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CBE: Sorta working intcasts?

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This commit is contained in:
Noam Preil
2020-08-09 19:44:16 -04:00
committed by Andrew Kelley
parent 78fe86dcd2
commit dbd1e42ef2
2 changed files with 55 additions and 8 deletions
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27
src-self-hosted/codegen/c.zig
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@@ -117,6 +117,8 @@ fn genFn(file: *C, decl: *Decl) !void {
.dbg_stmt => try genDbgStmt(file, inst.castTag(.dbg_stmt).?, decl),
.breakpoint => try genBreak(file, inst.castTag(.breakpoint).?, decl),
.unreach => try genUnreach(file, inst.castTag(.unreach).?, decl),
// This will be handled correctly later?
.intcast => {},
else => |e| return file.fail(decl.src(), "TODO implement C codegen for {}", .{e}),
}
}
@@ -129,6 +131,20 @@ fn genRet(file: *C, inst: *Inst.UnOp, decl: *Decl, expected_return_type: Type) !
return file.fail(decl.src(), "TODO return {}", .{expected_return_type});
}
fn genIntCast(file: *C, inst: *Inst.UnOp, decl: *Decl, argdex: *usize) !void {
const op = inst.operand;
const writer = file.main.writer();
try writer.writeByte('(');
try renderType(file, writer, inst.base.ty, decl.src());
try writer.writeByte(')');
if (op.castTag(.arg)) |_| {
try writer.print("arg{}", .{argdex.*});
argdex.* += 1;
} else {
return file.fail(decl.src(), "TODO intcast {} to {}", .{ op, inst.base.ty });
}
}
fn genCall(file: *C, inst: *Inst.Call, decl: *Decl) !void {
const writer = file.main.writer();
const header = file.header.writer();
@@ -196,6 +212,8 @@ fn genAsm(file: *C, as: *Inst.Assembly, decl: *Decl, argdex: *usize) !void {
} else if (arg.castTag(.arg)) |inst| {
try writer.print("arg{}", .{argdex.*});
argdex.* += 1;
} else if (arg.castTag(.intcast)) |inst| {
try genIntCast(file, inst, decl, argdex);
} else {
return file.fail(decl.src(), "TODO non-constant inline asm args ({})", .{arg.tag});
}
@@ -220,14 +238,7 @@ fn genAsm(file: *C, as: *Inst.Assembly, decl: *Decl, argdex: *usize) !void {
if (index > 0) {
try writer.writeAll(", ");
}
try writer.writeAll("\"\"(");
if (arg.tag == .constant or arg.tag == .arg) {
try writer.print("{}_constant", .{reg});
} else {
// This is blocked by the earlier test
unreachable;
}
try writer.writeByte(')');
try writer.print("\"\"({}_constant)", .{reg});
} else {
// This is blocked by the earlier test
unreachable;