aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--test/TestSignAlgorithm.pas58
1 files changed, 58 insertions, 0 deletions
diff --git a/test/TestSignAlgorithm.pas b/test/TestSignAlgorithm.pas
new file mode 100644
index 00000000..915e5681
--- /dev/null
+++ b/test/TestSignAlgorithm.pas
@@ -0,0 +1,58 @@
+program TestSignAlgorithm;
+
+uses
+ sysutils;
+
+const
+ a1 = 2;
+ a2 = 1;
+ a3 = 0;
+ a4 = -1;
+ a5 = -2;
+
+var
+ index, number: longint;
+
+begin
+ writeln;
+ writeln ('This tests the arithmetic procedure used in libavutil and libavcodec.');
+ writeln ('positive numbers should give 1, negative numbers -1.');
+ writeln ('-17: ', not((-17 shr 30) and $00000002) + 2);
+ writeln ('-16: ', not((-16 shr 30) and $00000002) + 2);
+ writeln ('-15: ', not((-15 shr 30) and $00000002) + 2);
+ writeln (' -3: ', not(( -3 shr 30) and $00000002) + 2);
+ writeln (' -2: ', not(( -2 shr 30) and $00000002) + 2);
+ writeln (' -1: ', not(( -1 shr 30) and $00000002) + 2);
+ writeln (' 0: ', not(( 0 shr 30) and $00000002) + 2);
+ writeln (' 1: ', not(( 1 shr 30) and $00000002) + 2);
+ writeln (' 2: ', not(( 2 shr 30) and $00000002) + 2);
+ writeln (' 3: ', not(( 3 shr 30) and $00000002) + 2);
+ writeln (' 8: ', not(( 8 shr 30) and $00000002) + 2);
+ writeln ('MaxInt: ', MaxInt:12, ' ', IntToHex(MaxInt,8), ' ', not((MaxInt shr 30) and $00000002) + 2);
+ writeln ('MaxLongint: ', MaxLongint:12, ' ', IntToHex(MaxLongint,8), ' ', not((MaxLongint shr 30) and $00000002) + 2);
+ writeln ('MinInt: ', -MaxInt - 1:12, ' ', IntToHex(-MaxInt - 1,8), ' ', not(((-MaxInt - 1) shr 30) and $00000002) + 2);
+ writeln ('MinLongInt: ', -MaxLongint - 1:12, ' ', IntToHex(-MaxLongint - 1,8), ' ', not(((-MaxLongint - 1) shr 30) and $00000002) + 2);
+ writeln (a1, ' ', IntToHex(a1,8) , ' ', not((a1 shr 30) and $00000002) + 2);
+ writeln (a2, ' ', IntToHex(a2,8) , ' ', not((a2 shr 30) and $00000002) + 2);
+ writeln (a3, ' ', IntToHex(a3,8) , ' ', not((a3 shr 30) and $00000002) + 2);
+ writeln (a4, ' ', IntToHex(a4,8) , ' ', not((a4 shr 30) and $00000002) + 2);
+ writeln (a5, ' ', IntToHex(a5,8) , ' ', not((a5 shr 30) and $00000002) + 2);
+ writeln;
+ writeln ('Hit RETURN for more positive numbers. The last one overflows and becomes negative.');
+ readln;
+ number := 1;
+ for index := 1 to 32 do
+ begin
+ writeln (index:2, ': ', number:11, ' ', IntToHex(number shr 30 ,8):10, ' ', not((number shr 30) and $00000002) + 2);
+ number := number * 2;
+ end;
+ writeln;
+ writeln ('Hit RETURN for more positive numbers.');
+ readln;
+ number := -1;
+ for index := 1 to 32 do
+ begin
+ writeln (index:2, ': ', number:11, ' ', IntToHex(number shr 30 ,8):10, ' ', not((number shr 30) and $00000002) + 2);
+ number := number * 2;
+ end;
+end. \ No newline at end of file