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const std = @import("std");
const builtin = @import("builtin");
const udivmod = @import("udivmod.zig").udivmod;
const arch = builtin.cpu.arch;
const common = @import("common.zig");
pub const panic = common.panic;
comptime {
if (builtin.os.tag == .windows) {
switch (arch) {
.i386 => {
@export(__divti3, .{ .name = "__divti3", .linkage = common.linkage });
},
.x86_64 => {
// The "ti" functions must use Vector(2, u64) parameter types to adhere to the ABI
// that LLVM expects compiler-rt to have.
@export(__divti3_windows_x86_64, .{ .name = "__divti3", .linkage = common.linkage });
},
else => {},
}
if (arch.isAARCH64()) {
@export(__divti3, .{ .name = "__divti3", .linkage = common.linkage });
}
} else {
@export(__divti3, .{ .name = "__divti3", .linkage = common.linkage });
}
}
pub fn __divti3(a: i128, b: i128) callconv(.C) i128 {
return div(a, b);
}
const v128 = @import("std").meta.Vector(2, u64);
fn __divti3_windows_x86_64(a: v128, b: v128) callconv(.C) v128 {
return @bitCast(v128, div(@bitCast(i128, a), @bitCast(i128, b)));
}
inline fn div(a: i128, b: i128) i128 {
const s_a = a >> (128 - 1);
const s_b = b >> (128 - 1);
const an = (a ^ s_a) -% s_a;
const bn = (b ^ s_b) -% s_b;
const r = udivmod(u128, @bitCast(u128, an), @bitCast(u128, bn), null);
const s = s_a ^ s_b;
return (@bitCast(i128, r) ^ s) -% s;
}
test {
_ = @import("divti3_test.zig");
}
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