Improve __builtin_nanf support; we now can deal with them as constants.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72607 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index d0d8b81..eac73ea 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -18,6 +18,8 @@
#include "clang/AST/ASTDiagnostic.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/Support/Compiler.h"
+#include <cstring>
+
using namespace clang;
using llvm::APSInt;
using llvm::APFloat;
@@ -1311,14 +1313,23 @@
case Builtin::BI__builtin_nan:
case Builtin::BI__builtin_nanf:
case Builtin::BI__builtin_nanl:
- // If this is __builtin_nan("") turn this into a simple nan, otherwise we
+ // If this is __builtin_nan() turn this into a nan, otherwise we
// can't constant fold it.
if (const StringLiteral *S =
dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenCasts())) {
- if (!S->isWide() && S->getByteLength() == 0) { // empty string.
+ if (!S->isWide()) {
const llvm::fltSemantics &Sem =
Info.Ctx.getFloatTypeSemantics(E->getType());
- Result = llvm::APFloat::getNaN(Sem);
+ char *s = (char *)malloc (S->getByteLength()+1);
+ memcpy(s, S->getStrData(), S->getByteLength());
+ s[S->getByteLength()] = 0;
+ long l;
+ char *endp;
+ l = strtol(S->getStrData(), &endp, 0);
+ if (endp != (S->getStrData() + S->getByteLength()))
+ return false;
+ unsigned type = (unsigned int)l;;
+ Result = llvm::APFloat::getNaN(Sem, false, type);
return true;
}
}