+; RUN: llc -march=x86-64 < %s | FileCheck %s
+;
+; Check that x86's peephole optimization doesn't fold a 64-bit load (movsd) into
+; addpd.
+; rdar://problem/18236850
+
+%struct.S1 = type { double, double }
+
+@g = common global %struct.S1 zeroinitializer, align 8
+
+declare void @foo3(%struct.S1*)
+
+; CHECK: movsd (%rsp), [[R0:%xmm[0-9]+]]
+; CHECK: addpd [[R0]], %xmm{{[0-9]+}}
+
+define void @foo1(double %a.coerce0, double %a.coerce1, double %b.coerce0, double %b.coerce1) {
+ %1 = alloca <2 x double>, align 16
+ %tmpcast = bitcast <2 x double>* %1 to %struct.S1*
+ call void @foo3(%struct.S1* %tmpcast) #2
+ %p2 = getelementptr inbounds %struct.S1* %tmpcast, i64 0, i32 0
+ %2 = load double* %p2, align 16
+ %p3 = getelementptr inbounds %struct.S1* %tmpcast, i64 0, i32 1
+ %3 = load double* %p3, align 8
+ %4 = insertelement <2 x double> undef, double %2, i32 0
+ %5 = insertelement <2 x double> %4, double 0.000000e+00, i32 1
+ %6 = insertelement <2 x double> undef, double %3, i32 1
+ %7 = insertelement <2 x double> %6, double 1.000000e+00, i32 0
+ %8 = fadd <2 x double> %5, %7
+ store <2 x double> %8, <2 x double>* bitcast (%struct.S1* @g to <2 x double>*), align 16
+ ret void
+}