Attempt to support platforms which don't have fenv.h.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114196 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp
index 69581ba..c015231 100644
--- a/lib/Analysis/ConstantFolding.cpp
+++ b/lib/Analysis/ConstantFolding.cpp
@@ -30,6 +30,7 @@
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/MathExtras.h"
+#include "llvm/System/FEnv.h"
#include <cerrno>
#include <cmath>
#include <fenv.h>
@@ -1040,13 +1041,10 @@
static Constant *ConstantFoldFP(double (*NativeFP)(double), double V,
const Type *Ty) {
- feclearexcept(FE_ALL_EXCEPT);
- errno = 0;
+ sys::llvm_fenv_clearexcept();
V = NativeFP(V);
- if (errno != 0 ||
- fetestexcept(FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)) {
- feclearexcept(FE_ALL_EXCEPT);
- errno = 0;
+ if (sys::llvm_fenv_testexcept()) {
+ sys::llvm_fenv_clearexcept();
return 0;
}
@@ -1060,13 +1058,10 @@
static Constant *ConstantFoldBinaryFP(double (*NativeFP)(double, double),
double V, double W, const Type *Ty) {
- feclearexcept(FE_ALL_EXCEPT);
- errno = 0;
+ sys::llvm_fenv_clearexcept();
V = NativeFP(V, W);
- if (errno != 0 ||
- fetestexcept(FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)) {
- feclearexcept(FE_ALL_EXCEPT);
- errno = 0;
+ if (sys::llvm_fenv_testexcept()) {
+ sys::llvm_fenv_clearexcept();
return 0;
}