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Fix IntegerUtil#getDivisorNumbers

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Use unsigned mod operation for initialization of anc

Also includes
- 5a0cefb45e
- acc8ed9634
This commit is contained in:
Spottedleaf
2023-06-16 09:05:36 -07:00
parent 2d788fba60
commit 3cfd74da9e
3 changed files with 59 additions and 8 deletions
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23
patches/server/Rewrite-dataconverter-system.patch
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@@ -1055,6 +1055,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ public static final int V1_20_PRE6 = 3460;
+ public static final int V1_20_PRE7 = 3461;
+ public static final int V1_20_RC1 = 3462;
+ public static final int V1_20 = 3463;
+ public static final int V1_20_1_RC1 = 3464;
+ public static final int V1_20_1 = 3465;
+
+}
diff --git a/src/main/java/ca/spottedleaf/dataconverter/minecraft/converters/advancements/ConverterAbstractAdvancementsRename.java b/src/main/java/ca/spottedleaf/dataconverter/minecraft/converters/advancements/ConverterAbstractAdvancementsRename.java
@@ -23373,7 +23376,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ }
+
+ public static long getDivisorNumbers(final int d) {
+ final int ad = Math.abs(d);
+ final int ad = branchlessAbs(d);
+
+ if (ad < 2) {
+ throw new IllegalArgumentException("|number| must be in [2, 2^31 -1], not: " + d);
@@ -23382,6 +23385,22 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ final int two31 = 0x80000000;
+ final long mask = 0xFFFFFFFFL; // mask for enforcing unsigned behaviour
+
+ /*
+ Signed usage:
+ int number;
+ long magic = getDivisorNumbers(div);
+ long mul = magic >>> 32;
+ int sign = number >> 31;
+ int result = (int)(((long)number * mul) >>> magic) - sign;
+ */
+ /*
+ Unsigned usage:
+ int number;
+ long magic = getDivisorNumbers(div);
+ long mul = magic >>> 32;
+ int result = (int)(((long)number * mul) >>> magic);
+ */
+
+ int p = 31;
+
+ // all these variables are UNSIGNED!
@@ -23414,7 +23433,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ if (d < 0) {
+ magicNum = -magicNum;
+ }
+ int shift = p - 32;
+ int shift = p;
+ return ((long)magicNum << 32) | shift;
+ }
+