Index: llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -2520,19 +2520,35 @@
   return nullptr;
 }
 
-static Instruction *hoistFNegAboveFMulFDiv(Instruction &I,
-                                           InstCombiner::BuilderTy &Builder) {
+Instruction *InstCombinerImpl::hoistFNegAboveFMulFDiv(Instruction &I) {
   Value *FNeg;
-  if (!match(&I, m_FNeg(m_Value(FNeg))))
+  if (!match(&I, m_FNeg(m_OneUse(m_Value(FNeg)))))
     return nullptr;
 
   Value *X, *Y;
-  if (match(FNeg, m_OneUse(m_FMul(m_Value(X), m_Value(Y)))))
+  if (match(FNeg, m_FMul(m_Value(X), m_Value(Y))))
     return BinaryOperator::CreateFMulFMF(Builder.CreateFNegFMF(X, &I), Y, &I);
 
-  if (match(FNeg, m_OneUse(m_FDiv(m_Value(X), m_Value(Y)))))
+  if (match(FNeg, m_FDiv(m_Value(X), m_Value(Y))))
     return BinaryOperator::CreateFDivFMF(Builder.CreateFNegFMF(X, &I), Y, &I);
 
+  if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(FNeg)) {
+    // Make sure to preserve flags and metadata on the call.
+    if (II->getIntrinsicID() == Intrinsic::ldexp) {
+      FastMathFlags FMF = I.getFastMathFlags();
+      FMF |= II->getFastMathFlags();
+
+      IRBuilder<>::FastMathFlagGuard FMFGuard(Builder);
+      Builder.setFastMathFlags(FMF);
+
+      CallInst *New = Builder.CreateCall(
+          II->getCalledFunction(),
+          {Builder.CreateFNeg(II->getArgOperand(0)), II->getArgOperand(1)});
+      New->copyMetadata(*II);
+      return replaceInstUsesWith(I, New);
+    }
+  }
+
   return nullptr;
 }
 
@@ -2553,7 +2569,7 @@
       match(Op, m_OneUse(m_FSub(m_Value(X), m_Value(Y)))))
     return BinaryOperator::CreateFSubFMF(Y, X, &I);
 
-  if (Instruction *R = hoistFNegAboveFMulFDiv(I, Builder))
+  if (Instruction *R = hoistFNegAboveFMulFDiv(I))
     return R;
 
   Value *OneUse;
@@ -2638,7 +2654,7 @@
   if (Instruction *X = foldFNegIntoConstant(I, DL))
     return X;
 
-  if (Instruction *R = hoistFNegAboveFMulFDiv(I, Builder))
+  if (Instruction *R = hoistFNegAboveFMulFDiv(I))
     return R;
 
   Value *X, *Y;
Index: llvm/lib/Transforms/InstCombine/InstCombineInternal.h
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineInternal.h
+++ llvm/lib/Transforms/InstCombine/InstCombineInternal.h
@@ -387,6 +387,8 @@
   Instruction *foldAndOrOfSelectUsingImpliedCond(Value *Op, SelectInst &SI,
                                                  bool IsAnd);
 
+  Instruction *hoistFNegAboveFMulFDiv(Instruction &I);
+
 public:
   /// Create and insert the idiom we use to indicate a block is unreachable
   /// without having to rewrite the CFG from within InstCombine.
Index: llvm/test/Transforms/InstCombine/fneg.ll
===================================================================
--- llvm/test/Transforms/InstCombine/fneg.ll
+++ llvm/test/Transforms/InstCombine/fneg.ll
@@ -1,6 +1,8 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -passes=instcombine -S | FileCheck %s
 
+declare float @llvm.ldexp.f32.i32(float, i32)
+declare <2 x float> @llvm.ldexp.v2f32.v2i32(<2 x float>, <2 x i32>)
 declare void @use(float)
 
 define float @fneg_fneg(float %a) {
@@ -829,3 +831,161 @@
   %r = fneg float %s
   ret float %r
 }
+
+define float @fneg_ldexp(float %x, i32 %n) {
+; CHECK-LABEL: @fneg_ldexp(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fneg float %ldexp
+  ret float %neg
+}
+
+define float @fsub_fneg_ldexp(float %x, i32 %n) {
+; CHECK-LABEL: @fsub_fneg_ldexp(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fsub float -0.0, %ldexp
+  ret float %neg
+}
+
+define float @fsub_fneg_ldexp_nsz(float %x, i32 %n) {
+; CHECK-LABEL: @fsub_fneg_ldexp_nsz(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg nsz float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call nsz float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fsub nsz float -0.0, %ldexp
+  ret float %neg
+}
+
+define float @fsub_fneg_ldexp_p0_nsz(float %x, i32 %n) {
+; CHECK-LABEL: @fsub_fneg_ldexp_p0_nsz(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg nsz float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call nsz float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fsub nsz float 0.0, %ldexp
+  ret float %neg
+}
+
+define float @fsub_fneg_ldexp_p0(float %x, i32 %n) {
+; CHECK-LABEL: @fsub_fneg_ldexp_p0(
+; CHECK-NEXT:    [[LDEXP:%.*]] = call float @llvm.ldexp.f32.i32(float [[X:%.*]], i32 [[N:%.*]])
+; CHECK-NEXT:    [[NEG:%.*]] = fsub float 0.000000e+00, [[LDEXP]]
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fsub float 0.0, %ldexp
+  ret float %neg
+}
+
+define <2 x float> @fneg_ldexp_vector(<2 x float> %x, <2 x i32> %n) {
+; CHECK-LABEL: @fneg_ldexp_vector(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg <2 x float> [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call <2 x float> @llvm.ldexp.v2f32.v2i32(<2 x float> [[TMP1]], <2 x i32> [[N:%.*]])
+; CHECK-NEXT:    ret <2 x float> [[NEG]]
+;
+  %ldexp = call <2 x float> @llvm.ldexp.v2f32.v2i32(<2 x float> %x, <2 x i32> %n)
+  %neg = fneg <2 x float> %ldexp
+  ret <2 x float> %neg
+}
+
+define float @fneg_ldexp_multiuse(float %x, i32 %n, ptr %ptr) {
+; CHECK-LABEL: @fneg_ldexp_multiuse(
+; CHECK-NEXT:    [[LDEXP:%.*]] = call float @llvm.ldexp.f32.i32(float [[X:%.*]], i32 [[N:%.*]])
+; CHECK-NEXT:    store float [[LDEXP]], ptr [[PTR:%.*]], align 4
+; CHECK-NEXT:    [[NEG:%.*]] = fneg float [[LDEXP]]
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  store float %ldexp, ptr %ptr
+  %neg = fneg float %ldexp
+  ret float %neg
+}
+
+define float @fneg_ldexp_fmf_ldexp(float %x, i32 %n) {
+; CHECK-LABEL: @fneg_ldexp_fmf_ldexp(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg nnan float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call nnan float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call nnan float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fneg float %ldexp
+  ret float %neg
+}
+
+define float @fneg_ldexp_fmf_neg(float %x, i32 %n) {
+; CHECK-LABEL: @fneg_ldexp_fmf_neg(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg nnan float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call nnan float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fneg nnan float %ldexp
+  ret float %neg
+}
+
+define float @fneg_ldexp_fmf(float %x, i32 %n) {
+; CHECK-LABEL: @fneg_ldexp_fmf(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg nnan ninf float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call nnan ninf float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call ninf float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fneg nnan float %ldexp
+  ret float %neg
+}
+
+define float @fneg_ldexp_contract0(float %x, i32 %n) {
+; CHECK-LABEL: @fneg_ldexp_contract0(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg contract float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call contract float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call contract float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fneg float %ldexp
+  ret float %neg
+}
+
+define float @fneg_ldexp_contract1(float %x, i32 %n) {
+; CHECK-LABEL: @fneg_ldexp_contract1(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg contract float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call contract float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fneg contract float %ldexp
+  ret float %neg
+}
+
+define float @fneg_ldexp_contract(float %x, i32 %n) {
+; CHECK-LABEL: @fneg_ldexp_contract(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg contract float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call contract float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]])
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call contract float @llvm.ldexp.f32.i32(float %x, i32 %n)
+  %neg = fneg contract float %ldexp
+  ret float %neg
+}
+
+define float @fneg_ldexp_metadata(float %x, i32 %n) {
+; CHECK-LABEL: @fneg_ldexp_metadata(
+; CHECK-NEXT:    [[TMP1:%.*]] = fneg float [[X:%.*]]
+; CHECK-NEXT:    [[NEG:%.*]] = call float @llvm.ldexp.f32.i32(float [[TMP1]], i32 [[N:%.*]]), !arst !0
+; CHECK-NEXT:    ret float [[NEG]]
+;
+  %ldexp = call float @llvm.ldexp.f32.i32(float %x, i32 %n), !arst !0
+  %neg = fneg float %ldexp
+  ret float %neg
+}
+
+!0 = !{}