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Attempt to support platforms which don't have fenv.h.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114196 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-09-17 20:06:27 +00:00
parent 568eeedea7
commit 3f2f21e640
5 changed files with 64 additions and 12 deletions
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19
lib/Analysis/ConstantFolding.cpp
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@@ -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 @@ llvm::canConstantFoldCallTo(const Function *F) {
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 *ConstantFoldFP(double (*NativeFP)(double), double V,
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;
}