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correctly implementing big block copies

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This commit is contained in:
Jakub Doka 2024-10-13 15:49:14 +02:00
parent 19a6cdd764
commit 54d93608aa
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GPG key ID: C6E9A89936B8C143
1 changed files with 16 additions and 3 deletions
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19
lang/src/codegen.rs
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@ -12,7 +12,7 @@ use {
TypedReloc, Types, HEADER_SIZE,
},
alloc::{boxed::Box, string::String, vec::Vec},
core::fmt::Display,
core::{fmt::Display, u16},
};
type Offset = u32;
@ -2329,7 +2329,7 @@ impl Codegen {
self.store_sized_low(src.into(), dst.into(), size);
}
fn store_sized_low(&mut self, src: LocCow, dst: LocCow, size: Size) {
fn store_sized_low(&mut self, src: LocCow, dst: LocCow, mut size: Size) {
macro_rules! lpat {
($der:literal, $reg:ident, $off:pat, $sta:pat) => {
&Loc::Rt { derefed: $der, reg: ref $reg, offset: $off, stack: $sta }
@ -2372,7 +2372,20 @@ impl Codegen {
let dst_off = if dst.is_ref() { self.ci.regs.allocate() } else { dst.as_ref() };
self.stack_offset(src_off.get(), src.get(), ssta.as_ref(), soff);
self.stack_offset(dst_off.get(), dst.get(), dsta.as_ref(), doff);
self.ci.emit(bmc(src_off.get(), dst_off.get(), size as _));
loop {
match u16::try_from(size) {
Ok(o) => {
self.ci.emit(bmc(src_off.get(), dst_off.get(), o));
break;
}
Err(_) => {
self.ci.emit(bmc(src_off.get(), dst_off.get(), u16::MAX));
self.ci.emit(addi64(src_off.get(), src_off.get(), u16::MAX as _));
self.ci.emit(addi64(dst_off.get(), dst_off.get(), u16::MAX as _));
size -= u16::MAX as u32;
}
}
}
self.ci.regs.free(src_off);
self.ci.regs.free(dst_off);
}