From: Aaron Taylor <ataylor@subgeniuskitty.com>
Date: Wed, 31 Jul 2019 21:38:15 +0000 (-0700)
Subject: Updated `printmagnitudeofnumber` to handle most negative number.
X-Git-Url: http://git.subgeniuskitty.com/vvhitespace/.git/commitdiff_plain/acd78c53d4da91c43e1060f22e73a4c8e8ab3b19

Updated `printmagnitudeofnumber` to handle most negative number.
---

diff --git a/stdlib/stdio.pvvs b/stdlib/stdio.pvvs
index 54bb2ac..8637d67 100644
--- a/stdlib/stdio.pvvs
+++ b/stdlib/stdio.pvvs
@@ -97,8 +97,17 @@ NTN                     | RTS
 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
 #include <math.pvvs>
 NSSVTSSSSTTN            | Mark: 1000011 (print magnitude of number from stack)
-NSTTSSSTN               | JSR > 10001 (absolute value)
 
+@ Catch -(2^63) as a special case since its absolute value will overflow
+@ a twos-complement 64-bit word.
+SNS                     | DUP
+SSTTSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSN | -(2^63)
+TSST                    | SUBTRACT
+NTSSTSSSSTTSSSSSSTSN    | BRZ > 01000011 00000010
+
+@ No special case applies. Prepare for computation by converting the number
+@ to absolute value and preparing a string on the stack.
+NSTTSSSTN               | JSR > 10001 (absolute value)
 SSSSN                   | PUSH ASCII '\0'
 SNT                     | SWAP
 
@@ -126,6 +135,12 @@ SNN                     | DROP
 NSTTSSSTSSN             | JSR > 1000100 (print string from stack)
 NTN                     | RTS
 
+@ Replace the number on the stack with its decimal ASCII representation.
+NSSVSTSSSSTTSSSSSSTSN   | BRZ > 01000011 00000010
+SNN                     | DROP
+A"-9223372036854775808"
+NSNSTSSSSTTSSSSSSSTN    | JMP > 01000011 00000001
+
 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
 @ Name:
 @   printf