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CBE: "compute" max int alignment the lazy way

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This commit is contained in:
Jacob Young 2023-03-03 01:48:13 -05:00
parent 93d696e84e
commit e96a0fd0a1
2 changed files with 15 additions and 9 deletions
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2
lib/zig.h
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@ -1921,7 +1921,7 @@ static inline zig_i128 zig_bit_reverse_i128(zig_i128 val, uint8_t bits) {
static inline uint16_t zig_int_bytes(uint16_t bits) {
uint16_t bytes = (bits + CHAR_BIT - 1) / CHAR_BIT;
uint16_t alignment = 16;
uint16_t alignment = ZIG_TARGET_MAX_INT_ALIGNMENT;
while (alignment / 2 >= bytes) alignment /= 2;
return (bytes + alignment - 1) / alignment * alignment;
}

22
src/link/C.zig
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@ -221,14 +221,19 @@ pub fn flush(self: *C, comp: *Compilation, prog_node: *std.Progress.Node) !void
return self.flushModule(comp, prog_node);
}
fn abiDefine(comp: *Compilation) ?[]const u8 {
return switch (comp.getTarget().abi) {
.msvc => "#define ZIG_TARGET_ABI_MSVC\n",
else => null,
};
fn abiDefines(self: *C, target: std.Target) !std.ArrayList(u8) {
var defines = std.ArrayList(u8).init(self.base.allocator);
errdefer defines.deinit();
const writer = defines.writer();
switch (target.abi) {
.msvc => try writer.writeAll("#define ZIG_TARGET_ABI_MSVC\n"),
else => {},
}
try writer.print("#define ZIG_TARGET_MAX_INT_ALIGNMENT {d}\n", .{target.maxIntAlignment()});
return defines;
}
pub fn flushModule(self: *C, comp: *Compilation, prog_node: *std.Progress.Node) !void {
pub fn flushModule(self: *C, _: *Compilation, prog_node: *std.Progress.Node) !void {
const tracy = trace(@src());
defer tracy.end();
@ -245,12 +250,13 @@ pub fn flushModule(self: *C, comp: *Compilation, prog_node: *std.Progress.Node)
var f: Flush = .{};
defer f.deinit(gpa);
const abi_define = abiDefine(comp);
const abi_defines = try self.abiDefines(module.getTarget());
defer abi_defines.deinit();
// Covers defines, zig.h, ctypes, asm, lazy fwd.
try f.all_buffers.ensureUnusedCapacity(gpa, 5);
if (abi_define) |buf| f.appendBufAssumeCapacity(buf);
f.appendBufAssumeCapacity(abi_defines.items);
f.appendBufAssumeCapacity(zig_h);
const ctypes_index = f.all_buffers.items.len;