X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=test%2FTransforms%2FSimplifyCFG%2FUnreachableEliminate.ll;h=21428c62f5316233edfe7b220c0a45bb593ae02c;hp=09c41a90dcf2f2006c648c76795f09b188c9a4e1;hb=ca5ffd51d96779248879c0e1d33dede9dca6caf4;hpb=d7e30973cdf378d50b862431fc96128b1df81416

diff --git a/test/Transforms/SimplifyCFG/UnreachableEliminate.ll b/test/Transforms/SimplifyCFG/UnreachableEliminate.ll
index 09c41a90dcf..21428c62f53 100644
--- a/test/Transforms/SimplifyCFG/UnreachableEliminate.ll
+++ b/test/Transforms/SimplifyCFG/UnreachableEliminate.ll
@@ -1,29 +1,120 @@
-; 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
 }