Index: llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
@@ -564,6 +564,16 @@
         return replaceInstUsesWith(I, NewPow);
       }
 
+      // powi(x, y) * powi(x, z) -> powi(x, y + z)
+      if (match(Op0, m_Intrinsic<Intrinsic::powi>(m_Value(X), m_Value(Y))) &&
+          match(Op1, m_Intrinsic<Intrinsic::powi>(m_Specific(X), m_Value(Z))) &&
+          Y->getType() == Z->getType()) {
+        auto *YZ = Builder.CreateAdd(Y, Z);
+        auto *NewPow = Builder.CreateIntrinsic(
+            Intrinsic::powi, {X->getType(), YZ->getType()}, {X, YZ}, &I);
+        return replaceInstUsesWith(I, NewPow);
+      }
+
       // exp(X) * exp(Y) -> exp(X + Y)
       if (match(Op0, m_Intrinsic<Intrinsic::exp>(m_Value(X))) &&
           match(Op1, m_Intrinsic<Intrinsic::exp>(m_Value(Y)))) {
Index: llvm/test/Transforms/InstCombine/powi.ll
===================================================================
--- llvm/test/Transforms/InstCombine/powi.ll
+++ llvm/test/Transforms/InstCombine/powi.ll
@@ -143,10 +143,9 @@
 define double @powi_fmul_powi(double %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @powi_fmul_powi(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[P1:%.*]] = tail call double @llvm.powi.f64.i32(double [[X:%.*]], i32 [[Y:%.*]])
-; CHECK-NEXT:    [[P2:%.*]] = tail call double @llvm.powi.f64.i32(double [[X]], i32 [[Z:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[P2]], [[P1]]
-; CHECK-NEXT:    ret double [[MUL]]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[Z:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = call reassoc double @llvm.powi.f64.i32(double [[X:%.*]], i32 [[TMP0]])
+; CHECK-NEXT:    ret double [[TMP1]]
 ;
 entry:
   %p1 = tail call double @llvm.powi.f64.i32(double %x, i32 %y)
@@ -158,10 +157,9 @@
 define double @powi_fmul_powi_fast_on_fmul(double %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @powi_fmul_powi_fast_on_fmul(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[P1:%.*]] = tail call double @llvm.powi.f64.i32(double [[X:%.*]], i32 [[Y:%.*]])
-; CHECK-NEXT:    [[P2:%.*]] = tail call double @llvm.powi.f64.i32(double [[X]], i32 [[Z:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul fast double [[P2]], [[P1]]
-; CHECK-NEXT:    ret double [[MUL]]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[Z:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = call fast double @llvm.powi.f64.i32(double [[X:%.*]], i32 [[TMP0]])
+; CHECK-NEXT:    ret double [[TMP1]]
 ;
 entry:
   %p1 = tail call double @llvm.powi.f64.i32(double %x, i32 %y)
@@ -188,10 +186,9 @@
 define double @powi_fmul_powi_same_power(double %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @powi_fmul_powi_same_power(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[P1:%.*]] = tail call double @llvm.powi.f64.i32(double [[X:%.*]], i32 [[Y:%.*]])
-; CHECK-NEXT:    [[P2:%.*]] = tail call double @llvm.powi.f64.i32(double [[X]], i32 [[Y]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[P2]], [[P1]]
-; CHECK-NEXT:    ret double [[MUL]]
+; CHECK-NEXT:    [[TMP0:%.*]] = shl i32 [[Y:%.*]], 1
+; CHECK-NEXT:    [[TMP1:%.*]] = call reassoc double @llvm.powi.f64.i32(double [[X:%.*]], i32 [[TMP0]])
+; CHECK-NEXT:    ret double [[TMP1]]
 ;
 entry:
   %p1 = tail call double @llvm.powi.f64.i32(double %x, i32 %y)
@@ -205,9 +202,9 @@
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[P1:%.*]] = tail call double @llvm.powi.f64.i32(double [[X:%.*]], i32 [[Y:%.*]])
 ; CHECK-NEXT:    tail call void @use(double [[P1]])
-; CHECK-NEXT:    [[P2:%.*]] = tail call double @llvm.powi.f64.i32(double [[X]], i32 [[Z:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[P2]], [[P1]]
-; CHECK-NEXT:    ret double [[MUL]]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[Z:%.*]], [[Y]]
+; CHECK-NEXT:    [[TMP1:%.*]] = call reassoc double @llvm.powi.f64.i32(double [[X]], i32 [[TMP0]])
+; CHECK-NEXT:    ret double [[TMP1]]
 ;
 entry:
   %p1 = tail call double @llvm.powi.f64.i32(double %x, i32 %y)
@@ -222,9 +219,9 @@
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[P1:%.*]] = tail call double @llvm.powi.f64.i32(double [[X:%.*]], i32 [[Z:%.*]])
 ; CHECK-NEXT:    tail call void @use(double [[P1]])
-; CHECK-NEXT:    [[P2:%.*]] = tail call double @llvm.powi.f64.i32(double [[X]], i32 [[Y:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[P2]], [[P1]]
-; CHECK-NEXT:    ret double [[MUL]]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[Y:%.*]], [[Z]]
+; CHECK-NEXT:    [[TMP1:%.*]] = call reassoc double @llvm.powi.f64.i32(double [[X]], i32 [[TMP0]])
+; CHECK-NEXT:    ret double [[TMP1]]
 ;
 entry:
   %p1 = tail call double @llvm.powi.f64.i32(double %x, i32 %z)