Skip to content

Some m6569.h (VIC-II) optimizations and improvements. #107

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 8 commits into from
Jan 6, 2025
Merged

Some m6569.h (VIC-II) optimizations and improvements. #107

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
8 commits
Select commit Hold shift + click to select a range
61b52b3
m6502, m6569: use UNREACHABLE in switch-default-branches
floooh Jan 3, 2025
d235b53
m6569.h: use bits for sprite unit dma_enabled, expand and disp_enbale…
floooh Jan 3, 2025
eb6d232
fix ui_m6569.h
floooh Jan 3, 2025
14e443a
m6569.h: fix sprite unit expand flag regression
floooh Jan 3, 2025
84bd874
m6569.h: merge sprite unit ba/aec calls, if-else coding style
floooh Jan 4, 2025
9b5b781
m6569.h: minor code cleanup
floooh Jan 4, 2025
e30eec5
m6569.h: raster line timing tweaks
floooh Jan 5, 2025
de1be66
m6569.h: move _m6569_rs_update_display_state into cycle 58
floooh Jan 5, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 9 additions & 0 deletions chips/m6502.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -402,6 +402,14 @@ uint16_t m6502_pc(m6502_t* cpu);
#define CHIPS_ASSERT(c) assert(c)
#endif

#if defined(__GNUC__)
#define _M6502_UNREACHABLE __builtin_unreachable()
#elif defined(_MSC_VER)
#define _M6502_UNREACHABLE __assume(0)
#else
#define _M6502_UNREACHABLE
#endif

/* register access functions */
void m6502_set_a(m6502_t* cpu, uint8_t v) { cpu->A = v; }
void m6502_set_x(m6502_t* cpu, uint8_t v) { cpu->X = v; }
Expand Down Expand Up @@ -3074,6 +3082,7 @@ uint64_t m6502_tick(m6502_t* c, uint64_t pins) {
case (0xFF<<3)|6: _FETCH();break;
case (0xFF<<3)|7: assert(false);break;
// %>
default: _M6502_UNREACHABLE;
}
M6510_SET_PORT(pins, c->io_pins);
c->PINS = pins;
Expand Down
Loading
Loading