Index: lib/Transforms/InstCombine/InstructionCombining.cpp
===================================================================
--- lib/Transforms/InstCombine/InstructionCombining.cpp
+++ lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -729,8 +729,8 @@
   // c, e)))
   Value *A, *B, *C, *D, *E;
   Value *SI = nullptr;
-  if (match(LHS, m_Select(m_Value(A), m_Value(B), m_Value(C))) &&
-      match(RHS, m_Select(m_Specific(A), m_Value(D), m_Value(E)))) {
+  if (match(LHS, m_OneUse(m_Select(m_Value(A), m_Value(B), m_Value(C)))) &&
+      match(RHS, m_OneUse(m_Select(m_Specific(A), m_Value(D), m_Value(E))))) {
     BuilderTy::FastMathFlagGuard Guard(Builder);
     if (isa<FPMathOperator>(&I))
       Builder.setFastMathFlags(I.getFastMathFlags());
Index: test/Transforms/InstCombine/select_arithmetic.ll
===================================================================
--- test/Transforms/InstCombine/select_arithmetic.ll
+++ test/Transforms/InstCombine/select_arithmetic.ll
@@ -38,3 +38,16 @@
 ; CHECK: ret float %tmp2
 }
 
+; Tests not folding constants if the selects have more than one use.
+declare void @use_double(double)
+define double @test4(i1 zeroext %arg, double %div) {
+  %tmp = select i1 %arg, double %div, double 5.000000e-03
+  %mul = fmul contract double %tmp, %tmp
+  call void @use_double(double %tmp)
+  ret double %mul
+; CHECK-LABEL: @test4(
+; CHECK: [[TMP:%.*]] = select i1 %arg, double %div, double 5.000000e-03
+; CHECK-NEXT: [[MUL:%.*]] = fmul contract double [[TMP]], [[TMP]]
+; CHECK-NOT: fmul contract double %div, %div
+; CHECK: ret double [[MUL]]
+}