42 lines
1.1 KiB
Zig
42 lines
1.1 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const udivmod = @import("udivmod.zig").udivmod;
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const arch = builtin.cpu.arch;
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const common = @import("common.zig");
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pub const panic = common.panic;
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comptime {
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if (common.want_windows_v2u64_abi) {
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@export(__divti3_windows_x86_64, .{ .name = "__divti3", .linkage = common.linkage, .visibility = common.visibility });
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} else {
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@export(__divti3, .{ .name = "__divti3", .linkage = common.linkage, .visibility = common.visibility });
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}
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}
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pub fn __divti3(a: i128, b: i128) callconv(.C) i128 {
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return div(a, b);
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}
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const v128 = @Vector(2, u64);
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fn __divti3_windows_x86_64(a: v128, b: v128) callconv(.C) v128 {
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return @bitCast(div(@bitCast(a), @bitCast(b)));
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}
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inline fn div(a: i128, b: i128) i128 {
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const s_a = a >> (128 - 1);
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const s_b = b >> (128 - 1);
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const an = (a ^ s_a) -% s_a;
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const bn = (b ^ s_b) -% s_b;
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const r = udivmod(u128, @bitCast(an), @bitCast(bn), null);
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const s = s_a ^ s_b;
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return (@as(i128, @bitCast(r)) ^ s) -% s;
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}
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test {
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_ = @import("divti3_test.zig");
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}
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