From b68c599a1231c4d11ec0b0a667ce0c407c357eab Mon Sep 17 00:00:00 2001
From: Nicholas Clark <nick@ccl4.org>
Date: Wed, 23 Jan 2008 09:18:41 +0000
Subject: Fix the misplaced warnings and failing tests caused by the precision
 loss warning on ++ and -- by moving the check to Configure time, creating a
 new config.sh variable nv_overflows_integers_at which contains an constant
 expression for the value of the NV which can't be incremented by 1.0

p4raw-id: //depot/perl@33049
---
 Porting/Glossary  | 5 +++++
 Porting/config.sh | 1 +
 Porting/config_H  | 7 +++++++
 3 files changed, 13 insertions(+)

(limited to 'Porting')

diff --git a/Porting/Glossary b/Porting/Glossary
index a457ed5b32..42d75a14ef 100644
--- a/Porting/Glossary
+++ b/Porting/Glossary
@@ -3799,6 +3799,11 @@ nv_preserves_uv_bits (perlxv.U):
 	This variable indicates how many of bits type uvtype
 	a variable nvtype can preserve.
 
+nv_overflows_integers_at (perlxv.U):
+	This variable gives the largest integer value that NVs can hold
+	as a constant floating point expression.
+	If it could not be determined, it holds the value 0.
+
 nveformat (perlxvf.U):
 	This variable contains the format string used for printing
 	a Perl NV using %e-ish floating point format.
diff --git a/Porting/config.sh b/Porting/config.sh
index b20a656f6f..eb9ab0192a 100644
--- a/Porting/config.sh
+++ b/Porting/config.sh
@@ -824,6 +824,7 @@ nroff='nroff'
 nvEUformat='"E"'
 nvFUformat='"F"'
 nvGUformat='"G"'
+nv_overflows_integers_at='256.0*256.0*256.0*256.0*256.0*256.0*2.0*2.0*2.0*2.0*2.0'
 nv_preserves_uv_bits='53'
 nveformat='"e"'
 nvfformat='"f"'
diff --git a/Porting/config_H b/Porting/config_H
index 2540a14d8e..f74dc6714d 100644
--- a/Porting/config_H
+++ b/Porting/config_H
@@ -4271,6 +4271,12 @@
  *	This symbol contains the number of bits a variable of type NVTYPE
  *	can preserve of a variable of type UVTYPE.
  */
+/* NV_OVERFLOWS_INTEGERS_AT
+ *	This symbol gives the largest integer value that NVs can hold. This
+ *	value + 1.0 cannot be stored accurately. It is expressed as constant
+ *	floating point expression to reduce the chance of decimale/binary
+ *	conversion issues. If it can not be determined, the value 0 is given.
+ */
 /* 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.
@@ -4303,6 +4309,7 @@
 #define	NVSIZE		8		/**/
 #undef	NV_PRESERVES_UV
 #define	NV_PRESERVES_UV_BITS	53
+#define	NV_OVERFLOWS_INTEGERS_AT	256.0*256.0*256.0*256.0*256.0*256.0*2.0*2.0*2.0*2.0*2.0
 #define	NV_ZERO_IS_ALLBITS_ZERO
 #if UVSIZE == 8
 #   ifdef BYTEORDER
-- 
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