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Moving definitions to use dedicated scratch register.

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ed
2026-08-18 09:26:49 -04:00
parent da007d342e
commit 86fe189b4e
5 changed files with 108 additions and 67 deletions
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code/hello_camera/hello_camera.c
+15 -16
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@@ -151,16 +151,17 @@ internal void compile_init_atoms(void) {
smem.normalize_v3s4 = build_normalize_v3s4(& ab,
RegUse_(build_normalize_v3s4) {
.scratch = ralloc(),
.src_ptr = ralloc(),
.dst_ptr = ralloc(),
.recip_est = ralloc(),
.norm = ralloc(),
.shift = ralloc(),
.src_x = ralloc(),
.t3 = ralloc(),
.t4 = ralloc(),
.t5 = ralloc(),
.scratch = ralloc(),
.src_ptr = ralloc(),
.dst_ptr = ralloc(),
.recip_est = ralloc(),
.norm = ralloc(),
.shift = ralloc(),
.src_x = ralloc(),
// .shift_count = ralloc(), /* dedicated slot for stage-3 → stage-4 shift count */
.t3 = ralloc(),
.t4 = ralloc(),
.t5 = ralloc(),
});
regfile_reset(& rf);
@@ -173,14 +174,14 @@ internal void compile_resolve_look_at(void) {
AtomArena ab = atomarena_make(slice_ut_arr(smem.resolve_look_at_mem));
AtomBundle_resolve_look_at_R bundle = C_(void*, smem.resolve_look_at_bundle);
U4 pin_mask = regfile_abi_mask | (1 << R_ResolveScratch);
RegFile rf = regfile(pin_mask);
/* R_ScratchBase (= R_SP) is a tape carrier preserved across atoms; no carrier
* pin is needed in the regfile. The standard 24-register pool is sufficient. */
RegFile rf = regfile(regfile_abi_mask);
#define ralloc() regfile_alloc(& rf)
#define ralloc_v3() { ralloc(), ralloc(), ralloc() }
bundle->input_and_sub = AtomBundleEntry_(resolve_look_at, input_and_sub)(& ab,
RegUse_(resolve_look_at_input_and_sub) {
.scratch = R_ResolveScratch,
.target = ralloc(),
.eye = ralloc(),
.up_in = ralloc(),
@@ -190,7 +191,7 @@ internal void compile_resolve_look_at(void) {
.t3 = ralloc(),
.t4 = ralloc(),
});
regfile_reset_to_mask(& rf, pin_mask);
regfile_reset(& rf);
bundle->normalize_fwd_uz = smem.normalize_v3s4;
bundle->cross_to_right = smem.gte_cross_v3s4;
@@ -200,7 +201,6 @@ internal void compile_resolve_look_at(void) {
bundle->pop_mv_trans = resolve_look_at__pop_mv_trans(& ab,
RegUse_(resolve_look_at__pop_mv_trans){
.scratch = R_ResolveScratch,
.look_at = ralloc(),
.eye = ralloc(),
.row = ralloc_v3(),
@@ -229,7 +229,6 @@ I_ void resolve_look_at(TapeBuilder_R tb
tb_data(tb, u4_(target));
tb_data(tb, u4_(eye));
tb_data(tb, u4_(up_in));
tb_data(tb, u4_(smem.scratchpad));
}
tb_emit(tb, bundle->normalize_fwd_uz); {
tb_data(tb, u4_(O_(ResolveLookAtScratch, fwd) | (O_(ResolveLookAtScratch, uz) << 16)));