[libcxx][test][z/OS] Fix hermite.pass.cpp for HEX float

[zibi2]

The HEX float on z/OS does not have infinity nor NaN. In addition, the limits are smaller before the overflow occurs in mathematical calculations. This PR accounts for this.

FYI, this LIT test was recently added in PR 89982

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Zibi Sarbinowski (zibi2)

Changes

The HEX float on z/OS does not have infinity nor NaN. In addition, the limits are smaller before the overflow occurs in mathematical calculations. This PR accounts for this.

FYI, this LIT test was recently added in PR 89982

---

Full diff: https://github.com/llvm/llvm-project/pull/101019.diff

1 Files Affected:

• (modified) libcxx/test/std/numerics/c.math/hermite.pass.cpp (+10-1)

diff --git a/libcxx/test/std/numerics/c.math/hermite.pass.cpp b/libcxx/test/std/numerics/c.math/hermite.pass.cpp
index 08fbd5c3283c1..fb702369ad036 100644
--- a/libcxx/test/std/numerics/c.math/hermite.pass.cpp
+++ b/libcxx/test/std/numerics/c.math/hermite.pass.cpp
@@ -26,7 +26,12 @@
 
 #include "type_algorithms.h"
 
-inline constexpr unsigned g_max_n = 128;
+inline constexpr unsigned g_max_n =
+#if !(defined(__MVS__) && !defined(__BFP__))
+  128;
+#else
+  39;
+#endif
 
 template <class T>
 std::array<T, 11> sample_points() {
@@ -203,6 +208,7 @@ std::vector<T> get_roots(unsigned n) {
 
 template <class Real>
 void test() {
+#if !(defined(__MVS__) && !defined(__BFP__))
   { // checks if NaNs are reported correctly (i.e. output == input for input == NaN)
     using nl = std::numeric_limits<Real>;
     for (Real NaN : {nl::quiet_NaN(), nl::signaling_NaN()})
@@ -215,6 +221,7 @@ void test() {
       for (unsigned n = 0; n < g_max_n; ++n)
         assert(!std::isnan(std::hermite(n, x)));
   }
+#endif
 
   { // checks std::hermite(n, x) for n=0..5 against analytic polynoms
     const auto h0 = [](Real) -> Real { return 1; };
@@ -289,6 +296,7 @@ void test() {
     }
   }
 
+#if !(defined(__MVS__) && !defined(__BFP__))
   { // check input infinity is handled correctly
     Real inf = std::numeric_limits<Real>::infinity();
     for (unsigned n = 1; n < g_max_n; ++n) {
@@ -316,6 +324,7 @@ void test() {
       }
     }
   }
+#endif
 }
 
 struct TestFloat {

[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[abhina-sree]

LGTM

[PaulXiCao]

LGTM

[PaulXiCao]

@zibi2 Thanks for finding and solving this issue! 👍