Index: test/CodeGen/X86/shift-i256.ll
===================================================================
--- test/CodeGen/X86/shift-i256.ll
+++ test/CodeGen/X86/shift-i256.ll
@@ -1,9 +1,21 @@
-; RUN: llc < %s -march=x86
-; RUN: llc < %s -march=x86-64
+; RUN: llc < %s -march=x86        | FileCheck %s
+; RUN: llc < %s -march=x86-64 -O0 | FileCheck %s -check-prefix=CHECK-X64
+; RUN: llc < %s -march=x86-64 -O2 | FileCheck %s -check-prefix=CHECK-X64
 
-define void @t(i256 %x, i256 %a, i256* nocapture %r) nounwind readnone {
+; CHECK-LABEL: shift1
+define void @shift1(i256 %x, i256 %a, i256* nocapture %r) nounwind readnone {
 entry:
 	%0 = ashr i256 %x, %a
 	store i256 %0, i256* %r
         ret void
 }
+
+; CHECK-LABEL: shift2
+define i256 @shift2(i256 %c) nounwind
+{
+  %b = shl i256 1, %c  ; %c must not be a constant
+  ; Special case when %c is 0:
+  ; CHECK-X64: testb [[REG:%r[0-9]+b]], [[REG]]
+  ; CHECK-X64: cmoveq
+  ret i256 %b
+}