1 files changed, 23 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/rotate-extract.ll b/llvm/test/CodeGen/X86/rotate-extract.ll
index e5228d271e9..62d16163f34 100644
--- a/llvm/test/CodeGen/X86/rotate-extract.ll
+++ b/llvm/test/CodeGen/X86/rotate-extract.ll
@@ -265,3 +265,26 @@ define i8 @no_extract_udiv(i8 %i) nounwind {
   %out = or i8 %lhs_shift, %rhs_div
   ret i8 %out
 }
+
+; DAGCombiner transforms shl X, 1 into add X, X.
+define i32 @extract_add_1(i32 %i) nounwind {
+; X86-LABEL: extract_add_1:
+; X86:       # %bb.0:
+; X86-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; X86-NEXT:    leal (%ecx,%ecx), %eax
+; X86-NEXT:    shrl $31, %ecx
+; X86-NEXT:    orl %ecx, %eax
+; X86-NEXT:    retl
+;
+; X64-LABEL: extract_add_1:
+; X64:       # %bb.0:
+; X64-NEXT:    # kill: def $edi killed $edi def $rdi
+; X64-NEXT:    leal (%rdi,%rdi), %eax
+; X64-NEXT:    shrl $31, %edi
+; X64-NEXT:    orl %edi, %eax
+; X64-NEXT:    retq
+  %ii = add i32 %i, %i
+  %rhs = lshr i32 %i, 31
+  %out = or i32 %ii, %rhs
+  ret i32 %out
+}