Add test case for PR1261, currently XFAILed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35192 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/2007-03-19-BadTruncChangePR1261.ll b/test/Transforms/InstCombine/2007-03-19-BadTruncChangePR1261.ll
new file mode 100644 (file)
index 0000000..bdf3cca
--- /dev/null
+++ b/test/Transforms/InstCombine/2007-03-19-BadTruncChangePR1261.ll
@@ -0,0 +1,14 @@
+; For PR1261. Before bit accurate type support in InstCombine, this would
+; turn the sext into a zext.
+; RUN: llvm-as %s -o - | opt -instcombine | llvm-dis &&
+; RUN: llvm-as %s -o - | opt -instcombine | llvm-dis | not grep zext
+; XFAIL: *
+
+define i16 @test(i31 %zzz) {
+entry:
+  %A = sext i31 %zzz to i32
+  %B = add i32 %A, 16384
+  %C = lshr i32 %B, 15
+  %D = trunc i32 %C to i16
+  ret i16 %D
+}