Simplify trunc(extend(x)) in SCEVs, just for completeness. Also fix some odd

whitespace in the same file.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69870 91177308-0d34-0410-b5e6-96231b3b80d8

test/Analysis/ScalarEvolution/2009-04-22-TruncCast.ll

@@ -0,0 +1,37 @@
+; RUN: llvm-as < %s | opt -analyze -scalar-evolution | grep truncate | not grep extend
+
+define i16 @test1(i8 %x) {
+  %A = sext i8 %x to i32
+  %B = trunc i32 %A to i16
+  ret i16 %B
+}
+
+define i8 @test2(i16 %x) {
+  %A = sext i16 %x to i32
+  %B = trunc i32 %A to i8
+  ret i8 %B
+}
+
+define i16 @test3(i16 %x) {
+  %A = sext i16 %x to i32
+  %B = trunc i32 %A to i16
+  ret i16 %B
+}
+
+define i16 @test4(i8 %x) {
+  %A = zext i8 %x to i32
+  %B = trunc i32 %A to i16
+  ret i16 %B
+}
+
+define i8 @test5(i16 %x) {
+  %A = zext i16 %x to i32
+  %B = trunc i32 %A to i8
+  ret i8 %B
+}
+
+define i16 @test6(i16 %x) {
+  %A = zext i16 %x to i32
+  %B = trunc i32 %A to i16
+  ret i16 %B
+}