Commit 3a03872af7
Changed files (1)
src
codegen
src/codegen/llvm.zig
@@ -858,71 +858,34 @@ pub const Object = struct {
try args.append(aggregate);
},
.multiple_llvm_ints => {
- const param_ty = fn_info.param_types[it.zig_index - 1];
const llvm_ints = it.llvm_types_buffer[0..it.llvm_types_len];
- switch (param_ty.zigTypeTag()) {
- .Struct => {
- const fields = param_ty.structFields().values();
- const param_llvm_ty = try dg.lowerType(param_ty);
- const param_alignment = param_ty.abiAlignment(target);
- const arg_ptr = buildAllocaInner(builder, llvm_func, false, param_llvm_ty);
- arg_ptr.setAlignment(param_alignment);
-
- var field_i: u32 = 0;
- var field_offset: u32 = 0;
- for (llvm_ints) |int_bits| {
- const param = llvm_func.getParam(llvm_arg_i);
- llvm_arg_i += 1;
-
- const big_int_ty = dg.context.intType(int_bits);
- var bits_used: u32 = 0;
- while (bits_used < int_bits) {
- const field = fields[field_i];
- const field_alignment = field.normalAlignment(target);
- const prev_offset = field_offset;
- field_offset = std.mem.alignForwardGeneric(u32, field_offset, field_alignment);
- if (field_offset > prev_offset) {
- // Padding counts as bits used.
- bits_used += (field_offset - prev_offset) * 8;
- if (bits_used >= int_bits) break;
- }
- const field_size = @intCast(u16, field.ty.abiSize(target));
- const field_abi_bits = field_size * 8;
- const field_int_ty = dg.context.intType(field_abi_bits);
- const shifted = if (bits_used == 0) param else s: {
- const shift_amt = big_int_ty.constInt(bits_used, .False);
- break :s builder.buildLShr(param, shift_amt, "");
- };
- const field_as_int = builder.buildTrunc(shifted, field_int_ty, "");
- var ty_buf: Type.Payload.Pointer = undefined;
- const llvm_i = llvmFieldIndex(param_ty, field_i, target, &ty_buf).?;
- const field_ptr = builder.buildStructGEP(arg_ptr, llvm_i, "");
- const casted_ptr = builder.buildBitCast(field_ptr, field_int_ty.pointerType(0), "");
- const store_inst = builder.buildStore(field_as_int, casted_ptr);
- store_inst.setAlignment(field_alignment);
-
- field_i += 1;
- if (field_i >= fields.len) break;
-
- bits_used += field_abi_bits;
- field_offset += field_size;
- }
- if (field_i >= fields.len) break;
- }
-
- const is_by_ref = isByRef(param_ty);
- const loaded = if (is_by_ref) arg_ptr else l: {
- const load_inst = builder.buildLoad(arg_ptr, "");
- load_inst.setAlignment(param_alignment);
- break :l load_inst;
- };
- try args.append(loaded);
- },
- .Union => {
- @panic("TODO: LLVM backend: implement C calling convention on x86_64 with union parameter");
- },
- else => unreachable,
+ const param_ty = fn_info.param_types[it.zig_index - 1];
+ const param_llvm_ty = try dg.lowerType(param_ty);
+ const param_alignment = param_ty.abiAlignment(target);
+ const arg_ptr = buildAllocaInner(builder, llvm_func, false, param_llvm_ty);
+ arg_ptr.setAlignment(param_alignment);
+ var field_types_buf: [8]*const llvm.Type = undefined;
+ const field_types = field_types_buf[0..llvm_ints.len];
+ for (llvm_ints) |int_bits, i| {
+ field_types[i] = dg.context.intType(int_bits);
+ }
+ const ints_llvm_ty = dg.context.structType(field_types.ptr, @intCast(c_uint, field_types.len), .False);
+ const casted_ptr = builder.buildBitCast(arg_ptr, ints_llvm_ty.pointerType(0), "");
+ for (llvm_ints) |_, i_usize| {
+ const i = @intCast(c_uint, i_usize);
+ const param = llvm_func.getParam(i);
+ const field_ptr = builder.buildStructGEP(casted_ptr, i, "");
+ const store_inst = builder.buildStore(param, field_ptr);
+ store_inst.setAlignment(target.cpu.arch.ptrBitWidth() / 8);
}
+
+ const is_by_ref = isByRef(param_ty);
+ const loaded = if (is_by_ref) arg_ptr else l: {
+ const load_inst = builder.buildLoad(arg_ptr, "");
+ load_inst.setAlignment(param_alignment);
+ break :l load_inst;
+ };
+ try args.append(loaded);
},
};
}
@@ -2821,65 +2784,11 @@ pub const DeclGen = struct {
llvm_params.appendAssumeCapacity(len_llvm_ty);
},
.multiple_llvm_ints => {
- const param_ty = fn_info.param_types[it.zig_index - 1];
const llvm_ints = it.llvm_types_buffer[0..it.llvm_types_len];
try llvm_params.ensureUnusedCapacity(it.llvm_types_len);
-
- // The reason we have all this logic instead of simply appending
- // big_int_ty is for the special case of a pointer type;
- // we want to use a pointer type instead of inttoptr at the callsites,
- // which may prevent optimization.
- switch (param_ty.zigTypeTag()) {
- .Struct => {
- const fields = param_ty.structFields().values();
- var field_i: u32 = 0;
- var field_offset: u32 = 0;
- llvm_arg: for (llvm_ints) |int_bits| {
- const big_int_ty = dg.context.intType(int_bits);
- var bits_used: u32 = 0;
- while (bits_used < int_bits) {
- const field = fields[field_i];
- const field_alignment = field.normalAlignment(target);
- const prev_offset = field_offset;
- field_offset = std.mem.alignForwardGeneric(u32, field_offset, field_alignment);
- if (field_offset > prev_offset) {
- // Padding counts as bits used.
- bits_used += (field_offset - prev_offset) * 8;
- if (bits_used >= int_bits) break;
- }
- const field_size = @intCast(u16, field.ty.abiSize(target));
- const field_abi_bits = field_size * 8;
-
- // Special case for when the entire LLVM integer represents
- // one field; in this case keep the type information
- // to avoid the potentially costly ptrtoint/bitcast.
- if (bits_used == 0 and field_abi_bits == int_bits) {
- const llvm_field_ty = try dg.lowerType(field.ty);
- llvm_params.appendAssumeCapacity(llvm_field_ty);
- field_i += 1;
- if (field_i >= fields.len) {
- break :llvm_arg;
- } else {
- continue :llvm_arg;
- }
- }
-
- field_i += 1;
- if (field_i >= fields.len) break;
-
- bits_used += field_abi_bits;
- field_offset += field_size;
- }
- llvm_params.appendAssumeCapacity(big_int_ty);
- if (field_i >= fields.len) break;
- }
- },
- else => {
- for (llvm_ints) |int_bits| {
- const big_int_ty = dg.context.intType(int_bits);
- llvm_params.appendAssumeCapacity(big_int_ty);
- }
- },
+ for (llvm_ints) |int_bits| {
+ const big_int_ty = dg.context.intType(int_bits);
+ llvm_params.appendAssumeCapacity(big_int_ty);
}
},
};
@@ -4299,80 +4208,27 @@ pub const FuncGen = struct {
const llvm_ints = it.llvm_types_buffer[0..it.llvm_types_len];
const llvm_arg = try self.resolveInst(arg);
const is_by_ref = isByRef(param_ty);
- try llvm_args.ensureUnusedCapacity(it.llvm_types_len);
- switch (param_ty.zigTypeTag()) {
- .Struct => {
- const fields = param_ty.structFields().values();
- var field_i: u32 = 0;
- var field_offset: u32 = 0;
- for (llvm_ints) |int_bits| {
- const big_int_ty = self.dg.context.intType(int_bits);
- var int_arg: *const llvm.Value = undefined;
- var bits_used: u32 = 0;
- while (bits_used < int_bits) {
- const field = fields[field_i];
- const field_alignment = field.normalAlignment(target);
- const prev_offset = field_offset;
- field_offset = std.mem.alignForwardGeneric(u32, field_offset, field_alignment);
- if (field_offset > prev_offset) {
- // Padding counts as bits used.
- bits_used += (field_offset - prev_offset) * 8;
- if (bits_used >= int_bits) break;
- }
- var ty_buf: Type.Payload.Pointer = undefined;
- const llvm_i = llvmFieldIndex(param_ty, field_i, target, &ty_buf).?;
- const field_size = @intCast(u16, field.ty.abiSize(target));
- const field_abi_bits = field_size * 8;
-
- // Special case for when the entire LLVM integer represents
- // one field; in this case keep the type information
- // to avoid the potentially costly ptrtoint/bitcast.
- if (bits_used == 0 and field_abi_bits == int_bits) {
- int_arg = if (is_by_ref) f: {
- const field_ptr = self.builder.buildStructGEP(llvm_arg, llvm_i, "");
- const load_inst = self.builder.buildLoad(field_ptr, "");
- load_inst.setAlignment(field_alignment);
- break :f load_inst;
- } else self.builder.buildExtractValue(llvm_arg, llvm_i, "");
- field_i += 1;
- break;
- }
-
- const field_int_ty = self.dg.context.intType(field_abi_bits);
- const llvm_field = if (is_by_ref) f: {
- const field_ptr = self.builder.buildStructGEP(llvm_arg, llvm_i, "");
- const casted_ptr = self.builder.buildBitCast(field_ptr, field_int_ty.pointerType(0), "");
- const load_inst = self.builder.buildLoad(casted_ptr, "");
- load_inst.setAlignment(field_alignment);
- break :f load_inst;
- } else f: {
- const llvm_field = self.builder.buildExtractValue(llvm_arg, llvm_i, "");
- break :f self.builder.buildBitCast(llvm_field, field_int_ty, "");
- };
-
- const extended = self.builder.buildZExt(llvm_field, big_int_ty, "");
- if (bits_used == 0) {
- int_arg = extended;
- } else {
- const shift_amt = big_int_ty.constInt(bits_used, .False);
- const shifted = self.builder.buildShl(extended, shift_amt, "");
- int_arg = self.builder.buildOr(int_arg, shifted, "");
- }
-
- field_i += 1;
- if (field_i >= fields.len) break;
+ const arg_ptr = if (is_by_ref) llvm_arg else p: {
+ const p = self.buildAlloca(llvm_arg.typeOf());
+ const store_inst = self.builder.buildStore(llvm_arg, p);
+ store_inst.setAlignment(param_ty.abiAlignment(target));
+ break :p p;
+ };
- bits_used += field_abi_bits;
- field_offset += field_size;
- }
- llvm_args.appendAssumeCapacity(int_arg);
- if (field_i >= fields.len) break;
- }
- },
- .Union => {
- return self.todo("airCall C calling convention on x86_64 with union argument ", .{});
- },
- else => unreachable,
+ var field_types_buf: [8]*const llvm.Type = undefined;
+ const field_types = field_types_buf[0..llvm_ints.len];
+ for (llvm_ints) |int_bits, i| {
+ field_types[i] = self.dg.context.intType(int_bits);
+ }
+ const ints_llvm_ty = self.dg.context.structType(field_types.ptr, @intCast(c_uint, field_types.len), .False);
+ const casted_ptr = self.builder.buildBitCast(arg_ptr, ints_llvm_ty.pointerType(0), "");
+ try llvm_args.ensureUnusedCapacity(it.llvm_types_len);
+ for (llvm_ints) |_, i_usize| {
+ const i = @intCast(c_uint, i_usize);
+ const field_ptr = self.builder.buildStructGEP(casted_ptr, i, "");
+ const load_inst = self.builder.buildLoad(field_ptr, "");
+ load_inst.setAlignment(target.cpu.arch.ptrBitWidth() / 8);
+ llvm_args.appendAssumeCapacity(load_inst);
}
},
};