mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-04-26 13:01:34 +03:00
Pavel Verigo
78 lines
3.4 KiB
Zig
78 lines
3.4 KiB
Zig
const builtin = @import("builtin");
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const endian = builtin.cpu.arch.endian();
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const std = @import("std");
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const compiler_rt = @import("../compiler_rt.zig");
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const udivmod = @import("udivmodei4.zig").divmod;
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const symbol = @import("../compiler_rt.zig").symbol;
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comptime {
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symbol(&__divei4, "__divei4");
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symbol(&__modei4, "__modei4");
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symbol(&__divei5, "__divei5");
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symbol(&__modei5, "__modei5");
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}
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inline fn limb(i: usize, len: usize) usize {
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return if (endian == .little) i else len - 1 - i;
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}
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inline fn neg(out: []u32, in: []const u32) void {
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var ov: u1 = 1;
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for (0..in.len) |limb_index| {
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const new, ov = @addWithOverflow(~in[limb(limb_index, in.len)], ov);
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out[limb(limb_index, out.len)] = new;
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}
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}
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fn divmod(q: ?[]u32, r: ?[]u32, u: []const u32, v: []const u32, tu: []u32, tv: []u32) !void {
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const u_sign: i32 = @bitCast(u[limb(u.len - 1, u.len)]);
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const v_sign: i32 = @bitCast(v[limb(v.len - 1, v.len)]);
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if (u_sign < 0) neg(tu, u);
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if (v_sign < 0) neg(tv, v);
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try @call(.always_inline, udivmod, .{ q, r, if (u_sign < 0) tu else u, if (v_sign < 0) tv else v });
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if (q) |x| if (u_sign ^ v_sign < 0) neg(x, x);
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if (r) |x| if (u_sign < 0) neg(x, x);
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}
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pub fn __divei4(q_p: [*]u8, u_p: [*]u8, v_p: [*]u8, bits: usize) callconv(.c) void {
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@setRuntimeSafety(compiler_rt.test_safety);
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const byte_size = std.zig.target.intByteSize(&builtin.target, @intCast(bits));
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const q: []u32 = @ptrCast(@alignCast(q_p[0..byte_size]));
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const u: []u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
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const v: []u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
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@call(.always_inline, divmod, .{ q, null, u, v, u, v }) catch unreachable;
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}
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pub fn __modei4(r_p: [*]u8, u_p: [*]u8, v_p: [*]u8, bits: usize) callconv(.c) void {
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@setRuntimeSafety(compiler_rt.test_safety);
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const byte_size = std.zig.target.intByteSize(&builtin.target, @intCast(bits));
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const r: []u32 = @ptrCast(@alignCast(r_p[0..byte_size]));
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const u: []u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
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const v: []u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
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@call(.always_inline, divmod, .{ null, r, u, v, u, v }) catch unreachable;
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}
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pub fn __divei5(q_p: [*]u8, u_p: [*]const u8, v_p: [*]const u8, t_p: [*]u8, bits: usize) callconv(.c) void {
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@setRuntimeSafety(compiler_rt.test_safety);
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const byte_size = std.zig.target.intByteSize(&builtin.target, @intCast(bits));
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const q: []u32 = @ptrCast(@alignCast(q_p[0..byte_size]));
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const u: []const u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
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const v: []const u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
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const tu: []u32 = @ptrCast(@alignCast(t_p[0..byte_size]));
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const tv: []u32 = @ptrCast(@alignCast(t_p[byte_size..][0..byte_size]));
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@call(.always_inline, divmod, .{ q, null, u, v, tu, tv }) catch unreachable;
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}
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pub fn __modei5(r_p: [*]u8, u_p: [*]const u8, v_p: [*]const u8, t_p: [*]u8, bits: usize) callconv(.c) void {
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@setRuntimeSafety(compiler_rt.test_safety);
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const byte_size = std.zig.target.intByteSize(&builtin.target, @intCast(bits));
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const r: []u32 = @ptrCast(@alignCast(r_p[0..byte_size]));
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const u: []const u32 = @ptrCast(@alignCast(u_p[0..byte_size]));
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const v: []const u32 = @ptrCast(@alignCast(v_p[0..byte_size]));
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const tu: []u32 = @ptrCast(@alignCast(t_p[0..byte_size]));
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const tv: []u32 = @ptrCast(@alignCast(t_p[byte_size..][0..byte_size]));
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@call(.always_inline, divmod, .{ null, r, u, v, tu, tv }) catch unreachable;
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}
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