1 files changed, 32 insertions, 0 deletions
diff --git a/test/CodeGen/X86/mul128_sext_loop.ll b/test/CodeGen/X86/mul128_sext_loop.ll
new file mode 100644
index 000000000000..a516f03cbc3e
--- /dev/null
+++ b/test/CodeGen/X86/mul128_sext_loop.ll
@@ -0,0 +1,32 @@
+; RUN: llc < %s -march=x86-64 | FileCheck %s
+
+define void @test(i64* nocapture %arr, i64 %arrsize, i64 %factor) nounwind uwtable {
+  %1 = icmp sgt i64 %arrsize, 0
+  br i1 %1, label %.lr.ph, label %._crit_edge
+
+.lr.ph:                                           ; preds = %0
+  %2 = sext i64 %factor to i128
+  br label %3
+
+; <label>:3                                       ; preds = %3, %.lr.ph
+; CHECK-NOT: mul
+; CHECK: imulq
+; CHECK-NOT: mul
+  %carry.02 = phi i128 [ 0, %.lr.ph ], [ %10, %3 ]
+  %i.01 = phi i64 [ 0, %.lr.ph ], [ %11, %3 ]
+  %4 = getelementptr inbounds i64* %arr, i64 %i.01
+  %5 = load i64* %4, align 8
+  %6 = sext i64 %5 to i128
+  %7 = mul nsw i128 %6, %2
+  %8 = add nsw i128 %7, %carry.02
+  %.tr = trunc i128 %8 to i64
+  %9 = and i64 %.tr, 9223372036854775807
+  store i64 %9, i64* %4, align 8
+  %10 = ashr i128 %8, 63
+  %11 = add nsw i64 %i.01, 1
+  %exitcond = icmp eq i64 %11, %arrsize
+  br i1 %exitcond, label %._crit_edge, label %3
+
+._crit_edge:                                      ; preds = %3, %0
+  ret void
+}