After reducing the size of an operation in the DAG we zero-extend the reduced

bitwidth op back to the original size. If we reduce ANDs then this can cause
an endless loop. This patch changes the ZEXT to ANY_EXTEND if the demanded bits
are equal or smaller than the size of the reduced operation.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170505 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/Generic/dag-combine-crash.ll

@@ -0,0 +1,21 @@
+; RUN: llc < %s
+
+define void @main()  {
+if.end:
+  br label %block.i.i
+
+block.i.i:
+  %tmpbb = load i8* undef
+  %tmp54 = zext i8 %tmpbb to i64
+  %tmp59 = and i64 %tmp54, 8
+  %tmp60 = add i64 %tmp59, 3691045929300498764
+  %tmp62 = sub i64 %tmp60, 3456506383779105993
+  %tmp63 = xor i64 1050774804270620004, %tmp62
+  %tmp65 = xor i64 %tmp62, 234539545521392771
+  %tmp67 = or i64 %tmp65, %tmp63
+  %tmp71 = xor i64 %tmp67, 6781485823212740913
+  %tmp72 = trunc i64 %tmp71 to i32
+  %tmp74 = lshr i32 2, %tmp72
+  store i32 %tmp74, i32* undef
+  br label %block.i.i
+}