bb8971150c
This is just a cosmetic change. The goal is to keep the export logic relatively flat and centralized.
45 lines
1.3 KiB
Zig
45 lines
1.3 KiB
Zig
//! Ported from:
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//!
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//! https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/lib/builtins/modti3.c
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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 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(__modti3_windows_x86_64, .{ .name = "__modti3", .linkage = common.linkage });
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} else {
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@export(__modti3, .{ .name = "__modti3", .linkage = common.linkage });
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}
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}
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pub fn __modti3(a: i128, b: i128) callconv(.C) i128 {
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return mod(a, b);
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}
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const v2u64 = @Vector(2, u64);
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fn __modti3_windows_x86_64(a: v2u64, b: v2u64) callconv(.C) v2u64 {
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return @bitCast(v2u64, mod(@bitCast(i128, a), @bitCast(i128, b)));
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}
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inline fn mod(a: i128, b: i128) i128 {
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const s_a = a >> (128 - 1); // s = a < 0 ? -1 : 0
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const s_b = b >> (128 - 1); // s = b < 0 ? -1 : 0
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const an = (a ^ s_a) -% s_a; // negate if s == -1
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const bn = (b ^ s_b) -% s_b; // negate if s == -1
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var r: u128 = undefined;
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_ = udivmod(u128, @bitCast(u128, an), @bitCast(u128, bn), &r);
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return (@bitCast(i128, r) ^ s_a) -% s_a; // negate if s == -1
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}
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test {
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_ = @import("modti3_test.zig");
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}
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