Index: llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -902,6 +902,36 @@
   return CallInst::Create(MinMax, {LHS->getArgOperand(0), NewC});
 }
 
+/// If this min/max has a matching min/max operand with a constant, try to push
+/// the constant operand into this instruction. This can enable more folds.
+static Instruction *
+reassociateMinMaxWithConstantInOperand(IntrinsicInst *II,
+                                       InstCombiner::BuilderTy &Builder) {
+  // Match and capture a min/max operand candidate.
+  Value *X, *Y;
+  Constant *C;
+  Instruction *Inner;
+  if (!match(II, m_c_MaxOrMin(m_OneUse(m_CombineAnd(
+                                  m_Instruction(Inner),
+                                  m_MaxOrMin(m_Value(X), m_ImmConstant(C)))),
+                              m_Value(Y))))
+    return nullptr;
+
+  // The inner op must match. Check for constants to avoid infinite loops.
+  Intrinsic::ID MinMaxID = II->getIntrinsicID();
+  auto *InnerMM = dyn_cast<IntrinsicInst>(Inner);
+  if (!InnerMM || InnerMM->getIntrinsicID() != MinMaxID ||
+      match(X, m_Constant()) || match(Y, m_Constant()))
+    return nullptr;
+
+  // max (max X, C), Y --> max (max X, Y), C
+  Function *MinMax =
+      Intrinsic::getDeclaration(II->getModule(), MinMaxID, II->getType());
+  Value *NewInner = Builder.CreateBinaryIntrinsic(MinMaxID, X, Y);
+  NewInner->takeName(Inner);
+  return CallInst::Create(MinMax, {NewInner, C});
+}
+
 /// Reduce a sequence of min/max intrinsics with a common operand.
 static Instruction *factorizeMinMaxTree(IntrinsicInst *II) {
   // Match 3 of the same min/max ops. Example: umin(umin(), umin()).
@@ -1250,6 +1280,9 @@
     if (Instruction *NewMinMax = reassociateMinMaxWithConstants(II))
       return NewMinMax;
 
+    if (Instruction *R = reassociateMinMaxWithConstantInOperand(II, Builder))
+      return R;
+
     if (Instruction *NewMinMax = factorizeMinMaxTree(II))
        return NewMinMax;
 
Index: llvm/test/Transforms/InstCombine/minmax-intrinsics.ll
===================================================================
--- llvm/test/Transforms/InstCombine/minmax-intrinsics.ll
+++ llvm/test/Transforms/InstCombine/minmax-intrinsics.ll
@@ -2259,8 +2259,8 @@
 
 define i8 @smax_smax_reassoc_constant_sink(i8 %x, i8 %y) {
 ; CHECK-LABEL: @smax_smax_reassoc_constant_sink(
-; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.smax.i8(i8 [[X:%.*]], i8 42)
-; CHECK-NEXT:    [[M2:%.*]] = call i8 @llvm.smax.i8(i8 [[M1]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.smax.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[M2:%.*]] = call i8 @llvm.smax.i8(i8 [[M1]], i8 42)
 ; CHECK-NEXT:    ret i8 [[M2]]
 ;
   %m1 = call i8 @llvm.smax.i8(i8 %x, i8 42)
@@ -2270,8 +2270,8 @@
 
 define <3 x i8> @smin_smin_reassoc_constant_sink(<3 x i8> %x, <3 x i8> %y) {
 ; CHECK-LABEL: @smin_smin_reassoc_constant_sink(
-; CHECK-NEXT:    [[M1:%.*]] = call <3 x i8> @llvm.smin.v3i8(<3 x i8> [[X:%.*]], <3 x i8> <i8 43, i8 -43, i8 0>)
-; CHECK-NEXT:    [[M2:%.*]] = call <3 x i8> @llvm.smin.v3i8(<3 x i8> [[M1]], <3 x i8> [[Y:%.*]])
+; CHECK-NEXT:    [[M1:%.*]] = call <3 x i8> @llvm.smin.v3i8(<3 x i8> [[X:%.*]], <3 x i8> [[Y:%.*]])
+; CHECK-NEXT:    [[M2:%.*]] = call <3 x i8> @llvm.smin.v3i8(<3 x i8> [[M1]], <3 x i8> <i8 43, i8 -43, i8 0>)
 ; CHECK-NEXT:    ret <3 x i8> [[M2]]
 ;
   %m1 = call <3 x i8> @llvm.smin.v3i8(<3 x i8> %x, <3 x i8> <i8 43, i8 -43, i8 0>)
@@ -2281,8 +2281,8 @@
 
 define i8 @umax_umax_reassoc_constant_sink(i8 %x, i8 %y) {
 ; CHECK-LABEL: @umax_umax_reassoc_constant_sink(
-; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 42)
-; CHECK-NEXT:    [[M2:%.*]] = call i8 @llvm.umax.i8(i8 [[M1]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[M2:%.*]] = call i8 @llvm.umax.i8(i8 [[M1]], i8 42)
 ; CHECK-NEXT:    ret i8 [[M2]]
 ;
   %m1 = call i8 @llvm.umax.i8(i8 %x, i8 42)
@@ -2292,8 +2292,8 @@
 
 define <3 x i8> @umin_umin_reassoc_constant_sink(<3 x i8> %x, <3 x i8> %y) {
 ; CHECK-LABEL: @umin_umin_reassoc_constant_sink(
-; CHECK-NEXT:    [[M1:%.*]] = call <3 x i8> @llvm.umin.v3i8(<3 x i8> [[X:%.*]], <3 x i8> <i8 43, i8 -43, i8 0>)
-; CHECK-NEXT:    [[M2:%.*]] = call <3 x i8> @llvm.umin.v3i8(<3 x i8> [[M1]], <3 x i8> [[Y:%.*]])
+; CHECK-NEXT:    [[M1:%.*]] = call <3 x i8> @llvm.umin.v3i8(<3 x i8> [[X:%.*]], <3 x i8> [[Y:%.*]])
+; CHECK-NEXT:    [[M2:%.*]] = call <3 x i8> @llvm.umin.v3i8(<3 x i8> [[M1]], <3 x i8> <i8 43, i8 -43, i8 0>)
 ; CHECK-NEXT:    ret <3 x i8> [[M2]]
 ;
   %m1 = call <3 x i8> @llvm.umin.v3i8(<3 x i8> %x, <3 x i8> <i8 43, i8 -43, i8 0>)
@@ -2316,9 +2316,8 @@
 
 define i8 @smax_smax_smax_reassoc_constants(i8 %x, i8 %y) {
 ; CHECK-LABEL: @smax_smax_smax_reassoc_constants(
-; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.smax.i8(i8 [[X:%.*]], i8 42)
-; CHECK-NEXT:    [[M2:%.*]] = call i8 @llvm.smax.i8(i8 [[Y:%.*]], i8 [[M1]])
-; CHECK-NEXT:    [[M3:%.*]] = call i8 @llvm.smax.i8(i8 [[M2]], i8 126)
+; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.smax.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[M3:%.*]] = call i8 @llvm.smax.i8(i8 [[M1]], i8 126)
 ; CHECK-NEXT:    ret i8 [[M3]]
 ;
   %m1 = call i8 @llvm.smax.i8(i8 %x, i8 42)
@@ -2329,9 +2328,8 @@
 
 define i8 @smax_smax_smax_reassoc_constants_swap(i8 %x, i8 %y) {
 ; CHECK-LABEL: @smax_smax_smax_reassoc_constants_swap(
-; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.smax.i8(i8 [[X:%.*]], i8 42)
-; CHECK-NEXT:    [[M2:%.*]] = call i8 @llvm.smax.i8(i8 [[M1]], i8 [[Y:%.*]])
-; CHECK-NEXT:    [[M3:%.*]] = call i8 @llvm.smax.i8(i8 [[M2]], i8 126)
+; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.smax.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[M3:%.*]] = call i8 @llvm.smax.i8(i8 [[M1]], i8 126)
 ; CHECK-NEXT:    ret i8 [[M3]]
 ;
   %m1 = call i8 @llvm.smax.i8(i8 %x, i8 42)
@@ -2342,10 +2340,9 @@
 
 define i8 @smin_smin_smin_reassoc_constants(i8 %x, i8 %y) {
 ; CHECK-LABEL: @smin_smin_smin_reassoc_constants(
-; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.smin.i8(i8 [[X:%.*]], i8 42)
-; CHECK-NEXT:    [[M2:%.*]] = call i8 @llvm.smin.i8(i8 [[Y:%.*]], i8 [[M1]])
-; CHECK-NEXT:    [[M3:%.*]] = call i8 @llvm.smin.i8(i8 [[M2]], i8 126)
-; CHECK-NEXT:    ret i8 [[M3]]
+; CHECK-NEXT:    [[M1:%.*]] = call i8 @llvm.smin.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[M2:%.*]] = call i8 @llvm.smin.i8(i8 [[M1]], i8 42)
+; CHECK-NEXT:    ret i8 [[M2]]
 ;
   %m1 = call i8 @llvm.smin.i8(i8 %x, i8 42)
   %m2 = call i8 @llvm.smin.i8(i8 %y, i8 %m1)