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LLVM: Implement more efficient blob writing

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antlilja
2024-02-27 13:19:09 +01:00
parent 6e078883ee
commit 826c6c0ec6
2 changed files with 13 additions and 16 deletions
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17
src/codegen/llvm/bitcode_writer.zig
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@@ -139,6 +139,17 @@ pub fn BitcodeWriter(comptime types: []const type) type {
try self.writeBits(charTo6Bit(c), 6);
}
pub fn writeBlob(self: *BcWriter, blob: []const u8) Error!void {
const blob_word_size = std.mem.alignForward(usize, blob.len, 4);
try self.buffer.ensureUnusedCapacity(blob_word_size + 1);
self.alignTo32() catch unreachable;
const slice = self.buffer.addManyAsSliceAssumeCapacity(blob_word_size / 4);
const slice_bytes = std.mem.sliceAsBytes(slice);
@memcpy(slice_bytes[0..blob.len], blob);
@memset(slice_bytes[blob.len..], 0);
}
pub fn alignTo32(self: *BcWriter) Error!void {
if (self.bit_count == 0) return;
@@ -256,11 +267,7 @@ pub fn BitcodeWriter(comptime types: []const type) type {
.char6 => try self.bitcode.write6BitChar(adapter.get(param, field_name)),
.blob => {
try self.bitcode.writeVBR(param.len, 6);
try self.bitcode.alignTo32();
for (param) |x| {
try self.bitcode.writeBits(x, 8);
}
try self.bitcode.alignTo32();
try self.bitcode.writeBlob(param);
},
.array_fixed => |len| {
try self.bitcode.writeVBR(param.len, 6);