| ... | ... | @@ -4,7 +4,6 @@ const mem = std.mem; |
| 4 | 4 | const assert = std.debug.assert; |
| 5 | 5 | const Allocator = std.mem.Allocator; |
| 6 | 6 | const Air = @import("Air.zig"); |
| 7 | | const StaticBitSet = std.bit_set.StaticBitSet; |
| 8 | 7 | const Type = @import("type.zig").Type; |
| 9 | 8 | const Module = @import("Module.zig"); |
| 10 | 9 | const expect = std.testing.expect; |
| ... | ... | @@ -42,39 +41,49 @@ pub fn RegisterManager( |
| 42 | 41 | registers: [tracked_registers.len]Air.Inst.Index = undefined, |
| 43 | 42 | /// Tracks which registers are free (in which case the |
| 44 | 43 | /// corresponding bit is set to 1) |
| 45 | | free_registers: RegisterBitSet = RegisterBitSet.initFull(), |
| 44 | free_registers: RegisterBitSet = math.maxInt(RegisterBitSet), |
| 46 | 45 | /// Tracks all registers allocated in the course of this |
| 47 | 46 | /// function |
| 48 | | allocated_registers: RegisterBitSet = RegisterBitSet.initEmpty(), |
| 47 | allocated_registers: RegisterBitSet = 0, |
| 49 | 48 | /// Tracks registers which are locked from being allocated |
| 50 | | locked_registers: RegisterBitSet = RegisterBitSet.initEmpty(), |
| 49 | locked_registers: RegisterBitSet = 0, |
| 51 | 50 | |
| 52 | 51 | const Self = @This(); |
| 53 | 52 | |
| 54 | | pub const RegisterBitSet = StaticBitSet(tracked_registers.len); |
| 53 | /// An integer whose bits represent all the registers and |
| 54 | /// whether they are free. |
| 55 | pub const RegisterBitSet = std.meta.Int(.unsigned, tracked_registers.len); |
| 56 | const ShiftInt = math.Log2Int(RegisterBitSet); |
| 55 | 57 | |
| 56 | 58 | fn getFunction(self: *Self) *Function { |
| 57 | 59 | return @fieldParentPtr(Function, "register_manager", self); |
| 58 | 60 | } |
| 59 | 61 | |
| 60 | 62 | fn excludeRegister(reg: Register, register_class: RegisterBitSet) bool { |
| 61 | | const index = indexOfRegIntoTracked(reg) orelse return true; |
| 62 | | return !register_class.isSet(index); |
| 63 | const mask = getRegisterMask(reg) orelse return true; |
| 64 | return mask & register_class == 0; |
| 65 | } |
| 66 | |
| 67 | fn getRegisterMask(reg: Register) ?RegisterBitSet { |
| 68 | const index = indexOfRegIntoTracked(reg) orelse return null; |
| 69 | const shift = @intCast(ShiftInt, index); |
| 70 | const mask = @as(RegisterBitSet, 1) << shift; |
| 71 | return mask; |
| 63 | 72 | } |
| 64 | 73 | |
| 65 | 74 | fn markRegAllocated(self: *Self, reg: Register) void { |
| 66 | | const index = indexOfRegIntoTracked(reg) orelse return; |
| 67 | | self.allocated_registers.set(index); |
| 75 | const mask = getRegisterMask(reg) orelse return; |
| 76 | self.allocated_registers |= mask; |
| 68 | 77 | } |
| 69 | 78 | |
| 70 | 79 | fn markRegUsed(self: *Self, reg: Register) void { |
| 71 | | const index = indexOfRegIntoTracked(reg) orelse return; |
| 72 | | self.free_registers.unset(index); |
| 80 | const mask = getRegisterMask(reg) orelse return; |
| 81 | self.free_registers &= ~mask; |
| 73 | 82 | } |
| 74 | 83 | |
| 75 | 84 | fn markRegFree(self: *Self, reg: Register) void { |
| 76 | | const index = indexOfRegIntoTracked(reg) orelse return; |
| 77 | | self.free_registers.set(index); |
| 85 | const mask = getRegisterMask(reg) orelse return; |
| 86 | self.free_registers |= mask; |
| 78 | 87 | } |
| 79 | 88 | |
| 80 | 89 | pub fn indexOfReg( |
| ... | ... | @@ -87,14 +96,14 @@ pub fn RegisterManager( |
| 87 | 96 | return null; |
| 88 | 97 | } |
| 89 | 98 | |
| 90 | | pub fn indexOfRegIntoTracked(reg: Register) ?RegisterBitSet.ShiftInt { |
| 99 | pub fn indexOfRegIntoTracked(reg: Register) ?ShiftInt { |
| 91 | 100 | return indexOfReg(tracked_registers, reg); |
| 92 | 101 | } |
| 93 | 102 | |
| 94 | 103 | /// Returns true when this register is not tracked |
| 95 | 104 | pub fn isRegFree(self: Self, reg: Register) bool { |
| 96 | | const index = indexOfRegIntoTracked(reg) orelse return true; |
| 97 | | return self.free_registers.isSet(index); |
| 105 | const mask = getRegisterMask(reg) orelse return true; |
| 106 | return self.free_registers & mask != 0; |
| 98 | 107 | } |
| 99 | 108 | |
| 100 | 109 | /// Returns whether this register was allocated in the course |
| ... | ... | @@ -102,16 +111,16 @@ pub fn RegisterManager( |
| 102 | 111 | /// |
| 103 | 112 | /// Returns false when this register is not tracked |
| 104 | 113 | pub fn isRegAllocated(self: Self, reg: Register) bool { |
| 105 | | const index = indexOfRegIntoTracked(reg) orelse return false; |
| 106 | | return self.allocated_registers.isSet(index); |
| 114 | const mask = getRegisterMask(reg) orelse return false; |
| 115 | return self.allocated_registers & mask != 0; |
| 107 | 116 | } |
| 108 | 117 | |
| 109 | 118 | /// Returns whether this register is locked |
| 110 | 119 | /// |
| 111 | 120 | /// Returns false when this register is not tracked |
| 112 | 121 | pub fn isRegLocked(self: Self, reg: Register) bool { |
| 113 | | const index = indexOfRegIntoTracked(reg) orelse return false; |
| 114 | | return self.locked_registers.isSet(index); |
| 122 | const mask = getRegisterMask(reg) orelse return false; |
| 123 | return self.locked_registers & mask != 0; |
| 115 | 124 | } |
| 116 | 125 | |
| 117 | 126 | pub const RegisterLock = struct { |
| ... | ... | @@ -130,8 +139,8 @@ pub fn RegisterManager( |
| 130 | 139 | log.debug(" register already locked", .{}); |
| 131 | 140 | return null; |
| 132 | 141 | } |
| 133 | | const index = indexOfRegIntoTracked(reg) orelse return null; |
| 134 | | self.locked_registers.set(index); |
| 142 | const mask = getRegisterMask(reg) orelse return null; |
| 143 | self.locked_registers |= mask; |
| 135 | 144 | return RegisterLock{ .register = reg }; |
| 136 | 145 | } |
| 137 | 146 | |
| ... | ... | @@ -140,8 +149,8 @@ pub fn RegisterManager( |
| 140 | 149 | pub fn lockRegAssumeUnused(self: *Self, reg: Register) RegisterLock { |
| 141 | 150 | log.debug("locking asserting free {}", .{reg}); |
| 142 | 151 | assert(!self.isRegLocked(reg)); |
| 143 | | const index = indexOfRegIntoTracked(reg) orelse unreachable; |
| 144 | | self.locked_registers.set(index); |
| 152 | const mask = getRegisterMask(reg) orelse unreachable; |
| 153 | self.locked_registers |= mask; |
| 145 | 154 | return RegisterLock{ .register = reg }; |
| 146 | 155 | } |
| 147 | 156 | |
| ... | ... | @@ -163,13 +172,13 @@ pub fn RegisterManager( |
| 163 | 172 | /// Call `lockReg` to obtain the lock first. |
| 164 | 173 | pub fn unlockReg(self: *Self, lock: RegisterLock) void { |
| 165 | 174 | log.debug("unlocking {}", .{lock.register}); |
| 166 | | const index = indexOfRegIntoTracked(lock.register) orelse return; |
| 167 | | self.locked_registers.unset(index); |
| 175 | const mask = getRegisterMask(lock.register) orelse return; |
| 176 | self.locked_registers &= ~mask; |
| 168 | 177 | } |
| 169 | 178 | |
| 170 | 179 | /// Returns true when at least one register is locked |
| 171 | 180 | pub fn lockedRegsExist(self: Self) bool { |
| 172 | | return self.locked_registers.count() > 0; |
| 181 | return self.locked_registers != 0; |
| 173 | 182 | } |
| 174 | 183 | |
| 175 | 184 | /// Allocates a specified number of registers, optionally |
| ... | ... | @@ -183,15 +192,10 @@ pub fn RegisterManager( |
| 183 | 192 | ) ?[count]Register { |
| 184 | 193 | comptime assert(count > 0 and count <= tracked_registers.len); |
| 185 | 194 | |
| 186 | | var free_and_not_locked_registers = self.free_registers; |
| 187 | | free_and_not_locked_registers.setIntersection(register_class); |
| 188 | | |
| 189 | | var unlocked_registers = self.locked_registers; |
| 190 | | unlocked_registers.toggleAll(); |
| 191 | | |
| 192 | | free_and_not_locked_registers.setIntersection(unlocked_registers); |
| 193 | | |
| 194 | | if (free_and_not_locked_registers.count() < count) return null; |
| 195 | const free_registers = self.free_registers & register_class; |
| 196 | const free_and_not_locked_registers = free_registers & ~self.locked_registers; |
| 197 | const free_and_not_locked_registers_count = @popCount(RegisterBitSet, free_and_not_locked_registers); |
| 198 | if (free_and_not_locked_registers_count < count) return null; |
| 195 | 199 | |
| 196 | 200 | var regs: [count]Register = undefined; |
| 197 | 201 | var i: usize = 0; |
| ... | ... | @@ -238,10 +242,10 @@ pub fn RegisterManager( |
| 238 | 242 | ) AllocateRegistersError![count]Register { |
| 239 | 243 | comptime assert(count > 0 and count <= tracked_registers.len); |
| 240 | 244 | |
| 241 | | var locked_registers = self.locked_registers; |
| 242 | | locked_registers.setIntersection(register_class); |
| 243 | | |
| 244 | | if (count > register_class.count() - locked_registers.count()) return error.OutOfRegisters; |
| 245 | const available_registers_count = @popCount(RegisterBitSet, register_class); |
| 246 | const locked_registers = self.locked_registers & register_class; |
| 247 | const locked_registers_count = @popCount(RegisterBitSet, locked_registers); |
| 248 | if (count > available_registers_count - locked_registers_count) return error.OutOfRegisters; |
| 245 | 249 | |
| 246 | 250 | const result = self.tryAllocRegs(count, insts, register_class) orelse blk: { |
| 247 | 251 | // We'll take over the first count registers. Spill |
| ... | ... | @@ -348,6 +352,334 @@ pub fn RegisterManager( |
| 348 | 352 | }; |
| 349 | 353 | } |
| 350 | 354 | |
| 355 | // TODO delete current implementation of RegisterManager above, and uncomment the one |
| 356 | // below once #11680 is fixed: |
| 357 | // https://github.com/ziglang/zig/issues/11680 |
| 358 | |
| 359 | //pub fn RegisterManager( |
| 360 | // comptime Function: type, |
| 361 | // comptime Register: type, |
| 362 | // comptime tracked_registers: []const Register, |
| 363 | //) type { |
| 364 | // // architectures which do not have a concept of registers should |
| 365 | // // refrain from using RegisterManager |
| 366 | // assert(tracked_registers.len > 0); // see note above |
| 367 | |
| 368 | // return struct { |
| 369 | // /// Tracks the AIR instruction allocated to every register. If |
| 370 | // /// no instruction is allocated to a register (i.e. the |
| 371 | // /// register is free), the value in that slot is undefined. |
| 372 | // /// |
| 373 | // /// The key must be canonical register. |
| 374 | // registers: [tracked_registers.len]Air.Inst.Index = undefined, |
| 375 | // /// Tracks which registers are free (in which case the |
| 376 | // /// corresponding bit is set to 1) |
| 377 | // free_registers: RegisterBitSet = RegisterBitSet.initFull(), |
| 378 | // /// Tracks all registers allocated in the course of this |
| 379 | // /// function |
| 380 | // allocated_registers: RegisterBitSet = RegisterBitSet.initEmpty(), |
| 381 | // /// Tracks registers which are locked from being allocated |
| 382 | // locked_registers: RegisterBitSet = RegisterBitSet.initEmpty(), |
| 383 | |
| 384 | // const Self = @This(); |
| 385 | |
| 386 | // pub const RegisterBitSet = StaticBitSet(tracked_registers.len); |
| 387 | |
| 388 | // fn getFunction(self: *Self) *Function { |
| 389 | // return @fieldParentPtr(Function, "register_manager", self); |
| 390 | // } |
| 391 | |
| 392 | // fn excludeRegister(reg: Register, register_class: RegisterBitSet) bool { |
| 393 | // const index = indexOfRegIntoTracked(reg) orelse return true; |
| 394 | // return !register_class.isSet(index); |
| 395 | // } |
| 396 | |
| 397 | // fn markRegAllocated(self: *Self, reg: Register) void { |
| 398 | // const index = indexOfRegIntoTracked(reg) orelse return; |
| 399 | // self.allocated_registers.set(index); |
| 400 | // } |
| 401 | |
| 402 | // fn markRegUsed(self: *Self, reg: Register) void { |
| 403 | // const index = indexOfRegIntoTracked(reg) orelse return; |
| 404 | // self.free_registers.unset(index); |
| 405 | // } |
| 406 | |
| 407 | // fn markRegFree(self: *Self, reg: Register) void { |
| 408 | // const index = indexOfRegIntoTracked(reg) orelse return; |
| 409 | // self.free_registers.set(index); |
| 410 | // } |
| 411 | |
| 412 | // pub fn indexOfReg( |
| 413 | // comptime registers: []const Register, |
| 414 | // reg: Register, |
| 415 | // ) ?std.math.IntFittingRange(0, registers.len - 1) { |
| 416 | // inline for (tracked_registers) |cpreg, i| { |
| 417 | // if (reg.id() == cpreg.id()) return i; |
| 418 | // } |
| 419 | // return null; |
| 420 | // } |
| 421 | |
| 422 | // pub fn indexOfRegIntoTracked(reg: Register) ?RegisterBitSet.ShiftInt { |
| 423 | // return indexOfReg(tracked_registers, reg); |
| 424 | // } |
| 425 | |
| 426 | // /// Returns true when this register is not tracked |
| 427 | // pub fn isRegFree(self: Self, reg: Register) bool { |
| 428 | // const index = indexOfRegIntoTracked(reg) orelse return true; |
| 429 | // return self.free_registers.isSet(index); |
| 430 | // } |
| 431 | |
| 432 | // /// Returns whether this register was allocated in the course |
| 433 | // /// of this function. |
| 434 | // /// |
| 435 | // /// Returns false when this register is not tracked |
| 436 | // pub fn isRegAllocated(self: Self, reg: Register) bool { |
| 437 | // const index = indexOfRegIntoTracked(reg) orelse return false; |
| 438 | // return self.allocated_registers.isSet(index); |
| 439 | // } |
| 440 | |
| 441 | // /// Returns whether this register is locked |
| 442 | // /// |
| 443 | // /// Returns false when this register is not tracked |
| 444 | // pub fn isRegLocked(self: Self, reg: Register) bool { |
| 445 | // const index = indexOfRegIntoTracked(reg) orelse return false; |
| 446 | // return self.locked_registers.isSet(index); |
| 447 | // } |
| 448 | |
| 449 | // pub const RegisterLock = struct { |
| 450 | // register: Register, |
| 451 | // }; |
| 452 | |
| 453 | // /// Prevents the register from being allocated until they are |
| 454 | // /// unlocked again. |
| 455 | // /// Returns `RegisterLock` if the register was not already |
| 456 | // /// locked, or `null` otherwise. |
| 457 | // /// Only the owner of the `RegisterLock` can unlock the |
| 458 | // /// register later. |
| 459 | // pub fn lockReg(self: *Self, reg: Register) ?RegisterLock { |
| 460 | // log.debug("locking {}", .{reg}); |
| 461 | // if (self.isRegLocked(reg)) { |
| 462 | // log.debug(" register already locked", .{}); |
| 463 | // return null; |
| 464 | // } |
| 465 | // const index = indexOfRegIntoTracked(reg) orelse return null; |
| 466 | // self.locked_registers.set(index); |
| 467 | // return RegisterLock{ .register = reg }; |
| 468 | // } |
| 469 | |
| 470 | // /// Like `lockReg` but asserts the register was unused always |
| 471 | // /// returning a valid lock. |
| 472 | // pub fn lockRegAssumeUnused(self: *Self, reg: Register) RegisterLock { |
| 473 | // log.debug("locking asserting free {}", .{reg}); |
| 474 | // assert(!self.isRegLocked(reg)); |
| 475 | // const index = indexOfRegIntoTracked(reg) orelse unreachable; |
| 476 | // self.locked_registers.set(index); |
| 477 | // return RegisterLock{ .register = reg }; |
| 478 | // } |
| 479 | |
| 480 | // /// Like `lockRegAssumeUnused` but locks multiple registers. |
| 481 | // pub fn lockRegsAssumeUnused( |
| 482 | // self: *Self, |
| 483 | // comptime count: comptime_int, |
| 484 | // regs: [count]Register, |
| 485 | // ) [count]RegisterLock { |
| 486 | // var buf: [count]RegisterLock = undefined; |
| 487 | // for (regs) |reg, i| { |
| 488 | // buf[i] = self.lockRegAssumeUnused(reg); |
| 489 | // } |
| 490 | // return buf; |
| 491 | // } |
| 492 | |
| 493 | // /// Unlocks the register allowing its re-allocation and re-use. |
| 494 | // /// Requires `RegisterLock` to unlock a register. |
| 495 | // /// Call `lockReg` to obtain the lock first. |
| 496 | // pub fn unlockReg(self: *Self, lock: RegisterLock) void { |
| 497 | // log.debug("unlocking {}", .{lock.register}); |
| 498 | // const index = indexOfRegIntoTracked(lock.register) orelse return; |
| 499 | // self.locked_registers.unset(index); |
| 500 | // } |
| 501 | |
| 502 | // /// Returns true when at least one register is locked |
| 503 | // pub fn lockedRegsExist(self: Self) bool { |
| 504 | // return self.locked_registers.count() > 0; |
| 505 | // } |
| 506 | |
| 507 | // /// Allocates a specified number of registers, optionally |
| 508 | // /// tracking them. Returns `null` if not enough registers are |
| 509 | // /// free. |
| 510 | // pub fn tryAllocRegs( |
| 511 | // self: *Self, |
| 512 | // comptime count: comptime_int, |
| 513 | // insts: [count]?Air.Inst.Index, |
| 514 | // register_class: RegisterBitSet, |
| 515 | // ) ?[count]Register { |
| 516 | // comptime assert(count > 0 and count <= tracked_registers.len); |
| 517 | |
| 518 | // var free_and_not_locked_registers = self.free_registers; |
| 519 | // free_and_not_locked_registers.setIntersection(register_class); |
| 520 | |
| 521 | // var unlocked_registers = self.locked_registers; |
| 522 | // unlocked_registers.toggleAll(); |
| 523 | |
| 524 | // free_and_not_locked_registers.setIntersection(unlocked_registers); |
| 525 | |
| 526 | // if (free_and_not_locked_registers.count() < count) return null; |
| 527 | |
| 528 | // var regs: [count]Register = undefined; |
| 529 | // var i: usize = 0; |
| 530 | // for (tracked_registers) |reg| { |
| 531 | // if (i >= count) break; |
| 532 | // if (excludeRegister(reg, register_class)) continue; |
| 533 | // if (self.isRegLocked(reg)) continue; |
| 534 | // if (!self.isRegFree(reg)) continue; |
| 535 | |
| 536 | // regs[i] = reg; |
| 537 | // i += 1; |
| 538 | // } |
| 539 | // assert(i == count); |
| 540 | |
| 541 | // for (regs) |reg, j| { |
| 542 | // self.markRegAllocated(reg); |
| 543 | |
| 544 | // if (insts[j]) |inst| { |
| 545 | // // Track the register |
| 546 | // const index = indexOfRegIntoTracked(reg).?; // indexOfReg() on a callee-preserved reg should never return null |
| 547 | // self.registers[index] = inst; |
| 548 | // self.markRegUsed(reg); |
| 549 | // } |
| 550 | // } |
| 551 | |
| 552 | // return regs; |
| 553 | // } |
| 554 | |
| 555 | // /// Allocates a register and optionally tracks it with a |
| 556 | // /// corresponding instruction. Returns `null` if all registers |
| 557 | // /// are allocated. |
| 558 | // pub fn tryAllocReg(self: *Self, inst: ?Air.Inst.Index, register_class: RegisterBitSet) ?Register { |
| 559 | // return if (tryAllocRegs(self, 1, .{inst}, register_class)) |regs| regs[0] else null; |
| 560 | // } |
| 561 | |
| 562 | // /// Allocates a specified number of registers, optionally |
| 563 | // /// tracking them. Asserts that count is not |
| 564 | // /// larger than the total number of registers available. |
| 565 | // pub fn allocRegs( |
| 566 | // self: *Self, |
| 567 | // comptime count: comptime_int, |
| 568 | // insts: [count]?Air.Inst.Index, |
| 569 | // register_class: RegisterBitSet, |
| 570 | // ) AllocateRegistersError![count]Register { |
| 571 | // comptime assert(count > 0 and count <= tracked_registers.len); |
| 572 | |
| 573 | // var locked_registers = self.locked_registers; |
| 574 | // locked_registers.setIntersection(register_class); |
| 575 | |
| 576 | // if (count > register_class.count() - locked_registers.count()) return error.OutOfRegisters; |
| 577 | |
| 578 | // const result = self.tryAllocRegs(count, insts, register_class) orelse blk: { |
| 579 | // // We'll take over the first count registers. Spill |
| 580 | // // the instructions that were previously there to a |
| 581 | // // stack allocations. |
| 582 | // var regs: [count]Register = undefined; |
| 583 | // var i: usize = 0; |
| 584 | // for (tracked_registers) |reg| { |
| 585 | // if (i >= count) break; |
| 586 | // if (excludeRegister(reg, register_class)) break; |
| 587 | // if (self.isRegLocked(reg)) continue; |
| 588 | |
| 589 | // regs[i] = reg; |
| 590 | // self.markRegAllocated(reg); |
| 591 | // const index = indexOfRegIntoTracked(reg).?; // indexOfReg() on a callee-preserved reg should never return null |
| 592 | // if (insts[i]) |inst| { |
| 593 | // // Track the register |
| 594 | // if (self.isRegFree(reg)) { |
| 595 | // self.markRegUsed(reg); |
| 596 | // } else { |
| 597 | // const spilled_inst = self.registers[index]; |
| 598 | // try self.getFunction().spillInstruction(reg, spilled_inst); |
| 599 | // } |
| 600 | // self.registers[index] = inst; |
| 601 | // } else { |
| 602 | // // Don't track the register |
| 603 | // if (!self.isRegFree(reg)) { |
| 604 | // const spilled_inst = self.registers[index]; |
| 605 | // try self.getFunction().spillInstruction(reg, spilled_inst); |
| 606 | // self.freeReg(reg); |
| 607 | // } |
| 608 | // } |
| 609 | |
| 610 | // i += 1; |
| 611 | // } |
| 612 | |
| 613 | // break :blk regs; |
| 614 | // }; |
| 615 | |
| 616 | // log.debug("allocated registers {any} for insts {any}", .{ result, insts }); |
| 617 | // return result; |
| 618 | // } |
| 619 | |
| 620 | // /// Allocates a register and optionally tracks it with a |
| 621 | // /// corresponding instruction. |
| 622 | // pub fn allocReg( |
| 623 | // self: *Self, |
| 624 | // inst: ?Air.Inst.Index, |
| 625 | // register_class: RegisterBitSet, |
| 626 | // ) AllocateRegistersError!Register { |
| 627 | // return (try self.allocRegs(1, .{inst}, register_class))[0]; |
| 628 | // } |
| 629 | |
| 630 | // /// Spills the register if it is currently allocated. If a |
| 631 | // /// corresponding instruction is passed, will also track this |
| 632 | // /// register. |
| 633 | // pub fn getReg(self: *Self, reg: Register, inst: ?Air.Inst.Index) AllocateRegistersError!void { |
| 634 | // const index = indexOfRegIntoTracked(reg) orelse return; |
| 635 | // log.debug("getReg {} for inst {}", .{ reg, inst }); |
| 636 | // self.markRegAllocated(reg); |
| 637 | |
| 638 | // if (inst) |tracked_inst| |
| 639 | // if (!self.isRegFree(reg)) { |
| 640 | // // Move the instruction that was previously there to a |
| 641 | // // stack allocation. |
| 642 | // const spilled_inst = self.registers[index]; |
| 643 | // self.registers[index] = tracked_inst; |
| 644 | // try self.getFunction().spillInstruction(reg, spilled_inst); |
| 645 | // } else { |
| 646 | // self.getRegAssumeFree(reg, tracked_inst); |
| 647 | // } |
| 648 | // else { |
| 649 | // if (!self.isRegFree(reg)) { |
| 650 | // // Move the instruction that was previously there to a |
| 651 | // // stack allocation. |
| 652 | // const spilled_inst = self.registers[index]; |
| 653 | // try self.getFunction().spillInstruction(reg, spilled_inst); |
| 654 | // self.freeReg(reg); |
| 655 | // } |
| 656 | // } |
| 657 | // } |
| 658 | |
| 659 | // /// Allocates the specified register with the specified |
| 660 | // /// instruction. Asserts that the register is free and no |
| 661 | // /// spilling is necessary. |
| 662 | // pub fn getRegAssumeFree(self: *Self, reg: Register, inst: Air.Inst.Index) void { |
| 663 | // const index = indexOfRegIntoTracked(reg) orelse return; |
| 664 | // log.debug("getRegAssumeFree {} for inst {}", .{ reg, inst }); |
| 665 | // self.markRegAllocated(reg); |
| 666 | |
| 667 | // assert(self.isRegFree(reg)); |
| 668 | // self.registers[index] = inst; |
| 669 | // self.markRegUsed(reg); |
| 670 | // } |
| 671 | |
| 672 | // /// Marks the specified register as free |
| 673 | // pub fn freeReg(self: *Self, reg: Register) void { |
| 674 | // const index = indexOfRegIntoTracked(reg) orelse return; |
| 675 | // log.debug("freeing register {}", .{reg}); |
| 676 | |
| 677 | // self.registers[index] = undefined; |
| 678 | // self.markRegFree(reg); |
| 679 | // } |
| 680 | // }; |
| 681 | //} |
| 682 | |
| 351 | 683 | const MockRegister1 = enum(u2) { |
| 352 | 684 | r0, |
| 353 | 685 | r1, |
| ... | ... | @@ -384,7 +716,7 @@ fn MockFunction(comptime Register: type) type { |
| 384 | 716 | |
| 385 | 717 | const RegisterManagerT = RegisterManager(Self, Register, &Register.allocatable_registers); |
| 386 | 718 | |
| 387 | | pub const reg_class: RegisterManagerT.RegisterBitSet = RegisterManagerT.RegisterBitSet.initFull(); |
| 719 | pub const reg_class: RegisterManagerT.RegisterBitSet = math.maxInt(RegisterManagerT.RegisterBitSet); |
| 388 | 720 | |
| 389 | 721 | pub fn deinit(self: *Self) void { |
| 390 | 722 | self.spilled.deinit(self.allocator); |
Jakub Konka <kubkon@jakubkonka.com> 2022-05-20 00:04:56+02:00