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wasm: implement cmpxchg{weak/strong}

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Luuk de Gram 2023-04-18 21:06:03 +02:00
parent 7285eedcd2
commit 5bbd482286
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1 changed files with 39 additions and 2 deletions
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41
src/arch/wasm/CodeGen.zig
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@ -1956,8 +1956,6 @@ fn genInst(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
.is_err_ptr,
.is_non_err_ptr,
.cmpxchg_weak,
.cmpxchg_strong,
.fence,
.atomic_load,
.atomic_store_unordered,
@ -1977,6 +1975,9 @@ fn genInst(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
.c_va_start,
=> |tag| return func.fail("TODO: Implement wasm inst: {s}", .{@tagName(tag)}),
.cmpxchg_weak => func.airCmpxchg(inst),
.cmpxchg_strong => func.airCmpxchg(inst),
.add_optimized,
.addwrap_optimized,
.sub_optimized,
@ -6597,3 +6598,39 @@ fn airErrorSetHasValue(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
return func.finishAir(inst, result, &.{ty_op.operand});
}
fn airCmpxchg(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
const ty_pl = func.air.instructions.items(.data)[inst].ty_pl;
const extra = func.air.extraData(Air.Cmpxchg, ty_pl.payload).data;
const ptr_ty = func.air.typeOf(extra.ptr);
const ty = ptr_ty.childType();
const result_ty = func.air.typeOfIndex(inst);
const ptr_operand = try func.resolveInst(extra.ptr);
const expected_val = try func.resolveInst(extra.expected_value);
const new_val = try func.resolveInst(extra.new_value);
const ptr_val = try WValue.toLocal(try func.load(ptr_operand, ty, 0), func, ty);
try func.lowerToStack(ptr_operand);
try func.emitWValue(new_val);
try func.emitWValue(ptr_val);
const cmp_tmp = try func.cmp(ptr_val, expected_val, ty, .eq);
const cmp_result = try cmp_tmp.toLocal(func, Type.bool);
try func.emitWValue(cmp_result);
try func.addTag(.select);
try func.store(.stack, .stack, ty, 0);
try func.addImm32(-1);
try func.emitWValue(cmp_result);
try func.addTag(.i32_xor);
try func.addImm32(1);
try func.addTag(.i32_and);
const and_result = try WValue.toLocal(.stack, func, Type.bool);
const result_ptr = try func.allocStack(result_ty);
try func.store(result_ptr, and_result, Type.bool, @intCast(u32, ty.abiSize(func.target)));
try func.store(result_ptr, ptr_val, ty, 0);
return func.finishAir(inst, result_ptr, &.{ extra.ptr, extra.new_value, extra.expected_value });
}