[llvm-commits] CVS: llvm/test/Regression/Transforms/SimplifyCFG/switch_switch_fold.ll

[Chris Lattner]

Changes in directory llvm/test/Regression/Transforms/SimplifyCFG:

switch_switch_fold.ll added (r1.1)

---
Log message:

New testcase.  Switch instructions that go to switch instructions should be
merged.


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Diffs of the changes:  (+46 -0)

Index: llvm/test/Regression/Transforms/SimplifyCFG/switch_switch_fold.ll
diff -c /dev/null llvm/test/Regression/Transforms/SimplifyCFG/switch_switch_fold.ll:1.1
*** /dev/null	Tue Feb 24 01:21:19 2004
--- llvm/test/Regression/Transforms/SimplifyCFG/switch_switch_fold.ll	Tue Feb 24 01:21:09 2004
***************
*** 0 ****
--- 1,46 ----
+ ; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | grep switch | wc -l | grep 1
+ 
+ ; Test that a switch going to a switch on the same value can be merged.   All 
+ ; three switches in this example can be merged into one big one.
+ 
+ declare void %foo1()
+ declare void %foo2()
+ declare void %foo3()
+ declare void %foo4()
+ 
+ void %test1(uint %V) {
+         switch uint %V, label %F [
+                  uint 4, label %T
+                  uint 17, label %T
+                  uint 5, label %T
+                  uint 1234, label %F
+         ]
+ 
+ T:
+         switch uint %V, label %F [
+                  uint 4, label %A
+                  uint 17, label %B
+ 		 uint 42, label %C
+         ]
+ A:
+         call void %foo1()
+         ret void
+ 
+ B:
+         call void %foo2()
+         ret void
+ C:
+ 	call void %foo3()
+ 	ret void
+ 
+ F:
+         switch uint %V, label %F [
+                  uint 4, label %B
+                  uint 18, label %B
+ 		 uint 42, label %D
+         ]
+ D:
+         call void %foo4()
+         ret void
+ }
+