diff options
Diffstat (limited to 'llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp index 47e587fab7b..83afb1a65ac 100644 --- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp +++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp @@ -1322,6 +1322,15 @@ Value *LibCallSimplifier::optimizeLog(CallInst *CI, IRBuilder<> &B) { return B.CreateFMul(OpC->getArgOperand(1), EmitUnaryFloatFnCall(OpC->getOperand(0), Callee->getName(), B, Callee->getAttributes()), "mul"); + + // log(exp2(y)) -> y*log(2) + if (F && Name == "log" && TLI->getLibFunc(F->getName(), Func) && + TLI->has(Func) && Func == LibFunc::exp2) + return B.CreateFMul( + OpC->getArgOperand(0), + EmitUnaryFloatFnCall(ConstantFP::get(CI->getType(), 2.0), + Callee->getName(), B, Callee->getAttributes()), + "logmul"); return Ret; } @@ -2301,7 +2310,6 @@ void LibCallSimplifier::replaceAllUsesWith(Instruction *I, Value *With) { // log, logf, logl: // * log(exp(x)) -> x // * log(exp(y)) -> y*log(e) -// * log(exp2(y)) -> y*log(2) // * log(exp10(y)) -> y*log(10) // * log(sqrt(x)) -> 0.5*log(x) // |
