Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Transforms/SimplifyCFG/2003-08-17-FoldSwitch-dbg.ll

@@ -0,0 +1,57 @@
+; RUN: opt < %s -simplifycfg -S | FileCheck %s
+
+; CHECK-NOT: switch
+        %llvm.dbg.anchor.type = type { i32, i32 }
+        %llvm.dbg.compile_unit.type = type { i32, { }*, i32, i8*, i8*, i8*, i1, i1, i8* }
+
+@llvm.dbg.compile_units = linkonce constant %llvm.dbg.anchor.type { i32 458752, i32 17 }, section "llvm.metadata"
+
+@.str = internal constant [4 x i8] c"a.c\00", section "llvm.metadata"		; <[4 x i8]*> [#uses=1]
+@.str1 = internal constant [6 x i8] c"/tmp/\00", section "llvm.metadata"	; <[6 x i8]*> [#uses=1]
+@.str2 = internal constant [55 x i8] c"4.2.1 (Based on Apple Inc. build 5636) (LLVM build 00)\00", section "llvm.metadata"		; <[55 x i8]*> [#uses=1]
+@llvm.dbg.compile_unit = internal constant %llvm.dbg.compile_unit.type { i32 458769, { }* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.compile_units to { }*), i32 1, i8* getelementptr ([4 x i8], [4 x i8]* @.str, i32 0, i32 0), i8* getelementptr ([6 x i8], [6 x i8]* @.str1, i32 0, i32 0), i8* getelementptr ([55 x i8], [55 x i8]* @.str2, i32 0, i32 0), i1 true, i1 false, i8* null }, section "llvm.metadata"		; <%llvm.dbg.compile_unit.type*> [#uses=1]
+
+declare void @llvm.dbg.stoppoint(i32, i32, { }*) nounwind
+
+; Test folding all to same dest
+define i32 @test3(i1 %C) {
+        br i1 %C, label %Start, label %TheDest
+Start:          ; preds = %0
+call void @llvm.dbg.stoppoint(i32 5, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
+        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
+call void @llvm.dbg.stoppoint(i32 5, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
+        ret i32 0
+L2:             ; preds = %0
+call void @llvm.dbg.stoppoint(i32 5, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
+        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
+call void @llvm.dbg.stoppoint(i32 5, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
+        ret i32 0
+L2:             ; preds = %0
+call void @llvm.dbg.stoppoint(i32 5, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
+        ret i32 1
+}
+