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implement PR9315, constant folding exp2 in terms of pow (since hosts without

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C99 runtimes don't have exp2).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131872 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-05-22 22:22:35 +00:00
parent 1ec11fb8b5
commit 805fa97a0f
2 changed files with 13 additions and 2 deletions
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8
lib/Analysis/ConstantFolding.cpp
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@ -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")