| ... | ... | @@ -131,6 +131,8 @@ pub fn lowerMir(emit: *Emit) InnerError!void { |
| 131 | 131 | |
| 132 | 132 | .movabs => try emit.mirMovabs(inst), |
| 133 | 133 | |
| 134 | .fisttp => try emit.mirFisttp(inst), |
| 135 | |
| 134 | 136 | .lea => try emit.mirLea(inst), |
| 135 | 137 | .lea_pie => try emit.mirLeaPie(inst), |
| 136 | 138 | |
| ... | ... | @@ -686,6 +688,28 @@ fn mirMovabs(emit: *Emit, inst: Mir.Inst.Index) InnerError!void { |
| 686 | 688 | return lowerToFdEnc(.mov, ops.reg1, imm, emit.code); |
| 687 | 689 | } |
| 688 | 690 | |
| 691 | fn mirFisttp(emit: *Emit, inst: Mir.Inst.Index) InnerError!void { |
| 692 | const tag = emit.mir.instructions.items(.tag)[inst]; |
| 693 | assert(tag == .fisttp); |
| 694 | const ops = Mir.Ops.decode(emit.mir.instructions.items(.ops)[inst]); |
| 695 | |
| 696 | // the selecting between operand sizes for this particular `fisttp` instruction |
| 697 | // is done via opcode instead of the usual prefixes. |
| 698 | |
| 699 | const opcode: Tag = switch (ops.flags) { |
| 700 | 0b00 => .fisttp16, |
| 701 | 0b01 => .fisttp32, |
| 702 | 0b10 => .fisttp64, |
| 703 | else => unreachable, |
| 704 | }; |
| 705 | const mem_or_reg = Memory{ |
| 706 | .base = ops.reg1, |
| 707 | .disp = emit.mir.instructions.items(.data)[inst].imm, |
| 708 | .ptr_size = Memory.PtrSize.dword_ptr, // to prevent any prefix from being used |
| 709 | }; |
| 710 | return lowerToMEnc(opcode, .{ .memory = mem_or_reg }, emit.code); |
| 711 | } |
| 712 | |
| 689 | 713 | fn mirShift(emit: *Emit, tag: Tag, inst: Mir.Inst.Index) InnerError!void { |
| 690 | 714 | const ops = Mir.Ops.decode(emit.mir.instructions.items(.ops)[inst]); |
| 691 | 715 | switch (ops.flags) { |
| ... | ... | @@ -1114,6 +1138,9 @@ const Tag = enum { |
| 1114 | 1138 | syscall, |
| 1115 | 1139 | ret_near, |
| 1116 | 1140 | ret_far, |
| 1141 | fisttp16, |
| 1142 | fisttp32, |
| 1143 | fisttp64, |
| 1117 | 1144 | jo, |
| 1118 | 1145 | jno, |
| 1119 | 1146 | jb, |
| ... | ... | @@ -1352,6 +1379,9 @@ inline fn getOpCode(tag: Tag, enc: Encoding, is_one_byte: bool) ?OpCode { |
| 1352 | 1379 | .setle, .setng => OpCode.twoByte(0x0f, 0x9e), |
| 1353 | 1380 | .setnle, .setg => OpCode.twoByte(0x0f, 0x9f), |
| 1354 | 1381 | .idiv, .div, .imul => OpCode.oneByte(if (is_one_byte) 0xf6 else 0xf7), |
| 1382 | .fisttp16 => OpCode.oneByte(0xdf), |
| 1383 | .fisttp32 => OpCode.oneByte(0xdb), |
| 1384 | .fisttp64 => OpCode.oneByte(0xdd), |
| 1355 | 1385 | else => null, |
| 1356 | 1386 | }, |
| 1357 | 1387 | .o => return switch (tag) { |
| ... | ... | @@ -1492,6 +1522,9 @@ inline fn getModRmExt(tag: Tag) ?u3 { |
| 1492 | 1522 | .imul => 0x5, |
| 1493 | 1523 | .idiv => 0x7, |
| 1494 | 1524 | .div => 0x6, |
| 1525 | .fisttp16 => 0x1, |
| 1526 | .fisttp32 => 0x1, |
| 1527 | .fisttp64 => 0x1, |
| 1495 | 1528 | else => null, |
| 1496 | 1529 | }; |
| 1497 | 1530 | } |
mparadinha <miguel.p.paradinha@gmail.com> 2022-03-14 15:00:45+00:00