diff --git a/llvm/test/Transforms/InstCombine/fdiv.ll b/llvm/test/Transforms/InstCombine/fdiv.ll
--- a/llvm/test/Transforms/InstCombine/fdiv.ll
+++ b/llvm/test/Transforms/InstCombine/fdiv.ll
@@ -187,6 +187,21 @@
   ret float %div2
 }
 
+; Z / (1.0 / Y)
+
+define float @div_with_div_denominator_with_one_as_numerator_extra_use(float %x, float %y, float %z) {
+; CHECK-LABEL: @div_with_div_denominator_with_one_as_numerator_extra_use(
+; CHECK-NEXT:    [[DIV1:%.*]] = fdiv float 1.000000e+00, [[Y:%.*]]
+; CHECK-NEXT:    [[DIV2:%.*]] = fdiv fast float [[Z:%.*]], [[DIV1]]
+; CHECK-NEXT:    call void @use_f32(float [[DIV1]])
+; CHECK-NEXT:    ret float [[DIV2]]
+;
+  %div1 = fdiv float 1.0, %y
+  %div2 = fdiv fast float %z, %div1
+  call void @use_f32(float %div1)
+  ret float %div2
+}
+
 define float @fneg_fneg(float %x, float %y) {
 ; CHECK-LABEL: @fneg_fneg(
 ; CHECK-NEXT:    [[DIV:%.*]] = fdiv float [[X:%.*]], [[Y:%.*]]