mirror of
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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"
58 lines
1.6 KiB
Zig
58 lines
1.6 KiB
Zig
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
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// https://github.com/llvm/llvm-project/blob/llvmorg-9.0.0/compiler-rt/lib/builtins/muldi3.c
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const dwords = extern union {
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all: i64,
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s: switch (native_endian) {
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.Little => extern struct {
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low: u32,
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high: u32,
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},
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.Big => extern struct {
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high: u32,
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low: u32,
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},
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},
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};
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fn __muldsi3(a: u32, b: u32) i64 {
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@setRuntimeSafety(is_test);
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const bits_in_word_2 = @sizeOf(i32) * 8 / 2;
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const lower_mask = (~@as(u32, 0)) >> bits_in_word_2;
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var r: dwords = undefined;
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r.s.low = (a & lower_mask) *% (b & lower_mask);
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var t: u32 = r.s.low >> bits_in_word_2;
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r.s.low &= lower_mask;
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t += (a >> bits_in_word_2) *% (b & lower_mask);
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r.s.low +%= (t & lower_mask) << bits_in_word_2;
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r.s.high = t >> bits_in_word_2;
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t = r.s.low >> bits_in_word_2;
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r.s.low &= lower_mask;
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t +%= (b >> bits_in_word_2) *% (a & lower_mask);
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r.s.low +%= (t & lower_mask) << bits_in_word_2;
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r.s.high +%= t >> bits_in_word_2;
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r.s.high +%= (a >> bits_in_word_2) *% (b >> bits_in_word_2);
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return r.all;
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}
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pub fn __muldi3(a: i64, b: i64) callconv(.C) i64 {
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@setRuntimeSafety(is_test);
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const x = dwords{ .all = a };
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const y = dwords{ .all = b };
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var r = dwords{ .all = __muldsi3(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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test {
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_ = @import("muldi3_test.zig");
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}
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