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more review, made a register file allocator (drafted, kinda iffy, want todo comp-time as well).

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ed
2026-08-13 23:39:03 -04:00
parent 5c9c61720f
commit 9a6eca6047
9 changed files with 122 additions and 153 deletions
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code/duffle/pad.atom.c
+15 -14
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@@ -11,16 +11,16 @@ ATOM_FILE_DEBUGGER_LINE_MARKER(pad_atom_c);
#pragma region MACs (Mips Atom Components)
FI_ Slice_MipsCode ac_pad_set_centered_axes(AtomBuilder_R ab, U4 r_state, U4 r_scratch) atom_dbg_skip MipsAtomComp_Proc_(ab, {
load_upper_i(r_scratch, (PadAxis_Centered_Word >> 16) & 0xFFFF),
or_i_self( r_scratch, PadAxis_Centered_Word & 0xFFFF),
store_word( r_scratch, r_state, O_(PadState,axes)),
FI_ Slice_MipsCode ac_pad_set_centered_axes(AtomBuilder_R ab, Reg state, Reg scratch) atom_dbg_skip MipsAtomComp_Proc_(ab, {
load_upper_i(scratch, (PadAxis_Centered >> 16) & 0xFFFF),
or_i_self( scratch, PadAxis_Centered & 0xFFFF),
// mac_load_word_imm(scratch, PadAxis_Centered),
store_word( scratch, state, O_(PadState,axes)),
})
FI_ Slice_MipsCode ac_pad_set_id_byte(AtomBuilder_R ab, U1 r_state, U1 r_id, U1 id_value)
atom_dbg_skip MipsAtomComp_Proc_(ab, {
FI_ Slice_MipsCode ac_pad_set_id_byte(AtomBuilder_R ab, Reg state, Reg r_id, U1 id_value) atom_dbg_skip MipsAtomComp_Proc_(ab, {
add_ui( r_id, R_0, id_value),
store_byte(r_id, r_state, O_(PadState,id)),
store_byte(r_id, state, O_(PadState,id)),
})
FI_ Slice_MipsCode ac_pad_set_status(AtomBuilder_R ab, U4 r_tmp, U1 r_state, U4 pad_status) atom_dbg_skip MipsAtomComp_Proc_(ab, {
@@ -55,12 +55,12 @@ FI_ Slice_MipsCode ac_pad_store_inverted_buttons(AtomBuilder_R ab, U1 r_buttons,
* byte_swap16(x) = (x >> 8) | (x << 8); nor(x, R_0) = ~x. store_half truncates to 16 bits so the upper-16 mask is implicit in the store.
*
* Register use (atom-local; no wave-context touched):
* R_T0 = raw base (kept throughout; axes loads read raw[4..7] from R_T0)
* R_T1 = state base (kept throughout; all stores go through R_T1)
* R_T2 = raw[0] status (alive across the disc/pending/id dispatch, then dead)
* R_T3 = raw[1] id (alive across the id dispatch, then dead)
* R_T4 = scratch (shifts, compares, immediate loads, store values)
* R_T5 = scratch (parallel lui+ori for the 0x80808080 axes constant + byte-swap target)
* R_T0 = raw base : Kept throughout; axes loads read raw[4..7] from R_T0.
* R_T1 = state base : Kept throughout; all stores go through R_T1.
* R_T2 = raw[0] status : Alive across the disc/pending/id dispatch, then dead.
* R_T3 = raw[1] id : Alive across the id dispatch, then dead.
* R_T4 = scratch : Shifts, compares, immediate loads, store values.
* R_T5 = scratch : Parallel lui + ori for the 0x80808080 axes constant + byte-swap target.
*/
enum {
R_PadRaw = R_T0 atom_reg atom_type(U1),
@@ -125,7 +125,8 @@ atom_label(id_dispatch) /* === Case 3-6: ID dispatch */
* R_T5 is then "dead" — only consumed at the analog_pad range check downstream. */
mac_pad_set_status(R_T4, R_PadState, PadStatus_Digital),
load_half_u( R_T4, R_PadRaw, O_(PadBiosRaw, buttons)), /* R_T4 = raw_buttons; */
load_upper_i(R_T5, PadAxis_Centered_Hi), or_i_self(R_T5, PadAxis_Centered_Lo), /* fills the buttons-load's delay slot (doesn't read R_T4) */
mac_load_word_imm(R_T5, PadAxis_Centered), /* fills the buttons-load's delay slot (doesn't read R_T4) */
// load_upper_i(R_T5, PadAxis_Centered_Hi), or_i_self(R_T5, PadAxis_Centered_Lo),
mac_pad_store_inverted_buttons(R_T4, R_PadState), /* R_T4 settled: nor + sh writes ~raw_buttons to state.buttons */
store_word(R_T5, R_PadState, O_(PadState, axes)), /* single sw writes the 4-byte axes block at offset 8 (left_x, left_y, right_x, right_y) */
mac_pad_set_id_byte(R_PadState, R_T4, PadRawId_Digital),