diff --git a/lib/Transforms/Utils/SimplifyLibCalls.cpp b/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 91c56c2e231..94decae8562 100644
--- a/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -2273,7 +2273,6 @@ void LibCallSimplifier::replaceAllUsesWith(Instruction *I, Value *With) {
 //   * lround(cnst) -> cnst'
 //
 // pow, powf, powl:
-//   * pow(exp(x),y)  -> exp(x*y)
 //   * pow(sqrt(x),y) -> pow(x,y*0.5)
 //   * pow(pow(x,y),z)-> pow(x,y*z)
 //
@@ -2289,9 +2288,6 @@ void LibCallSimplifier::replaceAllUsesWith(Instruction *I, Value *With) {
 //   * sqrt(Nroot(x)) -> pow(x,1/(2*N))
 //   * sqrt(pow(x,y)) -> pow(|x|,y*0.5)
 //
-// tan, tanf, tanl:
-//   * tan(atan(x)) -> x
-//
 // trunc, truncf, truncl:
 //   * trunc(cnst) -> cnst'
 //