Index: llvm/trunk/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
===================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
@@ -441,6 +441,26 @@
       return replaceInstUsesWith(I, Sqrt);
     }
 
+    // exp(X) * exp(Y) -> exp(X + Y)
+    // Match as long as at least one of exp has only one use.
+    if (match(Op0, m_Intrinsic<Intrinsic::exp>(m_Value(X))) &&
+        match(Op1, m_Intrinsic<Intrinsic::exp>(m_Value(Y))) &&
+        (Op0->hasOneUse() || Op1->hasOneUse())) {
+      Value *XY = Builder.CreateFAddFMF(X, Y, &I);
+      Value *Exp = Builder.CreateUnaryIntrinsic(Intrinsic::exp, XY, &I);
+      return replaceInstUsesWith(I, Exp);
+    }
+
+    // exp2(X) * exp2(Y) -> exp2(X + Y)
+    // Match as long as at least one of exp2 has only one use.
+    if (match(Op0, m_Intrinsic<Intrinsic::exp2>(m_Value(X))) &&
+        match(Op1, m_Intrinsic<Intrinsic::exp2>(m_Value(Y))) &&
+        (Op0->hasOneUse() || Op1->hasOneUse())) {
+      Value *XY = Builder.CreateFAddFMF(X, Y, &I);
+      Value *Exp2 = Builder.CreateUnaryIntrinsic(Intrinsic::exp2, XY, &I);
+      return replaceInstUsesWith(I, Exp2);
+    }
+
     // (X*Y) * X => (X*X) * Y where Y != X
     //  The purpose is two-fold:
     //   1) to form a power expression (of X).
Index: llvm/trunk/test/Transforms/InstCombine/fmul-exp.ll
===================================================================
--- llvm/trunk/test/Transforms/InstCombine/fmul-exp.ll
+++ llvm/trunk/test/Transforms/InstCombine/fmul-exp.ll
@@ -21,11 +21,11 @@
 ; exp(a) * exp(b) reassoc, multiple uses
 define double @exp_a_exp_b_multiple_uses(double %a, double %b) {
 ; CHECK-LABEL: @exp_a_exp_b_multiple_uses(
-; CHECK-NEXT:    [[TMP:%.*]] = call double @llvm.exp.f64(double [[A:%.*]])
 ; CHECK-NEXT:    [[TMP1:%.*]] = call double @llvm.exp.f64(double [[B:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[TMP]], [[TMP1]]
+; CHECK-NEXT:    [[TMP:%.*]] = fadd reassoc double [[A:%.*]], [[B]]
+; CHECK-NEXT:    [[TMP2:%.*]] = call reassoc double @llvm.exp.f64(double [[TMP]])
 ; CHECK-NEXT:    call void @use(double [[TMP1]])
-; CHECK-NEXT:    ret double [[MUL]]
+; CHECK-NEXT:    ret double [[TMP2]]
 ;
   %tmp = call double @llvm.exp.f64(double %a)
   %tmp1 = call double @llvm.exp.f64(double %b)
@@ -55,10 +55,9 @@
 ; exp(a) * exp(b) => exp(a+b) with reassoc
 define double @exp_a_exp_b_reassoc(double %a, double %b) {
 ; CHECK-LABEL: @exp_a_exp_b_reassoc(
-; CHECK-NEXT:    [[TMP:%.*]] = call double @llvm.exp.f64(double [[A:%.*]])
-; CHECK-NEXT:    [[TMP1:%.*]] = call double @llvm.exp.f64(double [[B:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[TMP]], [[TMP1]]
-; CHECK-NEXT:    ret double [[MUL]]
+; CHECK-NEXT:    [[TMP:%.*]] = fadd reassoc double [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = call reassoc double @llvm.exp.f64(double [[TMP]])
+; CHECK-NEXT:    ret double [[TMP1]]
 ;
   %tmp = call double @llvm.exp.f64(double %a)
   %tmp1 = call double @llvm.exp.f64(double %b)
@@ -69,14 +68,11 @@
 ; exp(a) * exp(b) * exp(c) * exp(d) => exp(a+b+c+d) with reassoc
 define double @exp_a_exp_b_exp_c_exp_d_fast(double %a, double %b, double %c, double %d) {
 ; CHECK-LABEL: @exp_a_exp_b_exp_c_exp_d_fast(
-; CHECK-NEXT:    [[TMP:%.*]] = call double @llvm.exp.f64(double [[A:%.*]])
-; CHECK-NEXT:    [[TMP1:%.*]] = call double @llvm.exp.f64(double [[B:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[TMP]], [[TMP1]]
-; CHECK-NEXT:    [[TMP2:%.*]] = call double @llvm.exp.f64(double [[C:%.*]])
-; CHECK-NEXT:    [[MUL1:%.*]] = fmul reassoc double [[MUL]], [[TMP2]]
-; CHECK-NEXT:    [[TMP3:%.*]] = call double @llvm.exp.f64(double [[D:%.*]])
-; CHECK-NEXT:    [[MUL2:%.*]] = fmul reassoc double [[MUL1]], [[TMP3]]
-; CHECK-NEXT:    ret double [[MUL2]]
+; CHECK-NEXT:    [[TMP:%.*]] = fadd reassoc double [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = fadd reassoc double [[TMP]], [[C:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = fadd reassoc double [[TMP1]], [[D:%.*]]
+; CHECK-NEXT:    [[TMP3:%.*]] = call reassoc double @llvm.exp.f64(double [[TMP2]])
+; CHECK-NEXT:    ret double [[TMP3]]
 ;
   %tmp = call double @llvm.exp.f64(double %a)
   %tmp1 = call double @llvm.exp.f64(double %b)
Index: llvm/trunk/test/Transforms/InstCombine/fmul-exp2.ll
===================================================================
--- llvm/trunk/test/Transforms/InstCombine/fmul-exp2.ll
+++ llvm/trunk/test/Transforms/InstCombine/fmul-exp2.ll
@@ -21,11 +21,11 @@
 ; exp2(a) * exp2(b) reassoc, multiple uses
 define double @exp2_a_exp2_b_multiple_uses(double %a, double %b) {
 ; CHECK-LABEL: @exp2_a_exp2_b_multiple_uses(
-; CHECK-NEXT:    [[TMP:%.*]] = call double @llvm.exp2.f64(double [[A:%.*]])
 ; CHECK-NEXT:    [[TMP1:%.*]] = call double @llvm.exp2.f64(double [[B:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[TMP]], [[TMP1]]
+; CHECK-NEXT:    [[TMP:%.*]] = fadd reassoc double [[A:%.*]], [[B]]
+; CHECK-NEXT:    [[TMP2:%.*]] = call reassoc double @llvm.exp2.f64(double [[TMP]])
 ; CHECK-NEXT:    call void @use(double [[TMP1]])
-; CHECK-NEXT:    ret double [[MUL]]
+; CHECK-NEXT:    ret double [[TMP2]]
 ;
   %tmp = call double @llvm.exp2.f64(double %a)
   %tmp1 = call double @llvm.exp2.f64(double %b)
@@ -55,10 +55,9 @@
 ; exp2(a) * exp2(b) => exp2(a+b) with reassoc
 define double @exp2_a_exp2_b_reassoc(double %a, double %b) {
 ; CHECK-LABEL: @exp2_a_exp2_b_reassoc(
-; CHECK-NEXT:    [[TMP:%.*]] = call double @llvm.exp2.f64(double [[A:%.*]])
-; CHECK-NEXT:    [[TMP1:%.*]] = call double @llvm.exp2.f64(double [[B:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[TMP]], [[TMP1]]
-; CHECK-NEXT:    ret double [[MUL]]
+; CHECK-NEXT:    [[TMP:%.*]] = fadd reassoc double [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = call reassoc double @llvm.exp2.f64(double [[TMP]])
+; CHECK-NEXT:    ret double [[TMP1]]
 ;
   %tmp = call double @llvm.exp2.f64(double %a)
   %tmp1 = call double @llvm.exp2.f64(double %b)
@@ -69,14 +68,11 @@
 ; exp2(a) * exp2(b) * exp2(c) * exp2(d) => exp2(a+b+c+d) with reassoc
 define double @exp2_a_exp2_b_exp2_c_exp2_d(double %a, double %b, double %c, double %d) {
 ; CHECK-LABEL: @exp2_a_exp2_b_exp2_c_exp2_d(
-; CHECK-NEXT:    [[TMP:%.*]] = call double @llvm.exp2.f64(double [[A:%.*]])
-; CHECK-NEXT:    [[TMP1:%.*]] = call double @llvm.exp2.f64(double [[B:%.*]])
-; CHECK-NEXT:    [[MUL:%.*]] = fmul reassoc double [[TMP]], [[TMP1]]
-; CHECK-NEXT:    [[TMP2:%.*]] = call double @llvm.exp2.f64(double [[C:%.*]])
-; CHECK-NEXT:    [[MUL1:%.*]] = fmul reassoc double [[MUL]], [[TMP2]]
-; CHECK-NEXT:    [[TMP3:%.*]] = call double @llvm.exp2.f64(double [[D:%.*]])
-; CHECK-NEXT:    [[MUL2:%.*]] = fmul reassoc double [[MUL1]], [[TMP3]]
-; CHECK-NEXT:    ret double [[MUL2]]
+; CHECK-NEXT:    [[TMP:%.*]] = fadd reassoc double [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[TMP1:%.*]] = fadd reassoc double [[TMP]], [[C:%.*]]
+; CHECK-NEXT:    [[TMP2:%.*]] = fadd reassoc double [[TMP1]], [[D:%.*]]
+; CHECK-NEXT:    [[TMP3:%.*]] = call reassoc double @llvm.exp2.f64(double [[TMP2]])
+; CHECK-NEXT:    ret double [[TMP3]]
 ;
   %tmp = call double @llvm.exp2.f64(double %a)
   %tmp1 = call double @llvm.exp2.f64(double %b)