1 files changed, 91 insertions, 7 deletions

diff --git a/gl/float.c b/gl/float.c
index a9ea40b0..2e95957a 100644
--- a/gl/float.c
+++ b/gl/float.c
@@ -1,5 +1,5 @@
 /* Auxiliary definitions for <float.h>.
-   Copyright (C) 2011-2024 Free Software Foundation, Inc.
+   Copyright (C) 2011-2026 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2011.
 
    This file is free software: you can redistribute it and/or modify
@@ -20,14 +20,98 @@
 /* Specification.  */
 #include <float.h>
 
-#if (defined _ARCH_PPC || defined _POWER) && (defined _AIX || defined __linux__) && (LDBL_MANT_DIG == 106) && defined __GNUC__
-const union gl_long_double_union gl_LDBL_MAX =
-  { { DBL_MAX, DBL_MAX / (double)134217728UL / (double)134217728UL } };
-#elif defined __i386__
+#if GNULIB_defined_long_double_union
+# ifdef __i386__
 const union gl_long_double_union gl_LDBL_MAX =
   { { 0xFFFFFFFF, 0xFFFFFFFF, 32766 } };
-#else
+# endif
+# if defined __i386__ && (defined __FreeBSD__ || defined __DragonFly__)
+/* We can't even simply evaluate the formula (LDBL_MIN / 9223372036854775808.0L)
+   at run time, because it would require BEGIN_LONG_DOUBLE_ROUNDING /
+   END_LONG_DOUBLE_ROUNDING invocations.  It simpler to just write down the
+   representation of LDBL_TRUE_MIN, based on
+   <https://en.wikipedia.org/wiki/Extended_precision#x86_extended_precision_format>.  */
+const union gl_long_double_union gl_LDBL_TRUE_MIN =
+  { { 0x00000001, 0x00000000, 0 } };
+# endif
+#endif
+
+#if GNULIB_defined_FLT_SNAN
+/* Define like memory_positive_SNaNf(), see signed-snan.h and snan.h,
+   or like setpayloadsigf() with an arbitrary payload.  */
+gl_FLT_SNAN_t gl_FLT_SNAN =
+# if FLT_MANT_DIG == 24
+#  if defined __hppa || (defined __mips__ && !MIPS_NAN2008_FLOAT) || defined __sh__
+  /* sign bit: 0, 8 exponent bits: all 1, next bit: 1, payload: 0b10...0 */
+  { { 0x7FE00000U } }
+#  else
+  /* sign bit: 0, 8 exponent bits: all 1, next bit: 0, payload: 0b10...0 */
+  { { 0x7FA00000U } }
+#  endif
+# endif
+  ;
+#endif
+
+#if GNULIB_defined_DBL_SNAN
+/* Define like memory_positive_SNaNd(), see signed-snan.h and snan.h,
+   or like setpayloadsig() with an arbitrary payload.  */
+gl_DBL_SNAN_t gl_DBL_SNAN =
+# if DBL_MANT_DIG == 53
+#  if defined __hppa || (defined __mips__ && !MIPS_NAN2008_FLOAT) || defined __sh__
+  /* sign bit: 0, 11 exponent bits: all 1, next bit: 1, payload: 0b10...0 */
+  { { 0x7FFC000000000000ULL } }
+#  else
+  /* sign bit: 0, 11 exponent bits: all 1, next bit: 0, payload: 0b10...0 */
+  { { 0x7FF4000000000000ULL } }
+#  endif
+# endif
+  ;
+#endif
+
+#if GNULIB_defined_LDBL_SNAN
+# ifdef WORDS_BIGENDIAN
+#  define TWO(hi,lo) { hi, lo }
+# else
+#  define TWO(hi,lo) { lo, hi }
+# endif
+/* Define like memory_positive_SNaNl(), see signed-snan.h and snan.h,
+   or like setpayloadsigl() with an arbitrary payload.  */
+gl_LDBL_SNAN_t gl_LDBL_SNAN =
+# if LDBL_MANT_DIG == 53 /* on arm, hppa, mips, sh, but also MSVC */
+#  if defined __hppa || (defined __mips__ && !MIPS_NAN2008_FLOAT) || defined __sh__
+  /* sign bit: 0, 11 exponent bits: all 1, next bit: 1, payload: 0b10...0 */
+  { { 0x7FFC000000000000ULL } }
+#  else
+  /* sign bit: 0, 11 exponent bits: all 1, next bit: 0, payload: 0b10...0 */
+  { { 0x7FF4000000000000ULL } }
+#  endif
+# elif LDBL_MANT_DIG == 64 /* on i386, x86_64, ia64, m68k */
+#  if defined __m68k__
+  /* sign bit: 0, 15 exponent bits: all 1, 16 gap bits: all 0,
+     always=1 bit: 1, next bit: 0, payload: 0b10...0 */
+  { { 0x7FFF0000ULL, 0xA0000000ULL, 0x00000000ULL } }
+#  else
+  /* sign bit: 0, 15 exponent bits: all 1, always=1 bit: 1, next bit: 0, payload: 0b10...0
+     (see <https://en.wikipedia.org/wiki/Extended_precision#x86_extended_precision_format>) */
+  { TWO (0x00007FFFULL, 0xA000000000000000ULL) }
+#  endif
+# elif LDBL_MANT_DIG == 106 /* on powerpc, powerpc64, powerpc64le */
+  /* most-significant double:
+     sign bit: 0, 11 exponent bits: all 1, next bit: 0, payload: 0b10...0,
+     least-significant double: 0.0 */
+  { { 0x7FF4000000000000ULL, 0ULL } }
+# elif LDBL_MANT_DIG == 113 /* on alpha, arm64, loongarch64, mips64, riscv64, s390x, sparc64 */
+#  if (defined __mips__ && !MIPS_NAN2008_FLOAT)
+  /* sign bit: 0, 15 exponent bits: all 1, next bit: 1, payload: 0b10...0 */
+  { TWO (0x7FFFC00000000000ULL, 0ULL) }
+#  else
+  /* sign bit: 0, 15 exponent bits: all 1, next bit: 0, payload: 0b10...0 */
+  { TWO (0x7FFF400000000000ULL, 0ULL) }
+#  endif
+# endif
+  ;
+#endif
+
 /* This declaration is solely to ensure that after preprocessing
    this file is never empty.  */
 typedef int dummy;
-#endif