1 files changed, 35 insertions, 1 deletions
diff --git a/test/CodeGen/X86/i128-mul.ll b/test/CodeGen/X86/i128-mul.ll
index e9d30d67019..c0b85dfd211 100644
--- a/test/CodeGen/X86/i128-mul.ll
+++ b/test/CodeGen/X86/i128-mul.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=x86-64
+; RUN: llc < %s -march=x86-64 | FileCheck %s
 ; PR1198
 
 define i64 @foo(i64 %x, i64 %y) {
@@ -10,3 +10,37 @@ define i64 @foo(i64 %x, i64 %y) {
         %tmp4 = trunc i128 %tmp3 to i64
         ret i64 %tmp4
 }
+
+; <rdar://problem/14096009> superfluous multiply by high part of
+; zero-extended value.
+; CHECK: @mul1
+; CHECK-NOT: imulq
+; CHECK: mulq
+; CHECK-NOT: imulq
+define i64 @mul1(i64 %n, i64* nocapture %z, i64* nocapture %x, i64 %y) {
+entry:
+  %conv = zext i64 %y to i128
+  %cmp11 = icmp eq i64 %n, 0
+  br i1 %cmp11, label %for.end, label %for.body
+
+for.body:                                         ; preds = %entry, %for.body
+  %carry.013 = phi i64 [ %conv6, %for.body ], [ 0, %entry ]
+  %i.012 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
+  %arrayidx = getelementptr inbounds i64* %x, i64 %i.012
+  %0 = load i64* %arrayidx, align 8
+  %conv2 = zext i64 %0 to i128
+  %mul = mul i128 %conv2, %conv
+  %conv3 = zext i64 %carry.013 to i128
+  %add = add i128 %mul, %conv3
+  %conv4 = trunc i128 %add to i64
+  %arrayidx5 = getelementptr inbounds i64* %z, i64 %i.012
+  store i64 %conv4, i64* %arrayidx5, align 8
+  %shr = lshr i128 %add, 64
+  %conv6 = trunc i128 %shr to i64
+  %inc = add i64 %i.012, 1
+  %exitcond = icmp eq i64 %inc, %n
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body, %entry
+  ret i64 0
+}