114 lines
3.1 KiB
LLVM
114 lines
3.1 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
|
|
|
|
; Test that we can thread a simple known condition through switch statements.
|
|
|
|
declare void @foo1()
|
|
|
|
declare void @foo2()
|
|
|
|
declare void @DEAD()
|
|
|
|
define void @test1(i32 %V) {
|
|
switch i32 %V, label %A [
|
|
i32 4, label %T
|
|
i32 17, label %Done
|
|
i32 1234, label %A
|
|
]
|
|
;; V == 4 if we get here.
|
|
T: ; preds = %0
|
|
call void @foo1( )
|
|
;; This switch is always statically determined.
|
|
switch i32 %V, label %A2 [
|
|
i32 4, label %B
|
|
i32 17, label %C
|
|
i32 42, label %C
|
|
]
|
|
A2: ; preds = %T
|
|
call void @DEAD( )
|
|
call void @DEAD( )
|
|
;; always true
|
|
%cond2 = icmp eq i32 %V, 4 ; <i1> [#uses=1]
|
|
br i1 %cond2, label %Done, label %C
|
|
A: ; preds = %0, %0
|
|
call void @foo1( )
|
|
;; always true
|
|
%cond = icmp ne i32 %V, 4 ; <i1> [#uses=1]
|
|
br i1 %cond, label %Done, label %C
|
|
Done: ; preds = %B, %A, %A2, %0
|
|
ret void
|
|
B: ; preds = %T
|
|
call void @foo2( )
|
|
;; always true
|
|
%cond3 = icmp eq i32 %V, 4 ; <i1> [#uses=1]
|
|
br i1 %cond3, label %Done, label %C
|
|
C: ; preds = %B, %A, %A2, %T, %T
|
|
call void @DEAD( )
|
|
ret void
|
|
|
|
; CHECK-LABEL: @test1(
|
|
; CHECK-NEXT: switch i32 %V, label %A [
|
|
; CHECK-NEXT: i32 4, label %T
|
|
; CHECK-NEXT: i32 17, label %Done
|
|
; CHECK-NEXT: ]
|
|
; CHECK: T:
|
|
; CHECK-NEXT: call void @foo1()
|
|
; CHECK-NEXT: call void @foo2()
|
|
; CHECK-NEXT: br label %Done
|
|
; CHECK: A:
|
|
; CHECK-NEXT: call void @foo1()
|
|
; CHECK-NEXT: br label %Done
|
|
; CHECK: Done:
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|
|
define void @test2(i32 %V) {
|
|
switch i32 %V, label %A [
|
|
i32 4, label %T
|
|
i32 17, label %D
|
|
i32 1234, label %E
|
|
]
|
|
;; V != 4, 17, 1234 here.
|
|
A: ; preds = %0
|
|
call void @foo1( )
|
|
;; This switch is always statically determined.
|
|
switch i32 %V, label %E [
|
|
i32 4, label %C
|
|
i32 17, label %C
|
|
i32 42, label %D
|
|
]
|
|
;; unreacahble.
|
|
C: ; preds = %A, %A
|
|
call void @DEAD( )
|
|
ret void
|
|
T: ; preds = %0
|
|
call void @foo1( )
|
|
call void @foo1( )
|
|
ret void
|
|
D: ; preds = %A, %0
|
|
call void @foo1( )
|
|
ret void
|
|
E: ; preds = %A, %0
|
|
ret void
|
|
|
|
; CHECK-LABEL: @test2(
|
|
; CHECK-NEXT: switch i32 %V, label %A [
|
|
; CHECK-NEXT: i32 4, label %T
|
|
; CHECK-NEXT: i32 17, label %D
|
|
; CHECK-NEXT: i32 1234, label %E
|
|
; CHECK-NEXT: ]
|
|
; CHECK: A:
|
|
; CHECK-NEXT: call void @foo1()
|
|
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 %V, 42
|
|
; CHECK-NEXT: br i1 [[COND]], label %D, label %E
|
|
; CHECK: T:
|
|
; CHECK-NEXT: call void @foo1()
|
|
; CHECK-NEXT: call void @foo1()
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: D:
|
|
; CHECK-NEXT: call void @foo1()
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: E:
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|