infnan: move the mantbits definitions from perl.h to Configure

Backport of 5a14060af165c24c63cfc5d5f4d2aeb52cc41a03

diff --git a/U/perl/mantbits.U b/U/perl/mantbits.U
index b30a255..af18558 100644 (file)
--- a/U/perl/mantbits.U
+++ b/U/perl/mantbits.U
@@ -5,8 +5,9 @@
 ?RCS: You may distribute under the terms of either the GNU General Public
 ?RCS: License or the Artistic License, as specified in the README file.
 ?RCS:
-?MAKE:longdblmantbits doublemantbits: Inlibc cat Compile run rm_try Setvar \
-       echo i_float i_sunmath d_longdbl longdblkind
+?MAKE:longdblmantbits doublemantbits nvmantbits: Inlibc cat Compile run \
+       rm_try Setvar echo i_float i_sunmath usequadmath \
+       d_longdbl longdblkind nvsize doublesize longdblsize
 ?MAKE:  -pick add $@ %<
 ?S:doublemantbits:
 ?S:    This symbol, if defined, tells how many mantissa bits
@@ -23,6 +24,10 @@
 ?S:    The common x86-style 80-bit long double does not have
 ?S:    an implicit bit.
 ?S:.
+?S:nvmantbits:
+?S:    This variable tells how many bits the mantissa of a Perl NV has,
+?S:    not including the possible implicit bit.
+?S:.
 ?C:DOUBLEMANTBITS:
 ?C:    This symbol, if defined, tells how many mantissa bits
 ?C:    there are in double precision floating point format.
@@ -38,8 +43,14 @@
 ?C:    The common x86-style 80-bit long double does not have
 ?C:    an implicit bit.
 ?C:.
+?C:NVMANTBITS:
+?C:    This symbol, if defined, tells how many mantissa bits
+?C:    (not including implicit bit) there are in a Perl NV.
+?C:    This depends on which floating point type was chosen.
+?C:.
 ?H:#define DOUBLEMANTBITS  $doublemantbits
 ?H:#define LONGDBLMANTBITS $longdblmantbits
+?H:#define NVMANTBITS      $nvmantbits
 ?H:.
 ?F:!try
 : Check the length of the double mantissa
@@ -117,3 +128,19 @@ else
 fi
 $rm_try
 
+: Check the length of the NV mantissa
+$echo "Checking how many mantissa bits your NVs have..." >&4
+if test "X$usequadmath" = "X$define"; then
+  nvmantbits=112 # 128-1-15
+else
+  if test "X$nvsize" = "X$doublesize"; then
+    nvmantbits="$doublemantbits"
+  else
+     if test "X$nvsize" = "X$longdblsize"; then
+       nvmantbits="$longdblmantbits"
+     else
+       nvmantbits="$undef"
+     fi
+  fi
+fi
+