1 files changed, 27 insertions, 0 deletions
diff --git a/test/CodeGen/X86/mul-i256.ll b/test/CodeGen/X86/mul-i256.ll
new file mode 100644
index 000000000000..8b8b10aa1790
--- /dev/null
+++ b/test/CodeGen/X86/mul-i256.ll
@@ -0,0 +1,27 @@
+; RUN: llc < %s | FileCheck %s
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @test(i256* %a, i256* %b, i256* %out) #0 {
+entry:
+  %av = load i256, i256* %a
+  %bv = load i256, i256* %b
+  %r = mul i256 %av, %bv
+  store i256 %r, i256* %out
+  ret void
+}
+
+; CHECK-LABEL: @test
+; There is a lot of inter-register motion, and so matching the instruction
+; sequence will be fragile. There should be 6 underlying multiplications.
+; CHECK: imulq
+; CHECK: imulq
+; CHECK: imulq
+; CHECK: imulq
+; CHECK: imulq
+; CHECK: imulq
+; CHECK-NOT: imulq
+; CHECK: retq
+
+attributes #0 = { norecurse nounwind uwtable "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" }
+