LegalizeTypes: Handle shift by 0 in ExpandShiftByConstant.
Though such shifts are usually optimized away by combiner, we still can
encounter them after a vector shift is legalized.
llvm-svn: 231443
diff --git a/llvm/test/CodeGen/X86/vec_shift7.ll b/llvm/test/CodeGen/X86/vec_shift7.ll
new file mode 100644
index 0000000..cdf8289
--- /dev/null
+++ b/llvm/test/CodeGen/X86/vec_shift7.ll
@@ -0,0 +1,12 @@
+; RUN: llc < %s -march=x86 -mcpu=yonah | FileCheck %s
+
+
+; Verify that we don't fail when shift by zero is encountered.
+
+define i64 @test1(<2 x i64> %a) {
+entry:
+ %c = shl <2 x i64> %a, <i64 0, i64 2>
+ %d = extractelement <2 x i64> %c, i32 0
+ ret i64 %d
+}
+; CHECK-LABEL: test1