds = %lor.lhs.false3
%cmp8 = icmp eq i32 %x, 4
br i1 %cmp8, label %if.then, label %lor.lhs.false9
lor.lhs.false9: ; preds = %lor.lhs.false6
%cmp11 = icmp eq i32 %x, 6
br i1 %cmp11, label %if.then, label %if.end
if.then: ; preds = %lor.lhs.false9, %lor.lhs.false6, %lor.lhs.false3, %lor.lhs.false, %entry
call void @foo1() noredzone
br label %if.end
if.end: ; preds = %if.then, %lor.lhs.false9
ret void
; CHECK: @test13
; CHECK: switch i32 %x, label %if.end [
; CHECK: i32 6, label %if.then
; CHECK: i32 4, label %if.then
; CHECK: i32 3, label %if.then
; CHECK: i32 1, label %if.then
; CHECK: i32 0, label %if.then
; CHECK: ]
}
; test14 - handle switch formation with ult.
define void @test14(i32 %x) nounwind ssp noredzone {
entry:
%cmp = icmp ugt i32 %x, 2
br i1 %cmp, label %lor.lhs.false3, label %if.then
lor.lhs.false3: ; preds = %lor.lhs.false
%cmp5 = icmp ne i32 %x, 3
br i1 %cmp5, label %lor.lhs.false6, label %if.then
lor.lhs.false6: ; preds = %lor.lhs.false3
%cmp8 = icmp ne i32 %x, 4
br i1 %cmp8, label %lor.lhs.false9, label %if.then
lor.lhs.false9: ; preds = %lor.lhs.false6
%cmp11 = icmp ne i32 %x, 6
br i1 %cmp11, label %if.end, label %if.then
if.then: ; preds = %lor.lhs.false9, %lor.lhs.false6, %lor.lhs.false3, %lor.lhs.false, %entry
call void @foo1() noredzone
br label %if.end
if.end: ; preds = %if.then, %lor.lhs.false9
ret void
; CHECK: @test14
; CHECK: switch i32 %x, label %if.end [
; CHECK: i32 6, label %if.then
; CHECK: i32 4, label %if.then
; CHECK: i32 3, label %if.then
; CHECK: i32 1, label %if.then
; CHECK: i32 0, label %if.then
; CHECK: ]
}
; Don't crash on ginormous ranges.
define void @test15(i128 %x) nounwind {
%cmp = icmp ugt i128 %x, 2
br i1 %cmp, label %if.end, label %lor.false
lor.false:
%cmp2 = icmp ne i128 %x, 100000000000000000000
br i1 %cmp2, label %if.end, label %if.then
if.then:
call void @foo1() noredzone
br label %if.end
if.end:
ret void
; CHECK: @test15
; CHECK-NOT: switch
; CHECK: ret void
}
; PR8675
; rdar://5134905
define zeroext i1 @test16(i32 %x) nounwind {
entry:
; CHECK: @test16
; CHECK: %x.off = add i32 %x, -1
; CHECK: %switch = icmp ult i32 %x.off, 3
%cmp.i = icmp eq i32 %x, 1
br i1 %cmp.i, label %lor.end, label %lor.lhs.false
lor.lhs.false:
%cmp.i2 = icmp eq i32 %x, 2
br i1 %cmp.i2, label %lor.end, label %lor.rhs
lor.rhs:
%cmp.i1 = icmp eq i32 %x, 3
br label %lor.end
lor.end:
%0 = phi i1 [ true, %lor.lhs.false ], [ true, %entry ], [ %cmp.i1, %lor.rhs ]
ret i1 %0
}
; Check that we don't turn an icmp into a switch where it's not useful.
define void @test17(i32 %x, i32 %y) {
%cmp = icmp ult i32 %x, 3
%switch = icmp ult i32 %y, 2
%or.cond775 = or i1 %cmp, %switch
br i1 %or.cond775, label %lor.lhs.false8, label %return
lor.lhs.false8:
tail call void @foo1()
ret void
return:
ret void
; CHECK: @test17
; CHECK-NOT: switch.early.test
; CHECK-NOT: switch i32
; CHECK: ret void
}