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stage2: implement @memset and @memcpy builtins

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This commit is contained in:
Andrew Kelley
2021-09-24 17:33:06 -07:00
parent 87fd502fb6
commit 42aa1ea115
14 changed files with 412 additions and 36 deletions
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46
src/codegen/c.zig
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@@ -953,6 +953,8 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
.cmpxchg_strong => try airCmpxchg(f, inst, "strong"),
.atomic_rmw => try airAtomicRmw(f, inst),
.atomic_load => try airAtomicLoad(f, inst),
.memset => try airMemset(f, inst),
.memcpy => try airMemcpy(f, inst),
.int_to_float,
.float_to_int,
@@ -2005,8 +2007,12 @@ fn airAtomicRmw(f: *Function, inst: Air.Inst.Index) !CValue {
fn airAtomicLoad(f: *Function, inst: Air.Inst.Index) !CValue {
const atomic_load = f.air.instructions.items(.data)[inst].atomic_load;
const inst_ty = f.air.typeOfIndex(inst);
const ptr = try f.resolveInst(atomic_load.ptr);
const ptr_ty = f.air.typeOf(atomic_load.ptr);
if (!ptr_ty.isVolatilePtr() and f.liveness.isUnused(inst))
return CValue.none;
const inst_ty = f.air.typeOfIndex(inst);
const local = try f.allocLocal(inst_ty, .Const);
const writer = f.object.writer();
@@ -2036,6 +2042,44 @@ fn airAtomicStore(f: *Function, inst: Air.Inst.Index, order: [*:0]const u8) !CVa
return local;
}
fn airMemset(f: *Function, inst: Air.Inst.Index) !CValue {
const pl_op = f.air.instructions.items(.data)[inst].pl_op;
const extra = f.air.extraData(Air.Bin, pl_op.payload).data;
const dest_ptr = try f.resolveInst(pl_op.operand);
const value = try f.resolveInst(extra.lhs);
const len = try f.resolveInst(extra.rhs);
const writer = f.object.writer();
try writer.writeAll("memset(");
try f.writeCValue(writer, dest_ptr);
try writer.writeAll(", ");
try f.writeCValue(writer, value);
try writer.writeAll(", ");
try f.writeCValue(writer, len);
try writer.writeAll(");\n");
return CValue.none;
}
fn airMemcpy(f: *Function, inst: Air.Inst.Index) !CValue {
const pl_op = f.air.instructions.items(.data)[inst].pl_op;
const extra = f.air.extraData(Air.Bin, pl_op.payload).data;
const dest_ptr = try f.resolveInst(pl_op.operand);
const src_ptr = try f.resolveInst(extra.lhs);
const len = try f.resolveInst(extra.rhs);
const writer = f.object.writer();
try writer.writeAll("memcpy(");
try f.writeCValue(writer, dest_ptr);
try writer.writeAll(", ");
try f.writeCValue(writer, src_ptr);
try writer.writeAll(", ");
try f.writeCValue(writer, len);
try writer.writeAll(");\n");
return CValue.none;
}
fn toMemoryOrder(order: std.builtin.AtomicOrder) [:0]const u8 {
return switch (order) {
.Unordered => "memory_order_relaxed",