1 files changed, 78 insertions, 0 deletions
diff --git a/pl/math/math_errf.c b/pl/math/math_errf.c
new file mode 100644
index 0000000..96271ff
--- /dev/null
+++ b/pl/math/math_errf.c
@@ -0,0 +1,78 @@
+/*
+ * Single-precision math error handling.
+ *
+ * Copyright (c) 2017-2023, Arm Limited.
+ * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
+ */
+
+#include "math_config.h"
+
+#if WANT_ERRNO
+#include <errno.h>
+/* NOINLINE reduces code size and avoids making math functions non-leaf
+   when the error handling is inlined.  */
+NOINLINE static float
+with_errnof (float y, int e)
+{
+  errno = e;
+  return y;
+}
+#else
+#define with_errnof(x, e) (x)
+#endif
+
+/* NOINLINE reduces code size.  */
+NOINLINE static float
+xflowf (uint32_t sign, float y)
+{
+  y = eval_as_float (opt_barrier_float (sign ? -y : y) * y);
+  return with_errnof (y, ERANGE);
+}
+
+HIDDEN float
+__math_uflowf (uint32_t sign)
+{
+  return xflowf (sign, 0x1p-95f);
+}
+
+/* Underflows to zero in some non-nearest rounding mode, setting errno
+   is valid even if the result is non-zero, but in the subnormal range.  */
+HIDDEN float
+__math_may_uflowf (uint32_t sign)
+{
+  return xflowf (sign, 0x1.4p-75f);
+}
+
+HIDDEN float
+__math_oflowf (uint32_t sign)
+{
+  return xflowf (sign, 0x1p97f);
+}
+
+HIDDEN float
+__math_divzerof (uint32_t sign)
+{
+  float y = opt_barrier_float (sign ? -1.0f : 1.0f) / 0.0f;
+  return with_errnof (y, ERANGE);
+}
+
+HIDDEN float
+__math_invalidf (float x)
+{
+  float y = (x - x) / (x - x);
+  return isnan (x) ? y : with_errnof (y, EDOM);
+}
+
+/* Check result and set errno if necessary.  */
+
+HIDDEN float
+__math_check_uflowf (float y)
+{
+  return y == 0.0f ? with_errnof (y, ERANGE) : y;
+}
+
+HIDDEN float
+__math_check_oflowf (float y)
+{
+  return isinf (y) ? with_errnof (y, ERANGE) : y;
+}