Support NV_ZERO_IS_ALLBITS_ZERO on Win32 (re: change 24898)

The try.c test program added to Configure by change 24898 outputs
"Yes" using each of VC++, GCC and BCC32, so here goes...

p4raw-id: //depot/perl@24905

8 files changed, 24 insertions, 0 deletions

diff --git a/win32/config.bc b/win32/config.bc
index 5434b33cc7..5b43d2ee85 100644
--- a/win32/config.bc
+++ b/win32/config.bc
@@ -306,6 +306,7 @@ d_nanosleep='undef'
 d_nice='undef'
 d_nl_langinfo='undef'
 d_nv_preserves_uv='define'
+d_nv_zero_is_allbits_zero='define'
 d_off64_t='undef'
 d_old_pthread_create_joinable='undef'
 d_oldpthreads='undef'
diff --git a/win32/config.gc b/win32/config.gc
index f86a4a537e..604fa620ad 100644
--- a/win32/config.gc
+++ b/win32/config.gc
@@ -305,6 +305,7 @@ d_mymalloc='undef'
 d_nice='undef'
 d_nl_langinfo='undef'
 d_nv_preserves_uv='define'
+d_nv_zero_is_allbits_zero='define'
 d_off64_t='undef'
 d_old_pthread_create_joinable='undef'
 d_oldpthreads='undef'
diff --git a/win32/config.vc b/win32/config.vc
index 0baf3f54cf..6c2834afbd 100644
--- a/win32/config.vc
+++ b/win32/config.vc
@@ -305,6 +305,7 @@ d_mymalloc='undef'
 d_nice='undef'
 d_nl_langinfo='undef'
 d_nv_preserves_uv='define'
+d_nv_zero_is_allbits_zero='define'
 d_off64_t='undef'
 d_old_pthread_create_joinable='undef'
 d_oldpthreads='undef'
diff --git a/win32/config.vc64 b/win32/config.vc64
index c45b6bf987..702c539b76 100644
--- a/win32/config.vc64
+++ b/win32/config.vc64
@@ -305,6 +305,7 @@ d_mymalloc='undef'
 d_nice='undef'
 d_nl_langinfo='undef'
 d_nv_preserves_uv='undef'
+d_nv_zero_is_allbits_zero='define'
 d_off64_t='undef'
 d_old_pthread_create_joinable='undef'
 d_oldpthreads='undef'
diff --git a/win32/config_H.bc b/win32/config_H.bc
index 9a8ab4648d..adccb81bf7 100644
--- a/win32/config_H.bc
+++ b/win32/config_H.bc
@@ -3222,6 +3222,10 @@
  *	This symbol contains the number of bits a variable of type NVTYPE
  *	can preserve of a variable of type UVTYPE.
  */
+/* NV_ZERO_IS_ALLBITS_ZERO
+ *	This symbol, if defined, indicates that a variable of type NVTYPE
+ *	stores 0.0 in memory as all bits zero.
+ */
 #define	IVTYPE		long		/**/
 #define	UVTYPE		unsigned long		/**/
 #define	I8TYPE		char		/**/
@@ -3250,6 +3254,7 @@
 #define	NVSIZE		8		/**/
 #define	NV_PRESERVES_UV
 #define	NV_PRESERVES_UV_BITS	32
+#define NV_ZERO_IS_ALLBITS_ZERO
 
 /* IVdf:
  *	This symbol defines the format string used for printing a Perl IV
diff --git a/win32/config_H.gc b/win32/config_H.gc
index 7511a0052b..56ab22a174 100644
--- a/win32/config_H.gc
+++ b/win32/config_H.gc
@@ -3222,6 +3222,10 @@
  *	This symbol contains the number of bits a variable of type NVTYPE
  *	can preserve of a variable of type UVTYPE.
  */
+/* NV_ZERO_IS_ALLBITS_ZERO
+ *	This symbol, if defined, indicates that a variable of type NVTYPE
+ *	stores 0.0 in memory as all bits zero.
+ */
 #define	IVTYPE		long		/**/
 #define	UVTYPE		unsigned long		/**/
 #define	I8TYPE		char		/**/
@@ -3250,6 +3254,7 @@
 #define	NVSIZE		8		/**/
 #define	NV_PRESERVES_UV
 #define	NV_PRESERVES_UV_BITS	32
+#define NV_ZERO_IS_ALLBITS_ZERO
 
 /* IVdf:
  *	This symbol defines the format string used for printing a Perl IV
diff --git a/win32/config_H.vc b/win32/config_H.vc
index 2012c69499..b380158eaa 100644
--- a/win32/config_H.vc
+++ b/win32/config_H.vc
@@ -3222,6 +3222,10 @@
  *	This symbol contains the number of bits a variable of type NVTYPE
  *	can preserve of a variable of type UVTYPE.
  */
+/* NV_ZERO_IS_ALLBITS_ZERO
+ *	This symbol, if defined, indicates that a variable of type NVTYPE
+ *	stores 0.0 in memory as all bits zero.
+ */
 #define	IVTYPE		long		/**/
 #define	UVTYPE		unsigned long		/**/
 #define	I8TYPE		char		/**/
@@ -3250,6 +3254,7 @@
 #define	NVSIZE		8		/**/
 #define	NV_PRESERVES_UV
 #define	NV_PRESERVES_UV_BITS	32
+#define NV_ZERO_IS_ALLBITS_ZERO
 
 /* IVdf:
  *	This symbol defines the format string used for printing a Perl IV
diff --git a/win32/config_H.vc64 b/win32/config_H.vc64
index c996d390fc..a298250490 100644
--- a/win32/config_H.vc64
+++ b/win32/config_H.vc64
@@ -3222,6 +3222,10 @@
  *	This symbol contains the number of bits a variable of type NVTYPE
  *	can preserve of a variable of type UVTYPE.
  */
+/* NV_ZERO_IS_ALLBITS_ZERO
+ *	This symbol, if defined, indicates that a variable of type NVTYPE
+ *	stores 0.0 in memory as all bits zero.
+ */
 #define	IVTYPE		__int64		/**/
 #define	UVTYPE		unsigned __int64		/**/
 #define	I8TYPE		char		/**/
@@ -3250,6 +3254,7 @@
 #define	NVSIZE		8		/**/
 #undef	NV_PRESERVES_UV
 #define	NV_PRESERVES_UV_BITS	53
+#define NV_ZERO_IS_ALLBITS_ZERO
 
 /* IVdf:
  *	This symbol defines the format string used for printing a Perl IV