81 lines
2.0 KiB
LLVM
81 lines
2.0 KiB
LLVM
|
; RUN: opt < %s -simplifycfg -S | \
|
||
|
|
; RUN: not grep switch
|
||
|
|
|
||
|
|
; Test normal folding
|
||
|
|
define i32 @test1() {
|
||
|
|
switch i32 5, label %Default [
|
||
|
|
i32 0, label %Foo
|
||
|
|
i32 1, label %Bar
|
||
|
|
i32 2, label %Baz
|
||
|
|
i32 5, label %TheDest
|
||
|
|
]
|
||
|
|
Default: ; preds = %0
|
||
|
|
ret i32 -1
|
||
|
|
Foo: ; preds = %0
|
||
|
|
ret i32 -2
|
||
|
|
Bar: ; preds = %0
|
||
|
|
ret i32 -3
|
||
|
|
Baz: ; preds = %0
|
||
|
|
ret i32 -4
|
||
|
|
TheDest: ; preds = %0
|
||
|
|
ret i32 1234
|
||
|
|
}
|
||
|
|
|
||
|
|
; Test folding to default dest
|
||
|
|
define i32 @test2() {
|
||
|
|
switch i32 3, label %Default [
|
||
|
|
i32 0, label %Foo
|
||
|
|
i32 1, label %Bar
|
||
|
|
i32 2, label %Baz
|
||
|
|
i32 5, label %TheDest
|
||
|
|
]
|
||
|
|
Default: ; preds = %0
|
||
|
|
ret i32 1234
|
||
|
|
Foo: ; preds = %0
|
||
|
|
ret i32 -2
|
||
|
|
Bar: ; preds = %0
|
||
|
|
ret i32 -5
|
||
|
|
Baz: ; preds = %0
|
||
|
|
ret i32 -6
|
||
|
|
TheDest: ; preds = %0
|
||
|
|
ret i32 -8
|
||
|
|
}
|
||
|
|
|
||
|
|
; Test folding all to same dest
|
||
|
|
define i32 @test3(i1 %C) {
|
||
|
|
br i1 %C, label %Start, label %TheDest
|
||
|
|
Start: ; preds = %0
|
||
|
|
switch i32 3, label %TheDest [
|
||
|
|
i32 0, label %TheDest
|
||
|
|
i32 1, label %TheDest
|
||
|
|
i32 2, label %TheDest
|
||
|
|
i32 5, label %TheDest
|
||
|
|
]
|
||
|
|
TheDest: ; preds = %Start, %Start, %Start, %Start, %Start, %0
|
||
|
|
ret i32 1234
|
||
|
|
}
|
||
|
|
|
||
|
|
; Test folding switch -> branch
|
||
|
|
define i32 @test4(i32 %C) {
|
||
|
|
switch i32 %C, label %L1 [
|
||
|
|
i32 0, label %L2
|
||
|
|
]
|
||
|
|
L1: ; preds = %0
|
||
|
|
ret i32 0
|
||
|
|
L2: ; preds = %0
|
||
|
|
ret i32 1
|
||
|
|
}
|
||
|
|
|
||
|
|
; Can fold into a cond branch!
|
||
|
|
define i32 @test5(i32 %C) {
|
||
|
|
switch i32 %C, label %L1 [
|
||
|
|
i32 0, label %L2
|
||
|
|
i32 123, label %L1
|
||
|
|
]
|
||
|
|
L1: ; preds = %0, %0
|
||
|
|
ret i32 0
|
||
|
|
L2: ; preds = %0
|
||
|
|
ret i32 1
|
||
|
|
}
|
||
|
|
|