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compiler-rt: add __muldi3

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This commit is contained in:
Andrew Kelley 2019-07-18 13:54:22 -04:00
parent bc31c1280e
commit 16be70cbbf
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GPG Key ID: 7C5F548F728501A9
6 changed files with 116 additions and 5 deletions
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9
build.zig
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@ -122,16 +122,19 @@ pub fn build(b: *Builder) !void {
}
const modes = chosen_modes[0..chosen_mode_index];
const multi_and_single = [_]bool{ false, true };
const just_multi = [_]bool{false};
// run stage1 `zig fmt` on this build.zig file just to make sure it works
test_step.dependOn(&fmt_build_zig.step);
const fmt_step = b.step("test-fmt", "Run zig fmt against build.zig to make sure it works");
fmt_step.dependOn(&fmt_build_zig.step);
test_step.dependOn(tests.addPkgTests(b, test_filter, "test/stage1/behavior.zig", "behavior", "Run the behavior tests", modes, skip_non_native));
test_step.dependOn(tests.addPkgTests(b, test_filter, "test/stage1/behavior.zig", "behavior", "Run the behavior tests", modes, multi_and_single, skip_non_native));
test_step.dependOn(tests.addPkgTests(b, test_filter, "std/std.zig", "std", "Run the standard library tests", modes, skip_non_native));
test_step.dependOn(tests.addPkgTests(b, test_filter, "std/std.zig", "std", "Run the standard library tests", modes, multi_and_single, skip_non_native));
test_step.dependOn(tests.addPkgTests(b, test_filter, "std/special/compiler_rt.zig", "compiler-rt", "Run the compiler_rt tests", modes, skip_non_native));
test_step.dependOn(tests.addPkgTests(b, test_filter, "std/special/compiler_rt.zig", "compiler-rt", "Run the compiler_rt tests", modes, just_multi, skip_non_native));
test_step.dependOn(tests.addCompareOutputTests(b, test_filter, modes));
test_step.dependOn(tests.addStandaloneTests(b, test_filter, modes));

3
std/special/compiler_rt.zig
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@ -127,6 +127,7 @@ comptime {
@export("__udivmoddi4", @import("compiler_rt/udivmoddi4.zig").__udivmoddi4, linkage);
@export("__popcountdi2", @import("compiler_rt/popcountdi2.zig").__popcountdi2, linkage);
@export("__muldi3", @import("compiler_rt/muldi3.zig").__muldi3, linkage);
@export("__divmoddi4", __divmoddi4, linkage);
@export("__divsi3", __divsi3, linkage);
@export("__divdi3", __divdi3, linkage);
@ -147,6 +148,8 @@ comptime {
@export("__aeabi_unwind_cpp_pr1", __aeabi_unwind_cpp_pr1, linkage);
@export("__aeabi_unwind_cpp_pr2", __aeabi_unwind_cpp_pr2, linkage);
@export("__aeabi_lmul", @import("compiler_rt/muldi3.zig").__muldi3, linkage);
@export("__aeabi_ldivmod", __aeabi_ldivmod, linkage);
@export("__aeabi_uldivmod", __aeabi_uldivmod, linkage);

1
std/special/compiler_rt/divti3.zig
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@ -1,6 +1,5 @@
const udivmod = @import("udivmod.zig").udivmod;
const builtin = @import("builtin");
const compiler_rt = @import("../compiler_rt.zig");
pub extern fn __divti3(a: i128, b: i128) i128 {
@setRuntimeSafety(builtin.is_test);

54
std/special/compiler_rt/muldi3.zig Normal file
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@ -0,0 +1,54 @@
const builtin = @import("builtin");
// Ported from
// https://github.com/llvm/llvm-project/blob/552c2c09d354a3ad9c1c9647e0a3bb5099c31088/compiler-rt/lib/builtins/muldi3.c
const dwords = extern union {
all: i64,
s: switch (builtin.endian) {
.Little => extern struct {
low: u32,
high: u32,
},
.Big => extern struct {
high: u32,
low: u32,
},
},
};
fn __muldsi3(a: u32, b: u32) i64 {
@setRuntimeSafety(builtin.is_test);
const bits_in_word_2 = @sizeOf(i32) * 8 / 2;
const lower_mask = (~u32(0)) >> bits_in_word_2;
var r: dwords = undefined;
r.s.low = (a & lower_mask) *% (b & lower_mask);
var t: u32 = r.s.low >> bits_in_word_2;
r.s.low &= lower_mask;
t += (a >> bits_in_word_2) *% (b & lower_mask);
r.s.low +%= (t & lower_mask) << bits_in_word_2;
r.s.high = t >> bits_in_word_2;
t = r.s.low >> bits_in_word_2;
r.s.low &= lower_mask;
t +%= (b >> bits_in_word_2) *% (a & lower_mask);
r.s.low +%= (t & lower_mask) << bits_in_word_2;
r.s.high +%= t >> bits_in_word_2;
r.s.high +%= (a >> bits_in_word_2) *% (b >> bits_in_word_2);
return r.all;
}
pub extern fn __muldi3(a: i64, b: i64) i64 {
@setRuntimeSafety(builtin.is_test);
const x = dwords{ .all = a };
const y = dwords{ .all = b };
var r = dwords{ .all = __muldsi3(x.s.low, y.s.low) };
r.s.high +%= x.s.high *% y.s.low +% x.s.low *% y.s.high;
return r.all;
}
test "import muldi3" {
_ = @import("muldi3_test.zig");
}

51
std/special/compiler_rt/muldi3_test.zig Normal file
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@ -0,0 +1,51 @@
const __muldi3 = @import("muldi3.zig").__muldi3;
const testing = @import("std").testing;
fn test__muldi3(a: i64, b: i64, expected: i64) void {
const x = __muldi3(a, b);
testing.expect(x == expected);
}
test "muldi3" {
test__muldi3(0, 0, 0);
test__muldi3(0, 1, 0);
test__muldi3(1, 0, 0);
test__muldi3(0, 10, 0);
test__muldi3(10, 0, 0);
test__muldi3(0, 81985529216486895, 0);
test__muldi3(81985529216486895, 0, 0);
test__muldi3(0, -1, 0);
test__muldi3(-1, 0, 0);
test__muldi3(0, -10, 0);
test__muldi3(-10, 0, 0);
test__muldi3(0, -81985529216486895, 0);
test__muldi3(-81985529216486895, 0, 0);
test__muldi3(1, 1, 1);
test__muldi3(1, 10, 10);
test__muldi3(10, 1, 10);
test__muldi3(1, 81985529216486895, 81985529216486895);
test__muldi3(81985529216486895, 1, 81985529216486895);
test__muldi3(1, -1, -1);
test__muldi3(1, -10, -10);
test__muldi3(-10, 1, -10);
test__muldi3(1, -81985529216486895, -81985529216486895);
test__muldi3(-81985529216486895, 1, -81985529216486895);
test__muldi3(3037000499, 3037000499, 9223372030926249001);
test__muldi3(-3037000499, 3037000499, -9223372030926249001);
test__muldi3(3037000499, -3037000499, -9223372030926249001);
test__muldi3(-3037000499, -3037000499, 9223372030926249001);
test__muldi3(4398046511103, 2097152, 9223372036852678656);
test__muldi3(-4398046511103, 2097152, -9223372036852678656);
test__muldi3(4398046511103, -2097152, -9223372036852678656);
test__muldi3(-4398046511103, -2097152, 9223372036852678656);
test__muldi3(2097152, 4398046511103, 9223372036852678656);
test__muldi3(-2097152, 4398046511103, -9223372036852678656);
test__muldi3(2097152, -4398046511103, -9223372036852678656);
test__muldi3(-2097152, -4398046511103, 9223372036852678656);
}

3
test/tests.zig
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@ -170,6 +170,7 @@ pub fn addPkgTests(
name: []const u8,
desc: []const u8,
modes: []const Mode,
single_threaded_list: []const bool,
skip_non_native: bool,
) *build.Step {
const step = b.step(b.fmt("test-{}", name), desc);
@ -179,7 +180,7 @@ pub fn addPkgTests(
continue;
for (modes) |mode| {
for ([_]bool{ false, true }) |link_libc| {
for ([_]bool{ false, true }) |single_threaded| {
for (single_threaded_list) |single_threaded| {
if (link_libc and !is_native) {
// don't assume we have a cross-compiling libc set up
continue;