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This has better code generation

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This commit is contained in:
Gwilym Inzani 2023-09-06 00:37:23 +01:00
parent 77445b304f
commit bb57298c54
1 changed files with 26 additions and 19 deletions
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45
agb/src/display/tiled/vram_manager.rs
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@ -385,25 +385,32 @@ impl VRamManager {
let target_location = tile_reference.0.as_ptr() as *mut _;
unsafe {
core::arch::asm!(
"cmp r2, #0",
"beq 1f",
"ldmia r0!, {{r2-r5}}",
"stmia r1!, {{r2-r5}}",
"ldmia r0!, {{r2-r5}}",
"stmia r1!, {{r2-r5}}",
"1:",
"ldmia r0!, {{r2-r5}}",
"stmia r1!, {{r2-r5}}",
"ldmia r0!, {{r2-r5}}",
"stmia r1!, {{r2-r5}}",
inout("r0") tile_data_start => _,
inout("r1") target_location => _,
inout("r2") tile_format as u32 => _,
out("r3") _,
out("r4") _,
out("r5") _,
);
match tile_format {
TileFormat::FourBpp => core::arch::asm!(
".rept 2",
"ldmia r0!, {{r2-r5}}",
"stmia r1!, {{r2-r5}}",
".endr",
inout("r0") tile_data_start => _,
inout("r1") target_location => _,
out("r2") _,
out("r3") _,
out("r4") _,
out("r5") _,
),
TileFormat::EightBpp => core::arch::asm!(
".rept 4",
"ldmia r0!, {{r2-r5}}",
"stmia r1!, {{r2-r5}}",
".endr",
inout("r0") tile_data_start => _,
inout("r1") target_location => _,
out("r2") _,
out("r3") _,
out("r4") _,
out("r5") _,
),
}
}
}