0556a2ba53
Finishes cleanups that I started in other commits in this branch. * Use common.linkage for all exports instead of redoing the logic in each file. * Remove pointless `@setRuntimeSafety` calls. * Avoid redundantly exporting multiple versions of functions. For example, if PPC wants `ceilf128` then don't also export `ceilq`; similarly if ARM wants `__aeabi_ddiv` then don't also export `__divdf3`. * Use `inline` for helper functions instead of making inline calls at callsites.
55 lines
1.6 KiB
Zig
55 lines
1.6 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 (builtin.os.tag == .windows) {
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switch (arch) {
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.i386 => {
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@export(__divti3, .{ .name = "__divti3", .linkage = common.linkage });
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},
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.x86_64 => {
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// The "ti" functions must use Vector(2, u64) parameter types to adhere to the ABI
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// that LLVM expects compiler-rt to have.
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@export(__divti3_windows_x86_64, .{ .name = "__divti3", .linkage = common.linkage });
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},
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else => {},
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}
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if (arch.isAARCH64()) {
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@export(__divti3, .{ .name = "__divti3", .linkage = common.linkage });
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}
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} else {
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@export(__divti3, .{ .name = "__divti3", .linkage = common.linkage });
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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 = @import("std").meta.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(v128, div(@bitCast(i128, a), @bitCast(i128, 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(u128, an), @bitCast(u128, bn), null);
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const s = s_a ^ s_b;
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return (@bitCast(i128, 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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