[PATCH] Regression test for lshr codegen bug

[Paweł Bylica]

Test for bug report http://llvm.org/bugs/show_bug.cgi?id=22304

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7141

Files:
  test/CodeGen/Generic/lshr_bug_queue_is_empty.ll

Index: test/CodeGen/Generic/lshr_bug_queue_is_empty.ll
===================================================================
--- /dev/null
+++ test/CodeGen/Generic/lshr_bug_queue_is_empty.ll
@@ -0,0 +1,21 @@
+; RUN: llc < %s
+
+define void @lshr_codegen_bug_queue_is_empty() {
+entry:
+  %0 = load i256* undef
+  %1 = sub i256 0, %0
+  %k_32 = trunc i256 %1 to i5
+  %2 = zext i5 %k_32 to i256
+  %kx8 = mul i256 %2, 8
+  %bitpos = add i256 %kx8, 7
+  %bitval = lshr i256 %1, %bitpos
+  %bittest = trunc i256 %bitval to i1
+  %3 = shl i256 1, %bitpos
+  %mask = sub i256 %3, 1
+  %4 = and i256 %1, %mask
+  %5 = icmp ule i256 %1, 30
+  %6 = select i1 %bittest, i256 undef, i256 %4
+  %7 = select i1 %5, i256 %6, i256 %1
+  store i256 %7, i256* undef
+  ret void
+}

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