Fix FP comparisons when SSE isn't available

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@349387 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/depr/depr.c.headers/math_h.pass.cpp

@@ -14,6 +14,7 @@
 #include <cassert>
 
 #include "hexfloat.h"
+#include "truncate_fp.h"
 
 // convertible to int/float/double/etc
 template <class T, int N=0>
@@ -807,23 +808,31 @@ void test_atanh()
     assert(atanh(0) == 0);
 }
 
-void test_cbrt()
-{
-    static_assert((std::is_same<decltype(cbrt((float)0)), float>::value), "");
-    static_assert((std::is_same<decltype(cbrt((bool)0)), double>::value), "");
-    static_assert((std::is_same<decltype(cbrt((unsigned short)0)), double>::value), "");
-    static_assert((std::is_same<decltype(cbrt((int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(cbrt((unsigned int)0)), double>::value), "");
-    static_assert((std::is_same<decltype(cbrt((long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(cbrt((unsigned long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(cbrt((long long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(cbrt((unsigned long long)0)), double>::value), "");
-    static_assert((std::is_same<decltype(cbrt((double)0)), double>::value), "");
-    static_assert((std::is_same<decltype(cbrt((long double)0)), long double>::value), "");
+void test_cbrt() {
+    static_assert((std::is_same<decltype(cbrt((float) 0)), float>::value), "");
+    static_assert((std::is_same<decltype(cbrt((bool) 0)), double>::value), "");
+    static_assert((std::is_same<decltype(cbrt((unsigned short) 0)),
+                                double>::value), "");
+    static_assert((std::is_same<decltype(cbrt((int) 0)), double>::value), "");
+    static_assert((std::is_same<decltype(cbrt((unsigned int) 0)),
+                                double>::value), "");
+    static_assert((std::is_same<decltype(cbrt((long) 0)), double>::value), "");
+    static_assert((std::is_same<decltype(cbrt((unsigned long) 0)),
+                                double>::value), "");
+    static_assert((std::is_same<decltype(cbrt((long long) 0)), double>::value),
+                  "");
+    static_assert((std::is_same<decltype(cbrt((unsigned long long) 0)),
+                                double>::value), "");
+    static_assert((std::is_same<decltype(cbrt((double) 0)), double>::value),
+                  "");
+    static_assert((std::is_same<decltype(cbrt((long double) 0)),
+                                long double>::value), "");
     static_assert((std::is_same<decltype(cbrtf(0)), float>::value), "");
     static_assert((std::is_same<decltype(cbrtl(0)), long double>::value), "");
-    static_assert((std::is_same<decltype(cbrt(Ambiguous())), Ambiguous>::value), "");
-    assert(cbrt(1) == 1);
+    static_assert((std::is_same<decltype(cbrt(Ambiguous())), Ambiguous>::value),
+                  "");
+    assert(truncate_fp(cbrt(1)) == 1);
+
 }
 
 void test_copysign()

test/std/numerics/c.math/cmath.pass.cpp

@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "hexfloat.h"
+#include "truncate_fp.h"
 
 // convertible to int/float/double/etc
 template <class T, int N=0>
@@ -860,7 +861,7 @@ void test_cbrt()
     static_assert((std::is_same<decltype(std::cbrtf(0)), float>::value), "");
     static_assert((std::is_same<decltype(std::cbrtl(0)), long double>::value), "");
     static_assert((std::is_same<decltype(cbrt(Ambiguous())), Ambiguous>::value), "");
-    assert(std::cbrt(1) == 1);
+    assert(truncate_fp(std::cbrt(1)) == 1);
 }
 
 void test_copysign()

test/std/numerics/rand/rand.util/rand.util.canonical/generate_canonical.pass.cpp

@@ -15,6 +15,8 @@
 #include <random>
 #include <cassert>
 
+#include "truncate_fp.h"
+
 int main()
 {
     {
@@ -22,35 +24,35 @@ int main()
         typedef float F;
         E r;
         F f = std::generate_canonical<F, 0>(r);
-        assert(f == (16807 - E::min()) / (E::max() - E::min() + F(1)));
+        assert(f == truncate_fp((16807 - E::min()) / (E::max() - E::min() + F(1))));
     }
     {
         typedef std::minstd_rand0 E;
         typedef float F;
         E r;
         F f = std::generate_canonical<F, 1>(r);
-        assert(f == (16807 - E::min()) / (E::max() - E::min() + F(1)));
+        assert(f == truncate_fp((16807 - E::min()) / (E::max() - E::min() + F(1))));
     }
     {
         typedef std::minstd_rand0 E;
         typedef float F;
         E r;
         F f = std::generate_canonical<F, std::numeric_limits<F>::digits - 1>(r);
-        assert(f == (16807 - E::min()) / (E::max() - E::min() + F(1)));
+        assert(f == truncate_fp((16807 - E::min()) / (E::max() - E::min() + F(1))));
     }
     {
         typedef std::minstd_rand0 E;
         typedef float F;
         E r;
         F f = std::generate_canonical<F, std::numeric_limits<F>::digits>(r);
-        assert(f == (16807 - E::min()) / (E::max() - E::min() + F(1)));
+        assert(f == truncate_fp((16807 - E::min()) / (E::max() - E::min() + F(1))));
     }
     {
         typedef std::minstd_rand0 E;
         typedef float F;
         E r;
         F f = std::generate_canonical<F, std::numeric_limits<F>::digits + 1>(r);
-        assert(f == (16807 - E::min()) / (E::max() - E::min() + F(1)));
+        assert(f == truncate_fp((16807 - E::min()) / (E::max() - E::min() + F(1))));
     }
 
     {
@@ -58,43 +60,43 @@ int main()
         typedef double F;
         E r;
         F f = std::generate_canonical<F, 0>(r);
-        assert(f == (16807 - E::min()) / (E::max() - E::min() + F(1)));
+        assert(f == truncate_fp((16807 - E::min()) / (E::max() - E::min() + F(1))));
     }
     {
         typedef std::minstd_rand0 E;
         typedef double F;
         E r;
         F f = std::generate_canonical<F, 1>(r);
-        assert(f == (16807 - E::min()) / (E::max() - E::min() + F(1)));
+        assert(f == truncate_fp((16807 - E::min()) / (E::max() - E::min() + F(1))));
     }
     {
         typedef std::minstd_rand0 E;
         typedef double F;
         E r;
         F f = std::generate_canonical<F, std::numeric_limits<F>::digits - 1>(r);
-        assert(f ==
+        assert(f == truncate_fp(
             (16807 - E::min() +
             (282475249 - E::min()) * (E::max() - E::min() + F(1))) /
-            ((E::max() - E::min() + F(1)) * (E::max() - E::min() + F(1))));
+            ((E::max() - E::min() + F(1)) * (E::max() - E::min() + F(1)))));
     }
     {
         typedef std::minstd_rand0 E;
         typedef double F;
         E r;
         F f = std::generate_canonical<F, std::numeric_limits<F>::digits>(r);
-        assert(f ==
+        assert(f == truncate_fp(
             (16807 - E::min() +
             (282475249 - E::min()) * (E::max() - E::min() + F(1))) /
-            ((E::max() - E::min() + F(1)) * (E::max() - E::min() + F(1))));
+            ((E::max() - E::min() + F(1)) * (E::max() - E::min() + F(1)))));
     }
     {
         typedef std::minstd_rand0 E;
         typedef double F;
         E r;
         F f = std::generate_canonical<F, std::numeric_limits<F>::digits + 1>(r);
-        assert(f ==
+        assert(f == truncate_fp(
             (16807 - E::min() +
             (282475249 - E::min()) * (E::max() - E::min() + F(1))) /
-            ((E::max() - E::min() + F(1)) * (E::max() - E::min() + F(1))));
+            ((E::max() - E::min() + F(1)) * (E::max() - E::min() + F(1)))));
     }
 }

test/std/utilities/time/time.duration/time.duration.nonmember/op_divide_duration.pass.cpp

@@ -20,6 +20,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "truncate_fp.h"
 
 int main()
 {
@@ -41,7 +42,7 @@ int main()
     {
     std::chrono::duration<int, std::ratio<2, 3> > s1(30);
     std::chrono::duration<double, std::ratio<3, 5> > s2(5);
-    assert(s1 / s2 == 20./3);
+    assert(s1 / s2 == truncate_fp(20./3));
     }
 #if TEST_STD_VER >= 11
     {

test/support/truncate_fp.h

@@ -0,0 +1,23 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+inline long double truncate_fp(long double val) {
+  volatile long double sink = val;
+  return sink;
+}
+
+inline double truncate_fp(double val) {
+  volatile double sink = val;
+  return sink;
+}
+
+inline float truncate_fp(float val) {
+  volatile float sink = val;
+  return sink;
+}