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some more loader size optimizations

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This commit is contained in:
Dennis Ranke
2021-12-28 21:43:58 +01:00
parent 4521fb73ef
commit 0f22b1efb9
2 changed files with 14 additions and 19 deletions
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33
platform/src/loader.cwa
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@@ -43,17 +43,16 @@ export fn load_uw8(module_size: i32) -> i32 {
}
fn section_size(ptr: i32) -> i32 {
let p = ptr + 1;
let l = 0;
let shift = 0;
let p = ptr;
let l: i32;
let shift: i32;
loop size {
let lazy b = p?0;
let lazy b = (p := p + 1)?0;
l = l | ((b & 127) << shift);
shift = shift + 7;
p = p + 1;
branch_if b & 128: size;
branch_if b >> 7: size;
}
p - ptr + l
p + 1 - ptr + l
}
fn copy_section(dest: i32, src: i32) -> i32 {
@@ -63,10 +62,10 @@ fn copy_section(dest: i32, src: i32) -> i32 {
}
fn copy(dest: i32, src: i32, len: i32) {
if len > 0 {
loop bytes {
loop bytes {
if len > 0 {
(dest + (len := len - 1))?0 = (src + len)?0;
branch_if len: bytes
branch bytes;
}
}
}
@@ -84,12 +83,10 @@ export fn uncompress(src_ptr: i32, dest_ptr: i32) -> i32 {
let offset: i32;
let byte: i32;
let i: i32;
loop init_contexts {
i?0x3c000 = 0x80;
branch_if (i := i + 1) < 256 + 1 + 128: init_contexts
branch_if (i := i + 1) < 256 + 1 + 128: init_contexts;
}
let prev_was_match: i32;
@@ -100,8 +97,7 @@ export fn uncompress(src_ptr: i32, dest_ptr: i32) -> i32 {
if is_match {
let inline new_offset = if prev_was_match { 1 } else { upkr_bit(256) };
if new_offset {
offset = upkr_length(257) - 1;
branch_if !offset: finished
branch_if !(offset := upkr_length(257) - 1): finished;
}
let length = upkr_length(257 + 64);
loop copy {
@@ -111,7 +107,7 @@ export fn uncompress(src_ptr: i32, dest_ptr: i32) -> i32 {
}
} else {
// literal
byte = 1;
let byte = 1;
loop literal {
branch_if (byte := (byte << 1) | upkr_bit(byte)) < 256: literal;
}
@@ -130,9 +126,8 @@ fn upkr_length(context_index: i32) -> i32 {
let length: i32;
let bit_pos: i32;
loop bits {
if upkr_bit(context_index) {
length = length | (upkr_bit(context_index + 1) << bit_pos);
context_index = context_index + 2;
if upkr_bit(context_index + bit_pos) {
length = length | (upkr_bit(context_index + bit_pos + 32) << bit_pos);
bit_pos = bit_pos + 1;
branch bits;
}