From 805fa97a0f5ff61624855da37d4881708fb8f0fb Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 22 May 2011 22:22:35 +0000 Subject: implement PR9315, constant folding exp2 in terms of pow (since hosts without C99 runtimes don't have exp2). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131872 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Analysis/ConstantFolding.cpp | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'lib') diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp index 5de2b04e80..08a6065b31 100644 --- a/lib/Analysis/ConstantFolding.cpp +++ b/lib/Analysis/ConstantFolding.cpp @@ -1085,7 +1085,7 @@ llvm::canConstantFoldCallTo(const Function *F) { case 'c': return Name == "cos" || Name == "ceil" || Name == "cosf" || Name == "cosh"; case 'e': - return Name == "exp"; + return Name == "exp" || Name == "exp2"; case 'f': return Name == "fabs" || Name == "fmod" || Name == "floor"; case 'l': @@ -1221,6 +1221,12 @@ llvm::ConstantFoldCall(Function *F, case 'e': if (Name == "exp") return ConstantFoldFP(exp, V, Ty); + + if (Name == "exp2") { + // Constant fold exp2(x) as pow(2,x) in case the host doesn't have a + // C99 library. + return ConstantFoldBinaryFP(pow, 2.0, V, Ty); + } break; case 'f': if (Name == "fabs") -- cgit v1.2.3-70-g09d2