-; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | not grep unreachable
+; RUN: opt < %s -simplifycfg -S | FileCheck %s
-void %test1(bool %C, bool* %BP) {
- br bool %C, label %T, label %F
+define void @test1(i1 %C, i1* %BP) {
+; CHECK-LABEL: @test1(
+; CHECK: entry:
+; CHECK-NEXT: ret void
+entry:
+ br i1 %C, label %T, label %F
T:
- store bool %C, bool* %BP ;; dead
- unreachable
+ store i1 %C, i1* %BP
+ unreachable
F:
- ret void
+ ret void
}
-void %test2() {
- invoke void %test2() to label %N unwind label %U
+define void @test2() {
+; CHECK-LABEL: @test2(
+; CHECK: entry:
+; CHECK-NEXT: call void @test2()
+; CHECK-NEXT: ret void
+entry:
+ invoke void @test2( )
+ to label %N unwind label %U
U:
- unreachable
+ unreachable
N:
- ret void
+ ret void
}
-int %test3(int %v) {
- switch int %v, label %default [ int 1, label %U
- int 2, label %T]
+define i32 @test3(i32 %v) {
+; CHECK-LABEL: @test3(
+; CHECK: entry:
+; CHECK-NEXT: [[CMP:%[A-Za-z0-9]+]] = icmp eq i32 %v, 2
+; CHECK-NEXT: select i1 [[CMP]], i32 2, i32 1
+; CHECK-NEXT: ret
+entry:
+ switch i32 %v, label %default [
+ i32 1, label %U
+ i32 2, label %T
+ ]
default:
- ret int 1
+ ret i32 1
U:
- unreachable
+ unreachable
T:
- ret int 2
+ ret i32 2
+}
+
+; PR9450
+define i32 @test4(i32 %v, i32 %w) {
+; CHECK: entry:
+; CHECK-NEXT: switch i32 %v, label %T [
+; CHECK-NEXT: i32 3, label %V
+; CHECK-NEXT: i32 2, label %U
+; CHECK-NEXT: ]
+
+entry:
+ br label %SWITCH
+V:
+ ret i32 7
+SWITCH:
+ switch i32 %v, label %default [
+ i32 1, label %T
+ i32 2, label %U
+ i32 3, label %V
+ ]
+default:
+ unreachable
+U:
+ ret i32 %w
+T:
+ ret i32 2
+}
+
+
+;; We can either convert the following control-flow to a select or remove the
+;; unreachable control flow because of the undef store of null. Make sure we do
+;; the latter.
+
+define void @test5(i1 %cond, i8* %ptr) {
+
+; CHECK-LABEL: test5
+; CHECK: entry:
+; CHECK-NOT: select
+; CHECK: store i8 2, i8* %ptr
+; CHECK: ret
+
+entry:
+ br i1 %cond, label %bb1, label %bb3
+
+bb3:
+ br label %bb2
+
+bb1:
+ br label %bb2
+
+bb2:
+ %ptr.2 = phi i8* [ %ptr, %bb3 ], [ null, %bb1 ]
+ store i8 2, i8* %ptr.2, align 8
+ ret void
+}
+
+; CHECK-LABEL: test6
+; CHECK: entry:
+; CHECK-NOT: select
+; CHECK: store i8 2, i8* %ptr
+; CHECK: ret
+
+define void @test6(i1 %cond, i8* %ptr) {
+entry:
+ br i1 %cond, label %bb1, label %bb2
+
+bb1:
+ br label %bb2
+
+bb2:
+ %ptr.2 = phi i8* [ %ptr, %entry ], [ null, %bb1 ]
+ store i8 2, i8* %ptr.2, align 8
+ ret void
}