From 4db5192579aae1c1c9a8dded342a744d6c76666b Mon Sep 17 00:00:00 2001
From: Gabriel Tofvesson <gabto095@student.liu.se>
Date: Fri, 19 Apr 2019 19:40:32 +0200
Subject: [PATCH] Implement optimized bucket-sort (1100 cycles)

---
 sort2.uc | 198 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 198 insertions(+)
 create mode 100644 sort2.uc

diff --git a/sort2.uc b/sort2.uc
new file mode 100644
index 0000000..f6f679c
--- /dev/null
+++ b/sort2.uc
@@ -0,0 +1,198 @@
+#define LIST_START 0xE0
+#define HASH_MASK 0b1111000
+#define NEGATIVE_START 0x40
+#define NEGATIVE_END 0x78
+#define POSITIVE_START 0x00
+#define POSITIVE_END 0x38
+#define BUCKET_SIZE 8
+
+
+// Set up buckets (with absolute sizes)
+// Bucket count: 16
+// Bucket size: 8
+// Motivation: direct mapping from hash to bucket at the cost of bucket size (-6 per bucket)
+#data 0x00 0x00 // 0 (POSITIVE)
+#data 0x08 0x00 // 1 (POSITIVE)
+#data 0x10 0x00 // 2 (POSITIVE)
+#data 0x18 0x00 // 3 (POSITIVE)
+#data 0x20 0x00 // 4 (POSITIVE)
+#data 0x28 0x00 // 5 (POSITIVE)
+#data 0x30 0x00 // 6 (POSITIVE)
+#data 0x38 0x00 // 7 (POSITIVE)
+#data 0x40 0x00 // 8 (NEGATIVE)
+#data 0x48 0x00 // 9 (NEGATIVE)
+#data 0x50 0x00 // A (NEGATIVE)
+#data 0x58 0x00 // B (NEGATIVE)
+#data 0x60 0x00 // C (NEGATIVE)
+#data 0x68 0x00 // D (NEGATIVE)
+#data 0x70 0x00 // E (NEGATIVE)
+#data 0x78 0x00 // F (NEGATIVE)
+
+
+
+// Initialize PC to point at list
+const LIST_START
+mov ar pc
+
+
+$BUCKET_SORT_START
+
+// AR = PM[PC]
+// HR = PM[PC + 1]
+mov pc asr
+mov pc ir; incpc
+mov pm ar
+mov pc asr
+mov pm hr
+
+// Hash HR, partially hash AR.
+// Result of HR-hash is in AR
+// Result of AR-hash is in HR
+brl; mov hr gr
+brl
+brl
+brl
+brl
+brl
+brl
+and HASH_MASK
+
+mov ar asr
+mov pm lc; mov pm pc
+incpc
+mov pc pm
+mov ar pc
+
+$FIRST_INSERTION
+
+incpc; bls @FIRST_INSERTION_END_BIGGEST
+
+mov pc asr
+mov pm ar
+sub gr
+adn gr; brn @FIRST_INSERTION_BOTTOM
+
+mov gr pm; incpc
+
+$FIRST_INSERTION_SHIFT
+mov pc asr; bls @FIRST_INSERTION_END_NOTBIGGEST
+mov pm gr
+mov ar pm
+mov gr ar; declc; incpc; bra @FIRST_INSERTION_SHIFT
+
+$FIRST_INSERTION_BOTTOM
+declc; bra @FIRST_INSERTION
+
+$FIRST_INSERTION_END_BIGGEST
+mov pc asr
+mov gr pm
+
+$FIRST_INSERTION_END_NOTBIGGEST
+
+// Prepare second insertion (minimal bookkeeping)
+mov hr ar
+and HASH_MASK
+mov ar asr
+mov pm pc; mov pm lc
+incpc
+mov pc pm
+mov ar pc
+mov ir asr
+mov pm gr
+
+
+
+$SECOND_INSERTION
+
+incpc; bls @SECOND_INSERTION_END_BIGGEST
+
+mov pc asr
+mov pm ar
+sub gr
+adn gr; brn @SECOND_INSERTION_BOTTOM
+
+mov gr pm; incpc
+
+$SECOND_INSERTION_SHIFT
+mov pc asr; bls @SECOND_INSERTION_END_NOTBIGGEST
+mov pm gr
+mov ar pm
+mov gr ar; declc; incpc; bra @SECOND_INSERTION_SHIFT
+
+$SECOND_INSERTION_BOTTOM
+declc; bra @SECOND_INSERTION
+
+$SECOND_INSERTION_END_BIGGEST
+mov pc asr
+mov gr pm
+
+$SECOND_INSERTION_END_NOTBIGGEST
+mov ir ar; mov ir pc
+sub 0xFE
+brz @BUCKET_SORT_END; incpc
+bra @BUCKET_SORT_START; incpc
+
+$BUCKET_SORT_END
+
+
+
+const NEGATIVE_END
+mov ar hr
+const NEGATIVE_START
+mov ar pc
+const LIST_START
+
+$NEGATIVE_MERGE
+mov pc ir
+mov pc asr; incpc
+mov pm lc
+$NEGATIVE_MERGE_MOVE
+mov pc asr; bls @NEGATIVE_MERGE_BOTTOM
+mov pm gr
+mov ar asr
+add 1
+mov gr pm; declc; incpc; bra @NEGATIVE_MERGE_MOVE
+
+$NEGATIVE_MERGE_BOTTOM
+mov ar gr
+mov ir ar
+sub hr
+adn hr; brz @POSITIVE_MERGE_INIT
+add BUCKET_SIZE
+mov ar pc
+mov gr ar; bra @NEGATIVE_MERGE
+
+
+
+
+$POSITIVE_MERGE_INIT
+const POSITIVE_END
+mov ar hr
+const POSITIVE_START
+mov ar pc
+mov gr ar   // Pop AR
+
+$POSITIVE_MERGE
+mov pc ir
+mov pc asr; incpc
+mov pm lc
+$POSITIVE_MERGE_MOVE
+mov pc asr; bls @POSITIVE_MERGE_BOTTOM
+mov pm gr
+mov ar asr
+add 1
+mov gr pm; declc; incpc; bra @POSITIVE_MERGE_MOVE
+
+$POSITIVE_MERGE_BOTTOM
+mov ar gr
+mov ir ar
+sub hr
+adn hr; brz @PROGRAM_END
+add BUCKET_SIZE
+mov ar pc
+mov gr ar; bra @POSITIVE_MERGE
+
+
+$PROGRAM_END
+$BREAK
+halt