1 files changed, 149 insertions, 0 deletions
diff --git a/llvm/test/Transforms/SimplifyCFG/MagicPointer.ll b/llvm/test/Transforms/SimplifyCFG/MagicPointer.ll
new file mode 100644
index 00000000000..7789600f3f0
--- /dev/null
+++ b/llvm/test/Transforms/SimplifyCFG/MagicPointer.ll
@@ -0,0 +1,149 @@
+; Test that simplifycfg can create switch instructions from constant pointers.
+;
+; RUN: opt < %s -simplifycfg -S | FileCheck %s
+
+target datalayout = "e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-darwin10.0.0"
+
+@.str = private constant [5 x i8] c"null\00"      ; <[5 x i8]*> [#uses=2]
+@.str1 = private constant [4 x i8] c"one\00"      ; <[4 x i8]*> [#uses=2]
+@.str2 = private constant [4 x i8] c"two\00"      ; <[4 x i8]*> [#uses=2]
+@.str3 = private constant [5 x i8] c"four\00"     ; <[5 x i8]*> [#uses=2]
+
+@.str_as1 = private addrspace(1) constant [5 x i8] c"null\00"      ; <[5 x i8]*> [#uses=2]
+@.str1_as1 = private addrspace(1) constant [4 x i8] c"one\00"      ; <[4 x i8]*> [#uses=2]
+@.str2_as1 = private addrspace(1) constant [4 x i8] c"two\00"      ; <[4 x i8]*> [#uses=2]
+@.str3_as1 = private addrspace(1) constant [5 x i8] c"four\00"     ; <[5 x i8]*> [#uses=2]
+
+declare i32 @puts(i8*)
+declare i32 @puts_as1(i8 addrspace(1)*)
+
+define void @f(i8* %x) nounwind ssp {
+; CHECK-LABEL: @f(
+; CHECK: switch i64 %magicptr
+; CHECK: i64 0, label
+; CHECK: i64 1, label
+; CHECK: i64 2, label
+; CHECK: i64 3, label
+; CHECK: i64 4, label
+; CHECK: }
+
+entry:
+  %tobool = icmp eq i8* %x, null                  ; <i1> [#uses=1]
+  br i1 %tobool, label %if.then, label %if.else
+
+if.then:                                          ; preds = %entry
+  %call = call i32 @puts(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0)) nounwind ; <i32> [#uses=0]
+  br label %if.end21
+
+if.else:                                          ; preds = %entry
+  %cmp = icmp eq i8* %x, inttoptr (i64 1 to i8*)  ; <i1> [#uses=1]
+  br i1 %cmp, label %if.then2, label %if.else4
+
+if.then2:                                         ; preds = %if.else
+  %call3 = call i32 @puts(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str1, i64 0, i64 0)) nounwind ; <i32> [#uses=0]
+  br label %if.end20
+
+if.else4:                                         ; preds = %if.else
+  %cmp6 = icmp eq i8* %x, inttoptr (i64 2 to i8*) ; <i1> [#uses=1]
+  br i1 %cmp6, label %if.then9, label %lor.lhs.false
+
+lor.lhs.false:                                    ; preds = %if.else4
+  %cmp8 = icmp eq i8* %x, inttoptr (i64 3 to i8*) ; <i1> [#uses=1]
+  br i1 %cmp8, label %if.then9, label %if.else11
+
+if.then9:                                         ; preds = %lor.lhs.false, %if.else4
+  %call10 = call i32 @puts(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str2, i64 0, i64 0)) nounwind ; <i32> [#uses=0]
+  br label %if.end19
+
+if.else11:                                        ; preds = %lor.lhs.false
+  %cmp13 = icmp eq i8* %x, inttoptr (i64 4 to i8*) ; <i1> [#uses=1]
+  br i1 %cmp13, label %if.then14, label %if.else16
+
+if.then14:                                        ; preds = %if.else11
+  %call15 = call i32 @puts(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str3, i64 0, i64 0)) nounwind ; <i32> [#uses=0]
+  br label %if.end
+
+if.else16:                                        ; preds = %if.else11
+  %call18 = call i32 @puts(i8* %x) nounwind       ; <i32> [#uses=0]
+  br label %if.end
+
+if.end:                                           ; preds = %if.else16, %if.then14
+  br label %if.end19
+
+if.end19:                                         ; preds = %if.end, %if.then9
+  br label %if.end20
+
+if.end20:                                         ; preds = %if.end19, %if.then2
+  br label %if.end21
+
+if.end21:                                         ; preds = %if.end20, %if.then
+  ret void
+}
+
+; Is it useful to test a version where the ptrtoints are to the same
+; size?
+define void @f_as1(i8 addrspace(1)* %x) nounwind ssp {
+; CHECK-LABEL: @f_as1(
+; CHECK: ptrtoint i8 addrspace(1)* %x to i16
+; CHECK: switch i16 %magicptr
+; CHECK: i16 0, label
+; CHECK: i16 1, label
+; CHECK: i16 2, label
+; CHECK: i16 3, label
+; CHECK: i16 4, label
+; CHECK: }
+
+entry:
+  %tobool = icmp eq i8 addrspace(1)* %x, null                  ; <i1> [#uses=1]
+  br i1 %tobool, label %if.then, label %if.else
+
+if.then:                                          ; preds = %entry
+  %call = call i32 @puts_as1(i8 addrspace(1)* getelementptr inbounds ([5 x i8], [5 x i8] addrspace(1)* @.str_as1, i64 0, i64 0)) nounwind ; <i32> [#uses=0]
+  br label %if.end21
+
+if.else:                                          ; preds = %entry
+  %cmp = icmp eq i8 addrspace(1)* %x, inttoptr (i64 1 to i8 addrspace(1)*)  ; <i1> [#uses=1]
+  br i1 %cmp, label %if.then2, label %if.else4
+
+if.then2:                                         ; preds = %if.else
+  %call3 = call i32 @puts_as1(i8 addrspace(1)* getelementptr inbounds ([4 x i8], [4 x i8] addrspace(1)* @.str1_as1, i64 0, i64 0)) nounwind ; <i32> [#uses=0]
+  br label %if.end20
+
+if.else4:                                         ; preds = %if.else
+  %cmp6 = icmp eq i8 addrspace(1)* %x, inttoptr (i64 2 to i8 addrspace(1)*) ; <i1> [#uses=1]
+  br i1 %cmp6, label %if.then9, label %lor.lhs.false
+
+lor.lhs.false:                                    ; preds = %if.else4
+  %cmp8 = icmp eq i8 addrspace(1)* %x, inttoptr (i64 3 to i8 addrspace(1)*) ; <i1> [#uses=1]
+  br i1 %cmp8, label %if.then9, label %if.else11
+
+if.then9:                                         ; preds = %lor.lhs.false, %if.else4
+  %call10 = call i32 @puts_as1(i8 addrspace(1)* getelementptr inbounds ([4 x i8], [4 x i8] addrspace(1)* @.str2_as1, i64 0, i64 0)) nounwind ; <i32> [#uses=0]
+  br label %if.end19
+
+if.else11:                                        ; preds = %lor.lhs.false
+  %cmp13 = icmp eq i8 addrspace(1)* %x, inttoptr (i64 4 to i8 addrspace(1)*) ; <i1> [#uses=1]
+  br i1 %cmp13, label %if.then14, label %if.else16
+
+if.then14:                                        ; preds = %if.else11
+  %call15 = call i32 @puts_as1(i8 addrspace(1)* getelementptr inbounds ([5 x i8], [5 x i8] addrspace(1)* @.str3_as1, i64 0, i64 0)) nounwind ; <i32> [#uses=0]
+  br label %if.end
+
+if.else16:                                        ; preds = %if.else11
+  %call18 = call i32 @puts_as1(i8 addrspace(1)* %x) nounwind       ; <i32> [#uses=0]
+  br label %if.end
+
+if.end:                                           ; preds = %if.else16, %if.then14
+  br label %if.end19
+
+if.end19:                                         ; preds = %if.end, %if.then9
+  br label %if.end20
+
+if.end20:                                         ; preds = %if.end19, %if.then2
+  br label %if.end21
+
+if.end21:                                         ; preds = %if.end20, %if.then
+  ret void
+}
+