From e9dc83904a5df2c24cc62004be16cecdaea83797 Mon Sep 17 00:00:00 2001
From: kramm <kramm>
Date: Sat, 10 Sep 2005 12:30:01 +0000
Subject: [PATCH] dump out a warning if there's an overflow during matrix
 multiplication

---
 lib/modules/swftools.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/modules/swftools.c b/lib/modules/swftools.c
index 5f16339..37c8e8b 100644
--- a/lib/modules/swftools.c
+++ b/lib/modules/swftools.c
@@ -26,8 +26,11 @@
 #define S64 long long
 SFIXED RFXSWF_SP(SFIXED a1,SFIXED a2,SFIXED b1,SFIXED b2)
 { S64 a;
-  a = (S64)a1*(S64)b1+(S64)a2*(S64)b2;
-  return (SFIXED)(a>>16);
+  a = ((S64)a1*(S64)b1+(S64)a2*(S64)b2)>>16;
+  SFIXED result = (SFIXED)(a);
+  if(a!=result) 
+      fprintf(stderr, "Warning: overflow in matrix multiplication");
+  return result;
 }
 SFIXED RFXSWF_QFIX(int zaehler,int nenner) // bildet Quotient von zwei INTs in SFIXED
 { S64 z = zaehler<<16;
-- 
1.7.10.4