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stage2: create generic lowering fns for MI, RM, and MR encodings

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This way I am hopeful they can be reused for every MIR lowering
function which follows a given encoding. Currently, support MI,
RM and MR encodings without SIB scaling.
This commit is contained in:
Jakub Konka
2021-12-21 16:52:50 +01:00
parent 5156ccd552
commit 2b5de9403d
3 changed files with 390 additions and 693 deletions
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1071
src/arch/x86_64/Emit.zig
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File diff suppressed because it is too large Load Diff

6
src/arch/x86_64/Mir.zig
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@@ -380,14 +380,14 @@ pub const Ops = struct {
}
};
pub fn extraData(mir_extra: []const u32, comptime T: type, index: usize) struct { data: T, end: usize } {
pub fn extraData(mir: Mir, comptime T: type, index: usize) struct { data: T, end: usize } {
const fields = std.meta.fields(T);
var i: usize = index;
var result: T = undefined;
inline for (fields) |field| {
@field(result, field.name) = switch (field.field_type) {
u32 => mir_extra[i],
i32 => @bitCast(i32, mir_extra[i]),
u32 => mir.extra[i],
i32 => @bitCast(i32, mir.extra[i]),
else => @compileError("bad field type"),
};
i += 1;

6
src/arch/x86_64/PrintMir.zig
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@@ -481,7 +481,7 @@ fn mirArith(print: *const Print, tag: Mir.Inst.Tag, inst: Mir.Inst.Index, w: any
0b11 => {
if (ops.reg2 == .none) {
const payload = print.mir.instructions.items(.data)[inst].payload;
const imm_pair = Mir.extraData(print.mir.extra, Mir.ImmPair, payload).data;
const imm_pair = print.mir.extraData(Mir.ImmPair, payload).data;
try w.print("[{s} + {d}], {d}", .{ @tagName(ops.reg1), imm_pair.dest_off, imm_pair.operand });
}
try w.writeAll("TODO");
@@ -516,7 +516,7 @@ fn mirArithScaleImm(print: *const Print, tag: Mir.Inst.Tag, inst: Mir.Inst.Index
const ops = Mir.Ops.decode(print.mir.instructions.items(.ops)[inst]);
const scale = ops.flags;
const payload = print.mir.instructions.items(.data)[inst].payload;
const imm_pair = Mir.extraData(print.mir.extra, Mir.ImmPair, payload).data;
const imm_pair = print.mir.extraData(Mir.ImmPair, payload).data;
try w.print("{s} [{s} + {d}*rcx + {d}], {d}\n", .{ @tagName(tag), @tagName(ops.reg1), scale, imm_pair.dest_off, imm_pair.operand });
}
@@ -528,7 +528,7 @@ fn mirMovabs(print: *const Print, inst: Mir.Inst.Index, w: anytype) !void {
const is_64 = ops.reg1.size() == 64;
const imm: i128 = if (is_64) blk: {
const payload = print.mir.instructions.items(.data)[inst].payload;
const imm64 = Mir.extraData(print.mir.extra, Mir.Imm64, payload).data;
const imm64 = print.mir.extraData(Mir.Imm64, payload).data;
break :blk imm64.decode();
} else print.mir.instructions.items(.data)[inst].imm;
if (ops.flags == 0b00) {