Difference between revisions of "S 002 CDIntToPos"

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(I can't finish this...)
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−
*note: lazy references to "floor" are in respects to the original LBA. "floor 5A00" means, round the original LBA down to a multiple of 5A00 (or discard all binary less than 1 when LBA/5A00)
 
 
  0001efbc: 3c031b4e lui r3,0x1b4e
 
  0001efbc: 3c031b4e lui r3,0x1b4e
−
  0001efc0: 346381b5 ori r3,r3,0x81b5 1/15
+
  0001efc0: 346381b5 ori r3,r3,0x81b5 10/96
−
  0001efc4: 24840096 addiu r4,r4,0x0096 LBA + 0x96 // LBA + 150
+
  0001efc4: 24840096 addiu r4,r4,0x0096 r4 = LBA + 96
−
  0001efc8: 00830018 mult r4,r3 (LBA + 0x96) / f // (LBA + 150) / 15
+
  0001efc8: 00830018 mult r4,r3 (LBA + 96) x 10 / 96
 
  0001efcc: 00a01021 addu r2,r5,r0
 
  0001efcc: 00a01021 addu r2,r5,r0
 
  0001efd0: 3c076666 lui r7,0x6666
 
  0001efd0: 3c076666 lui r7,0x6666
−
  0001efd4: 34e76667 ori r7,r7,0x6667 6/15
+
  0001efd4: 34e76667 ori r7,r7,0x6667 6/f, 2/5
−
  0001efd8: 00041fc3 sra r3,r4,0x1f LBA + 0x96 >> 0x1f //  negative sign (rounding)
+
  0001efd8: 00041fc3 sra r3,r4,0x1f //  negative sign (rounding)
−
  0001efdc: 00003010 mfhi r6 r6 = LBA div'd
+
  0001efdc: 00003010 mfhi r6 r6 = LBA x 10 / 96
 
  0001efe0: 000630c3 sra r6,r6,0x03
 
  0001efe0: 000630c3 sra r6,r6,0x03
−
  0001efe4: 00c33023 subu r6,r6,r3 r6 = LBA div'd / 8 // LBA / 120
+
  0001efe4: 00c33023 subu r6,r6,r3 r6 = LBA x 10 / 4B0
 
  0001efe8: 00062880 sll r5,r6,0x02
 
  0001efe8: 00062880 sll r5,r6,0x02
−
  0001efec: 00a62821 addu r5,r5,r6 r5 = LBA div'd / 8 x 5 // 1/15th LBA x 5 / 8
+
  0001efec: 00a62821 addu r5,r5,r6 r5 = LBA x 50 / 4B0
 
  0001eff0: 00051900 sll r3,r5,0x04
 
  0001eff0: 00051900 sll r3,r5,0x04
−
  0001eff4: 00651823 subu r3,r3,r5 r3 = LBA div'd / 8 x 5 x f // 1/15 x LBA x 75 / 8, LBA x 5/8 rounded to multiples of 120
+
  0001eff4: 00651823 subu r3,r3,r5 r3 = LBA x 4B0 / 4B0
−
  0001eff8: 00832023 subu r4,r4,r3 r4 = LBA x 3/8 floor 78 // LBA - (5/8 x LBA floored to multiples of 120)
+
  0001eff8: 00832023 subu r4,r4,r3 r4 = Mod(LBA,4B0) // Remainer of LBA/1,200
 
  0001effc: 00870018 mult r4,r7
 
  0001effc: 00870018 mult r4,r7
−
  0001f000: 00004010 mfhi r8 r8 = LBA x 3/8 floor 78 x 2/5 // LBA x 3/8 floor 120 x 2/5
+
  0001f000: 00004010 mfhi r8 r8 = LBA x 4B0 / 4B0 x 2/5
 
  0001f004: 3c038888 lui r3,0x8888
 
  0001f004: 3c038888 lui r3,0x8888
−
  0001f008: 34638889 ori r3,r3,0x8889 8/15
+
  0001f008: 34638889 ori r3,r3,0x8889 8/f
 
  0001f00c: 00c30018 mult r6,r3
 
  0001f00c: 00c30018 mult r6,r3
−
  0001f010: 00061fc3 sra r3,r6,0x1f LBA/f (sign) // negative sign (rounding)
+
  0001f010: 00061fc3 sra r3,r6,0x1f // negative sign (rounding)
−
  0001f014: 00004810 mfhi r9 r9 = LBA / E1 // LBA / 225
+
  0001f014: 00004810 mfhi r9 r9 = LBA x 80 / 4650
−
  0001f018: 01264821 addu r9,r9,r6 r9 = LBA x 17 / 708 // LBA x 23 / 1,800
+
  0001f018: 01264821 addu r9,r9,r6 r9 = LBA x 170 / 4650
 
  0001f01c: 00094943 sra r9,r9,0x05
 
  0001f01c: 00094943 sra r9,r9,0x05
−
  0001f020: 01234823 subu r9,r9,r3 r9 = LBA x 17 / 708 >> 0x5 // LBA x 23 / 1,800 / 32
+
  0001f020: 01234823 subu r9,r9,r3 r9 = LBA x 170 / 4650 // and I give up around about here
−
  0001f024: 00091900 sll r3,r9,0x04 r3 = LBA x 17 / 708 >> 0x1* // LBA x 23 / 1,800 / 32 x 16
+
  0001f024: 00091900 sll r3,r9,0x04
−
  0001f028: 00691823 subu r3,r3,r9 // LBA x 368 / 57,600
+
  0001f028: 00691823 subu r3,r3,r9
−
  0001f02c: 00031880 sll r3,r3,0x02 LBA x 17 / E10 floor E100 // LBA x 23 / 3,600 floor 57,600
+
  0001f02c: 00031880 sll r3,r3,0x02
−
  0001f030: 00c33023 subu r6,r6,r3 r6 = LBA / 78 - LBA x 17 / E10 floor E100
+
  0001f030: 00c33023 subu r6,r6,r3
 
  0001f034: 00c70018 mult r6,r7
 
  0001f034: 00c70018 mult r6,r7
−
  0001f038: 00084083 sra r8,r8,0x02 LBA x 3/8 floor 78 x 1/10 // LBA x 3/8 floor 120 x 1/10
+
  0001f038: 00084083 sra r8,r8,0x02
 
  0001f03c: 00041fc3 sra r3,r4,0x1f
 
  0001f03c: 00041fc3 sra r3,r4,0x1f
−
  0001f040: 01034023 subu r8,r8,r3 r8 = LBA x 3/8 floor 78 x 1/10
+
  0001f040: 01034023 subu r8,r8,r3
−
  0001f044: 00081880 sll r3,r8,0x02 LBA x 3/8 floor 78 x 1/5 floor 4 // LBA x 3/8 floor 120 x 1/5 floor 4
+
  0001f044: 00081880 sll r3,r8,0x02
−
  0001f048: 00681821 addu r3,r3,r8 LBA x 3/8 floor 78 x 3/10 floor 4 // LBA x 3/8 floor 120 x 3/10 floor 4
+
  0001f048: 00681821 addu r3,r3,r8
−
  0001f04c: 00031840 sll r3,r3,0x01 r3 = LBA x 3/8 floor 78 x 3/5 floor 8 // LBA x 3/8 floor 120 x 3/5 floor 8
+
  0001f04c: 00031840 sll r3,r3,0x01
−
  0001f050: 00002810 mfhi r5 r5 = LBA / 12c floor 708 - LBA x 17 / 2328 floor 5A00 // LBA / 300 floor 1,800 - LBA x 23 / 9,000 floor 23,040
+
  0001f050: 00002810 mfhi r5
−
  0001f054: 00832023 subu r4,r4,r3 r4 = LBA x 9/28 floor 3c0 // LBA x 9/40 floor 960
+
  0001f054: 00832023 subu r4,r4,r3
 
  0001f058: 00061fc3 sra r3,r6,0x1f
 
  0001f058: 00061fc3 sra r3,r6,0x1f
 
  0001f05c: 01270018 mult r9,r7
 
  0001f05c: 01270018 mult r9,r7
−
  0001f060: 00083900 sll r7,r8,0x04 LBA x 3/8 floor 780 // LBA x 3/8 floor 1,824
+
  0001f060: 00083900 sll r7,r8,0x04
−
  0001f064: 00e43821 addu r7,r7,r4 r7 = LBA x 3/8 floor 780 + LBA x 9/28 floor 3c0 // LBA x 3/8 floor 1,824 + LBA x 9/40 floor 960 (this interpretation may be less helpful moving forward)
+
  0001f064: 00e43821 addu r7,r7,r4
−
  0001f068: 00052883 sra r5,r5,0x02 LBA / 4B0 floor 708 - LBA x 17 / 8CA0 // LBA / 1,200 floor 1,800 - LBA x 17 / 36,000
+
  0001f068: 00052883 sra r5,r5,0x02
 
  0001f06c: 00a32823 subu r5,r5,r3
 
  0001f06c: 00a32823 subu r5,r5,r3
−
  0001f070: 00052100 sll r4,r5,0x04 r4 = LBA / 4B floor 708 - LBA x 17 / 8Ca floor 8CA0 // LBA / 75 floor 1,800 - LBA x 23 / 2,250 floor 36,000
+
  0001f070: 00052100 sll r4,r5,0x04
−
  0001f074: 00051880 sll r3,r5,0x02 r3 = LBA / 12c floor 708 - LBA x 17 / 2328 floor 8CA0 // LBA / 300 floor 1,800 - LBA x 23 / 9,000 floor 36,000
+
  0001f074: 00051880 sll r3,r5,0x02
−
  0001f078: 00651821 addu r3,r3,r5 r3 = LBA / F0 floor 708 - LBA x 17 / 1C20 floor 8CA0 // LBA / 240 floor 1,800 - LBA x 23 / 7,200 floor 36,000
+
  0001f078: 00651821 addu r3,r3,r5
−
  0001f07c: 00031840 sll r3,r3,0x01 r3 = LBA / 78 floor 708 - LBA x 17 / E10 floor 8CA0 // LBA / 120 floor 1,800 - LBA x 23 / 7,200 floor 36,000
+
  0001f07c: 00031840 sll r3,r3,0x01
−
  0001f080: 00c33023 subu r6,r6,r3 r6 = Floor(LBA,708) / 78 - LBA x 17 / E10 floor E100 + LBA x 17 / E10 floor 8CA0 // I can't figure out a good way to simplify this down.
+
  0001f080: 00c33023 subu r6,r6,r3
−
  0001f084: 00862021 addu r4,r4,r6 r4 = LBA / 4B floor 708 - LBA x 17 / 8Ca floor 8CA0 + Floor(LBA,708) / 78 - LBA x 17 / E10 floor E100 - LBA x 17 / E10 floor 8CA0 // something about the 1,800 floors match up here but I can't figure it.
+
  0001f084: 00862021 addu r4,r4,r6
−
  0001f088: a0440001 sb r4,0x0001(r2) Store result to hardware file-loading-address
+
  0001f088: a0440001 sb r4,0x0001(r2) store r4 for GPU to load file
 
  0001f08c: 000927c3 sra r4,r9,0x1f
 
  0001f08c: 000927c3 sra r4,r9,0x1f
−
  0001f090: a0470002 sb r7,0x0002(r2) Store r7 to hardware file-loading-address
+
  0001f090: a0470002 sb r7,0x0002(r2) Store r7 for GPU to load file
−
  0001f094: 00001810 mfhi r3 LBA x 17 / 2 3280 // LBA x 23 / 144,000
+
  0001f094: 00001810 mfhi r3
 
  0001f098: 00031883 sra r3,r3,0x02
 
  0001f098: 00031883 sra r3,r3,0x02
 
  0001f09c: 00641823 subu r3,r3,r4
 
  0001f09c: 00641823 subu r3,r3,r4
Line 65: Line 64:
 
  0001f0b4: 00a92821 addu r5,r5,r9
 
  0001f0b4: 00a92821 addu r5,r5,r9
 
  0001f0b8: 03e00008 jr r31
 
  0001f0b8: 03e00008 jr r31
−
  0001f0bc: a0450000 sb r5,0x0000(r2)
+
  0001f0bc: a0450000 sb r5,0x0000(r2) store r5 for GPU to load file
 
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Revision as of 07:53, 16 March 2023

0001efbc: 3c031b4e lui r3,0x1b4e
0001efc0: 346381b5 ori r3,r3,0x81b5		10/96
0001efc4: 24840096 addiu r4,r4,0x0096		r4 = LBA + 96
0001efc8: 00830018 mult r4,r3			(LBA + 96) x 10 / 96
0001efcc: 00a01021 addu r2,r5,r0
0001efd0: 3c076666 lui r7,0x6666
0001efd4: 34e76667 ori r7,r7,0x6667		6/f, 2/5
0001efd8: 00041fc3 sra r3,r4,0x1f									//  negative sign (rounding)
0001efdc: 00003010 mfhi r6			r6 = LBA x 10 / 96
0001efe0: 000630c3 sra r6,r6,0x03		
0001efe4: 00c33023 subu r6,r6,r3		r6 = LBA x 10 / 4B0
0001efe8: 00062880 sll r5,r6,0x02
0001efec: 00a62821 addu r5,r5,r6		r5 = LBA x 50 / 4B0
0001eff0: 00051900 sll r3,r5,0x04
0001eff4: 00651823 subu r3,r3,r5		r3 = LBA x 4B0 / 4B0
0001eff8: 00832023 subu r4,r4,r3		r4 = Mod(LBA,4B0)					// Remainer of LBA/1,200
0001effc: 00870018 mult r4,r7			
0001f000: 00004010 mfhi r8			r8 = LBA x 4B0 / 4B0 x 2/5
0001f004: 3c038888 lui r3,0x8888
0001f008: 34638889 ori r3,r3,0x8889		8/f
0001f00c: 00c30018 mult r6,r3			
0001f010: 00061fc3 sra r3,r6,0x1f									// negative sign (rounding)
0001f014: 00004810 mfhi r9			r9 = LBA x 80 / 4650 
0001f018: 01264821 addu r9,r9,r6		r9 = LBA x 170 / 4650
0001f01c: 00094943 sra r9,r9,0x05
0001f020: 01234823 subu r9,r9,r3		r9 = LBA x 170 / 4650					// and I give up around about here
0001f024: 00091900 sll r3,r9,0x04
0001f028: 00691823 subu r3,r3,r9		
0001f02c: 00031880 sll r3,r3,0x02		
0001f030: 00c33023 subu r6,r6,r3		
0001f034: 00c70018 mult r6,r7			
0001f038: 00084083 sra r8,r8,0x02		
0001f03c: 00041fc3 sra r3,r4,0x1f
0001f040: 01034023 subu r8,r8,r3		
0001f044: 00081880 sll r3,r8,0x02		
0001f048: 00681821 addu r3,r3,r8		
0001f04c: 00031840 sll r3,r3,0x01		
0001f050: 00002810 mfhi r5			
0001f054: 00832023 subu r4,r4,r3		
0001f058: 00061fc3 sra r3,r6,0x1f
0001f05c: 01270018 mult r9,r7			
0001f060: 00083900 sll r7,r8,0x04		
0001f064: 00e43821 addu r7,r7,r4		
0001f068: 00052883 sra r5,r5,0x02		
0001f06c: 00a32823 subu r5,r5,r3		
0001f070: 00052100 sll r4,r5,0x04		
0001f074: 00051880 sll r3,r5,0x02
0001f078: 00651821 addu r3,r3,r5		
0001f07c: 00031840 sll r3,r3,0x01		
0001f080: 00c33023 subu r6,r6,r3		
0001f084: 00862021 addu r4,r4,r6		
0001f088: a0440001 sb r4,0x0001(r2)		store r4 for GPU to load file
0001f08c: 000927c3 sra r4,r9,0x1f
0001f090: a0470002 sb r7,0x0002(r2)		Store r7 for GPU to load file
0001f094: 00001810 mfhi r3			
0001f098: 00031883 sra r3,r3,0x02		
0001f09c: 00641823 subu r3,r3,r4
0001f0a0: 00032900 sll r5,r3,0x04
0001f0a4: 00032080 sll r4,r3,0x02
0001f0a8: 00832021 addu r4,r4,r3
0001f0ac: 00042040 sll r4,r4,0x01
0001f0b0: 01244823 subu r9,r9,r4
0001f0b4: 00a92821 addu r5,r5,r9
0001f0b8: 03e00008 jr r31
0001f0bc: a0450000 sb r5,0x0000(r2)		store r5 for GPU to load file

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