[dynarmic] Remove last FPT LUT table, removing around 30kb worth of unused functions #3718

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Lizzie merged 2 commits from lizzie/dynarmic-ltu-fpt into master

2026-03-25 10:48:54 +01:00

Lizzie commented

2026-03-12 22:49:56 +01:00

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Lets do the quick math
There was 1 LUT for every fsize() instancing

Now... the number of functions on each lut was (fsize + 1), multiplied by 5 (number of rounding modes)

8 = 9 * 5 = 45
16 = 17 * 5 = 85
32 = 33 * 5 = 165
64 = 65 * 5 = 325

this is just pure insanity - look at what fucking nm reported:

0000000003dc39b8 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<16ul, false>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut
0000000003dc3a18 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<16ul, true>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut
0000000003dc39d8 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<32ul, false>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut
0000000003dc3a38 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<32ul, true>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut
0000000003dc39f8 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<64ul, false>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut
0000000003dc3a58 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<64ul, true>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut

"ah its not bad" - OH MATE ITS JUST THE GUARD VARIABLES - i attached a file with just the functions generated for each case...

now with this PR only 6 * 6 functions are made (still not ideal, but way better), 36 is way better than 1156 FUCKING FUNCTIONS

Signed-off-by: lizzie lizzie@eden-emu.dev

Lets do the quick math There was 1 LUT for every fsize() instancing Now... the number of functions on each lut was (fsize + 1), multiplied by 5 (number of rounding modes) 8 = 9 * 5 = 45 16 = 17 * 5 = 85 32 = 33 * 5 = 165 64 = 65 * 5 = 325 this is just pure insanity - look at what fucking nm reported: ``` 0000000003dc39b8 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<16ul, false>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut 0000000003dc3a18 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<16ul, true>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut 0000000003dc39d8 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<32ul, false>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut 0000000003dc3a38 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<32ul, true>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut 0000000003dc39f8 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<64ul, false>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut 0000000003dc3a58 0000000000000008 V guard variable for void Dynarmic::Backend::X64::EmitFPVectorToFixed<64ul, true>(Dynarmic::Backend::X64::BlockOfCode&, Dynarmic::Backend::X64::EmitContext&, Dynarmic::IR::Inst*)::lut ``` "ah its not bad" - OH MATE ITS JUST THE GUARD VARIABLES - i attached a file with just the functions generated for each case... now with this PR only 6 * 6 functions are made (still not ideal, but way better), 36 is way better than 1156 FUCKING FUNCTIONS Signed-off-by: lizzie <lizzie@eden-emu.dev>

log.txt

769 KiB

Lizzie added 1 commit

2026-03-12 22:49:56 +01:00

[dynarmic] Remove last FPT LUT table, removing around 40kb worth of unused functions

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Signed-off-by: lizzie <lizzie@eden-emu.dev>

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2026-03-12 22:49:56 +01:00

Lizzie added 1 commit

2026-03-12 23:01:49 +01:00

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Lizzie changed title from ~~[dynarmic] Remove last FPT LUT table, removing around 40kb worth of unused functions~~ to [dynarmic] Remove last FPT LUT table, removing around 16kb worth of unused functions

2026-03-12 23:06:39 +01:00

Lizzie changed title from ~~[dynarmic] Remove last FPT LUT table, removing around 16kb worth of unused functions~~ to [dynarmic] Remove last FPT LUT table, removing around 25kb worth of unused functions

2026-03-12 23:08:24 +01:00

Lizzie changed title from ~~[dynarmic] Remove last FPT LUT table, removing around 25kb worth of unused functions~~ to [dynarmic] Remove last FPT LUT table, removing around 30kb worth of unused functions

2026-03-12 23:08:39 +01:00