Add test case for PR16785.

Thanks for Dimitry Andric, Rafael Espindola, and Benjamin Kramer
for providing and progressively reducing the test case!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191782 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/atom-lea-addw-bug.ll b/test/CodeGen/X86/atom-lea-addw-bug.ll
new file mode 100644 (file)
index 0000000..5cda2df
--- /dev/null
+++ b/test/CodeGen/X86/atom-lea-addw-bug.ll
@@ -0,0 +1,19 @@
+; RUN: llc < %s -mcpu=atom | FileCheck %s
+
+; ModuleID = 'bugpoint-reduced-simplified.bc'
+target triple = "x86_64-apple-darwin12.5.0"
+
+define i32 @DoLayout() {
+entry:
+  %tmp1 = load i16* undef, align 2
+  %tmp17 = load i16* null, align 2
+  %tmp19 = load i16* undef, align 2
+  %shl = shl i16 %tmp19, 1
+  %add55 = add i16 %tmp17, %tmp1
+  %add57 = add i16 %add55, %shl
+  %conv60 = zext i16 %add57 to i32
+  %add61 = add nsw i32 %conv60, 0
+  %conv63 = and i32 %add61, 65535
+  ret i32 %conv63
+; CHECK: addw
+}