patch 7.4.1976

Problem:    Number variables are not 64 bits while they could be.
Solution:   Add the num64 feature. (Ken Takata)

runtime/doc/eval.txt

@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 7.4.  Last change: 2016 Jun 06
+*eval.txt*	For Vim version 7.4.  Last change: 2016 Jul 01
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -40,6 +40,8 @@ done, the features in this document are not available.	See |+eval| and
 There are nine types of variables:
 
 Number		A 32 or 64 bit signed number.  |expr-number| *Number*
+		64-bit Number is available only when compiled with the
+		|+num64| feature.
 		Examples:  -123  0x10  0177
 
 Float		A floating point number. |floating-point-format| *Float*
@@ -888,6 +890,11 @@ When dividing a Number by zero the result depends on the value:
 	 <0 / 0  = -0x7fffffff	(like negative infinity)
 	(before Vim 7.2 it was always 0x7fffffff)
 
+When 64-bit Number support is enabled:
+	  0 / 0  = -0x8000000000000000	(like NaN for Float)
+	 >0 / 0  =  0x7fffffffffffffff	(like positive infinity)
+	 <0 / 0  = -0x7fffffffffffffff	(like negative infinity)
+
 When the righthand side of '%' is zero, the result is 0.
 
 None of these work for |Funcref|s.
@@ -3566,17 +3573,19 @@ float2nr({expr})					*float2nr()*
 		decimal point.
 		{expr} must evaluate to a |Float| or a Number.
 		When the value of {expr} is out of range for a |Number| the
-		result is truncated to 0x7fffffff or -0x7fffffff.  NaN results
-		in -0x80000000.
+		result is truncated to 0x7fffffff or -0x7fffffff (or when
+		64-bit Number support is enabled, 0x7fffffffffffffff or
+		-0x7fffffffffffffff.  NaN results in -0x80000000 (or when
+		64-bit Number support is enabled, -0x8000000000000000).
 		Examples: >
 			echo float2nr(3.95)
 <			3  >
 			echo float2nr(-23.45)
 <			-23  >
 			echo float2nr(1.0e100)
-<			2147483647  >
+<			2147483647  (or 9223372036854775807) >
 			echo float2nr(-1.0e150)
-<			-2147483647  >
+<			-2147483647 (or -9223372036854775807) >
 			echo float2nr(1.0e-100)
 <			0
 		{only available when compiled with the |+float| feature}
@@ -7655,7 +7664,10 @@ winwidth({nr})						*winwidth()*
   :if winwidth(0) <= 50
   :  exe "normal 50\<C-W>|"
   :endif
-<
+<               For getting the terminal or screen size, see the 'columns'
+               option.
+
+
 wordcount()						*wordcount()*
 		The result is a dictionary of byte/chars/word statistics for
 		the current buffer.  This is the same info as provided by
@@ -7842,6 +7854,7 @@ multi_lang		Compiled with support for multiple languages.
 mzscheme		Compiled with MzScheme interface |mzscheme|.
 netbeans_enabled	Compiled with support for |netbeans| and connected.
 netbeans_intg		Compiled with support for |netbeans|.
+num64			Compiled with 64-bit |Number| support.
 ole			Compiled with OLE automation support for Win32.
 os2			OS/2 version of Vim.
 packages		Compiled with |packages| support.

runtime/doc/various.txt

@@ -390,6 +390,7 @@ N  *+multi_lang*	non-English language support |multi-lang|
 m  *+mzscheme*		Mzscheme interface |mzscheme|
 m  *+mzscheme/dyn*	Mzscheme interface |mzscheme-dynamic| |/dyn|
 m  *+netbeans_intg*	|netbeans|
+   *+num64*		64-bit Number support |Number|
 m  *+ole*		Win32 GUI only: |ole-interface|
 N  *+packages*		Loading |packages|
 N  *+path_extra*	Up/downwards search in 'path' and 'tags'