diff options
Diffstat (limited to 'src/codegen/c.zig')
| -rw-r--r-- | src/codegen/c.zig | 80 |
1 files changed, 63 insertions, 17 deletions
diff --git a/src/codegen/c.zig b/src/codegen/c.zig index 75864669c9..6e4db6ddbf 100644 --- a/src/codegen/c.zig +++ b/src/codegen/c.zig @@ -3350,21 +3350,49 @@ fn airIntCast(f: *Function, inst: Air.Inst.Index) !CValue { const writer = f.object.writer(); const inst_ty = f.air.typeOfIndex(inst); const local = try f.allocLocal(inst, inst_ty); + const inst_bits = inst_ty.bitSize(target); + const inst_int_info = inst_ty.intInfo(target); + const operand_ty = f.air.typeOf(ty_op.operand); + const operand_bits = operand_ty.bitSize(target); + const operand_int_info = operand_ty.intInfo(target); + try f.writeCValue(writer, local, .Other); try writer.writeAll(" = "); - const cant_cast = inst_ty.isInt() and inst_ty.bitSize(target) > 64; - if (cant_cast) { - if (f.air.typeOf(ty_op.operand).bitSize(target) > 64) return f.fail("TODO: C backend: implement casting between types > 64 bits", .{}); + + if (inst_bits <= 64 and operand_bits <= 64) { + if (toCIntBits(inst_int_info.bits) != toCIntBits(operand_int_info.bits) or inst_int_info.signedness != operand_int_info.signedness) { + try writer.writeByte('('); + try f.renderTypecast(writer, inst_ty); + try writer.writeByte(')'); + } + + try f.writeCValue(writer, operand, .Other); + } else if (inst_bits > 64 and operand_bits <= 64) { try writer.writeAll("zig_as_"); try f.object.dg.renderTypeForBuiltinFnName(writer, inst_ty); - try writer.writeAll("(0, "); - } else { + try writer.writeAll("(0, "); // TODO: Should the 0 go through fmtIntLiteral? + try f.writeCValue(writer, operand, .FunctionArgument); + try writer.writeByte(')'); + } else if (inst_bits <= 64 and operand_bits > 64) { + try writer.writeAll("zig_lo_"); + try f.object.dg.renderTypeForBuiltinFnName(writer, operand_ty); try writer.writeByte('('); - try f.renderTypecast(writer, inst_ty); + try f.writeCValue(writer, operand, .FunctionArgument); try writer.writeByte(')'); + } else { + try writer.writeAll("zig_as_"); + try f.object.dg.renderTypeForBuiltinFnName(writer, inst_ty); + try writer.writeAll("(zig_hi_"); + try f.object.dg.renderTypeForBuiltinFnName(writer, operand_ty); + try writer.writeByte('('); + try f.writeCValue(writer, operand, .FunctionArgument); + try writer.writeAll("), zig_lo_"); + try f.object.dg.renderTypeForBuiltinFnName(writer, operand_ty); + try writer.writeByte('('); + try f.writeCValue(writer, operand, .FunctionArgument); + try writer.writeAll("))"); } - try f.writeCValue(writer, operand, .Other); - if (cant_cast) try writer.writeByte(')'); + try writer.writeAll(";\n"); return local; } @@ -3384,15 +3412,29 @@ fn airTrunc(f: *Function, inst: Air.Inst.Index) !CValue { const target = f.object.dg.module.getTarget(); const dest_int_info = inst_ty.intInfo(target); const dest_bits = dest_int_info.bits; + const dest_c_bits = toCIntBits(dest_int_info.bits) orelse + return f.fail("TODO: C backend: implement integer types larger than 128 bits", .{}); + const operand_ty = f.air.typeOf(ty_op.operand); + const operand_int_info = operand_ty.intInfo(target); try f.writeCValue(writer, local, .Other); - try writer.writeAll(" = ("); - try f.renderTypecast(writer, inst_ty); - try writer.writeByte(')'); + try writer.writeAll(" = "); + + const needs_lo = operand_int_info.bits > 64 and dest_bits <= 64; + if (!needs_lo or dest_c_bits != 64 or dest_int_info.signedness != operand_int_info.signedness) { + try writer.writeByte('('); + try f.renderTypecast(writer, inst_ty); + try writer.writeByte(')'); + } + + if (needs_lo) { + try writer.writeAll("zig_lo_"); + try f.object.dg.renderTypeForBuiltinFnName(writer, operand_ty); + try writer.writeByte('('); + } if (dest_bits >= 8 and std.math.isPowerOfTwo(dest_bits)) { try f.writeCValue(writer, operand, .Other); - try writer.writeAll(";\n"); } else switch (dest_int_info.signedness) { .unsigned => { var arena = std.heap.ArenaAllocator.init(f.object.dg.gpa); @@ -3404,13 +3446,13 @@ fn airTrunc(f: *Function, inst: Air.Inst.Index) !CValue { const mask_val = try inst_ty.maxInt(stack.get(), target); + // TODO: This needs to use _and_ to do this to support > 64 bits and !zig_has_int128 try writer.writeByte('('); try f.writeCValue(writer, operand, .Other); - try writer.print(" & {x});\n", .{try f.fmtIntLiteral(inst_ty, mask_val)}); + try writer.print(" & {x})", .{try f.fmtIntLiteral(inst_ty, mask_val)}); }, .signed => { - const operand_ty = f.air.typeOf(ty_op.operand); - const c_bits = toCIntBits(operand_ty.intInfo(target).bits) orelse + const c_bits = toCIntBits(operand_int_info.bits) orelse return f.fail("TODO: C backend: implement integer types larger than 128 bits", .{}); var shift_pl = Value.Payload.U64{ .base = .{ .tag = .int_u64 }, @@ -3418,11 +3460,15 @@ fn airTrunc(f: *Function, inst: Air.Inst.Index) !CValue { }; const shift_val = Value.initPayload(&shift_pl.base); + // TODO: This needs to use shl and shr to do this to support > 64 bits and !zig_has_int128 try writer.print("((int{d}_t)((uint{0d}_t)", .{c_bits}); try f.writeCValue(writer, operand, .Other); - try writer.print(" << {}) >> {0});\n", .{try f.fmtIntLiteral(Type.u8, shift_val)}); + try writer.print(" << {}) >> {0})", .{try f.fmtIntLiteral(Type.u8, shift_val)}); }, } + + if (needs_lo) try writer.writeByte(')'); + try writer.writeAll(";\n"); return local; } @@ -7010,9 +7056,9 @@ fn formatIntLiteral( return writer.print("{s}_{s}", .{ abbrev, if (int.positive) "MAX" else "MIN" }); } - // TODO: If > 64 bit, need to use a subtract from zero fn here instead of negate if (!int.positive) { if (c_bits > 64) { + // TODO: Could use negate function instead? try writer.print("zig_sub_{c}{d}(zig_as_{c}{d}(0, 0), ", .{ signAbbrev(int_info.signedness), c_bits, signAbbrev(int_info.signedness), c_bits }); } else { try writer.writeByte('-'); |