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ec95e00e28
stage2: change logic for detecting whether the main package is inside
the std package. Previously it relied on realpath() which is not portable.
This uses resolve() which is how imports already work.
* stage2: fix cleanup bug when creating Module
* flatten lib/std/special/* to lib/*
- this was motivated by making main_pkg_is_inside_std false for
compiler_rt & friends.
* rename "mini libc" to "universal libc"
65 lines
1.9 KiB
Zig
65 lines
1.9 KiB
Zig
const compiler_rt = @import("../compiler_rt.zig");
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const std = @import("std");
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const builtin = @import("builtin");
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const is_test = builtin.is_test;
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const native_endian = builtin.cpu.arch.endian();
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// Ported from git@github.com:llvm-project/llvm-project-20170507.git
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// ae684fad6d34858c014c94da69c15e7774a633c3
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// 2018-08-13
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pub fn __multi3(a: i128, b: i128) callconv(.C) i128 {
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@setRuntimeSafety(is_test);
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const x = twords{ .all = a };
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const y = twords{ .all = b };
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var r = twords{ .all = __mulddi3(x.s.low, y.s.low) };
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r.s.high +%= x.s.high *% y.s.low +% x.s.low *% y.s.high;
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return r.all;
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}
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const v128 = @Vector(2, u64);
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pub fn __multi3_windows_x86_64(a: v128, b: v128) callconv(.C) v128 {
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return @bitCast(v128, @call(.{ .modifier = .always_inline }, __multi3, .{
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@bitCast(i128, a),
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@bitCast(i128, b),
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}));
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}
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fn __mulddi3(a: u64, b: u64) i128 {
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const bits_in_dword_2 = (@sizeOf(i64) * 8) / 2;
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const lower_mask = ~@as(u64, 0) >> bits_in_dword_2;
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var r: twords = undefined;
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r.s.low = (a & lower_mask) *% (b & lower_mask);
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var t: u64 = r.s.low >> bits_in_dword_2;
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r.s.low &= lower_mask;
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t +%= (a >> bits_in_dword_2) *% (b & lower_mask);
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r.s.low +%= (t & lower_mask) << bits_in_dword_2;
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r.s.high = t >> bits_in_dword_2;
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t = r.s.low >> bits_in_dword_2;
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r.s.low &= lower_mask;
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t +%= (b >> bits_in_dword_2) *% (a & lower_mask);
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r.s.low +%= (t & lower_mask) << bits_in_dword_2;
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r.s.high +%= t >> bits_in_dword_2;
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r.s.high +%= (a >> bits_in_dword_2) *% (b >> bits_in_dword_2);
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return r.all;
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}
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const twords = extern union {
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all: i128,
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s: S,
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const S = if (native_endian == .Little)
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struct {
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low: u64,
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high: u64,
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}
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else
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struct {
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high: u64,
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low: u64,
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};
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};
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test {
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_ = @import("multi3_test.zig");
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}
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