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Add i128 compiler-rt div/mul support

master
Marc Tiehuis 2018-06-13 22:25:04 +12:00
parent 86adc1ef39
commit 9110140514
6 changed files with 163 additions and 0 deletions
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2
CMakeLists.txt
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@ -556,6 +556,7 @@ set(ZIG_STD_FILES
"special/compiler_rt/aulldiv.zig"
"special/compiler_rt/aullrem.zig"
"special/compiler_rt/comparetf2.zig"
"special/compiler_rt/divti3.zig"
"special/compiler_rt/fixuint.zig"
"special/compiler_rt/fixunsdfdi.zig"
"special/compiler_rt/fixunsdfsi.zig"
@ -566,6 +567,7 @@ set(ZIG_STD_FILES
"special/compiler_rt/fixunstfdi.zig"
"special/compiler_rt/fixunstfsi.zig"
"special/compiler_rt/fixunstfti.zig"
"special/compiler_rt/muloti4.zig"
"special/compiler_rt/index.zig"
"special/compiler_rt/udivmod.zig"
"special/compiler_rt/udivmoddi4.zig"

16
std/special/compiler_rt/divti3.zig Normal file
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@ -0,0 +1,16 @@
const udivmod = @import("udivmod.zig").udivmod;
const builtin = @import("builtin");
pub extern fn __divti3(a: i128, b: i128) i128 {
@setRuntimeSafety(builtin.is_test);
const s_a = a >> (i128.bit_count - 1);
const s_b = b >> (i128.bit_count - 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 (i128(r) ^ s) -% s;
}

21
std/special/compiler_rt/divti3_test.zig Normal file
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@ -0,0 +1,21 @@
const __divti3 = @import("divti3.zig").__divti3;
const assert = @import("std").debug.assert;
fn test__divti3(a: i128, b: i128, expected: i128) void {
const x = __divti3(a, b);
assert(x == expected);
}
test "divti3" {
test__divti3(0, 1, 0);
test__divti3(0, -1, 0);
test__divti3(2, 1, 2);
test__divti3(2, -1, -2);
test__divti3(-2, 1, -2);
test__divti3(-2, -1, 2);
test__divti3(@bitCast(i128, u128(0x8 << 124)), 1, @bitCast(i128, u128(0x8 << 124)));
test__divti3(@bitCast(i128, u128(0x8 << 124)), -1, @bitCast(i128, u128(0x8 << 124)));
test__divti3(@bitCast(i128, u128(0x8 << 124)), -2, @bitCast(i128, u128(0x4 << 124)));
test__divti3(@bitCast(i128, u128(0x8 << 124)), 2, @bitCast(i128, u128(0xc << 124)));
}

3
std/special/compiler_rt/index.zig
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@ -38,6 +38,9 @@ comptime {
@export("__umoddi3", __umoddi3, linkage);
@export("__udivmodsi4", __udivmodsi4, linkage);
@export("__divti3", @import("divti3.zig").__divti3, linkage);
@export("__muloti4", @import("muloti4.zig").__muloti4, linkage);
if (isArmArch()) {
@export("__aeabi_uldivmod", __aeabi_uldivmod, linkage);
@export("__aeabi_uidivmod", __aeabi_uidivmod, linkage);

45
std/special/compiler_rt/muloti4.zig Normal file
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@ -0,0 +1,45 @@
const udivmod = @import("udivmod.zig").udivmod;
const builtin = @import("builtin");
pub extern fn __muloti4(a: i128, b: i128, overflow: *c_int) i128 {
@setRuntimeSafety(builtin.is_test);
const min = @bitCast(i128, u128(1 << (i128.bit_count - 1)));
const max = ~min;
overflow.* = 0;
const r = a *% b;
if (a == min) {
if (b != 0 and b != 1) {
overflow.* = 1;
}
return r;
}
if (b == min) {
if (a != 0 and a != 1) {
overflow.* = 1;
}
return r;
}
const sa = a >> (i128.bit_count - 1);
const abs_a = (a ^ sa) -% sa;
const sb = b >> (i128.bit_count - 1);
const abs_b = (b ^ sb) -% sb;
if (abs_a < 2 or abs_b < 2) {
return r;
}
if (sa == sb) {
if (abs_a > @divFloor(max, abs_b)) {
overflow.* = 1;
}
} else {
if (abs_a > @divFloor(min, -abs_b)) {
overflow.* = 1;
}
}
return r;
}

76
std/special/compiler_rt/muloti4_test.zig Normal file
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@ -0,0 +1,76 @@
const __muloti4 = @import("muloti4.zig").__muloti4;
const assert = @import("std").debug.assert;
fn test__muloti4(a: i128, b: i128, expected: i128, expected_overflow: c_int) void {
var overflow: c_int = undefined;
const x = __muloti4(a, b, &overflow);
assert(overflow == expected_overflow and (overflow != 0 or x == expected));
}
test "muloti4" {
test__muloti4(0, 0, 0, 0);
test__muloti4(0, 1, 0, 0);
test__muloti4(1, 0, 0, 0);
test__muloti4(0, 10, 0, 0);
test__muloti4(10, 0, 0, 0);
test__muloti4(0, 81985529216486895, 0, 0);
test__muloti4(81985529216486895, 0, 0, 0);
test__muloti4(0, -1, 0, 0);
test__muloti4(-1, 0, 0, 0);
test__muloti4(0, -10, 0, 0);
test__muloti4(-10, 0, 0, 0);
test__muloti4(0, -81985529216486895, 0, 0);
test__muloti4(-81985529216486895, 0, 0, 0);
test__muloti4(3037000499, 3037000499, 9223372030926249001, 0);
test__muloti4(-3037000499, 3037000499, -9223372030926249001, 0);
test__muloti4(3037000499, -3037000499, -9223372030926249001, 0);
test__muloti4(-3037000499, -3037000499, 9223372030926249001, 0);
test__muloti4(4398046511103, 2097152, 9223372036852678656, 0);
test__muloti4(-4398046511103, 2097152, -9223372036852678656, 0);
test__muloti4(4398046511103, -2097152, -9223372036852678656, 0);
test__muloti4(-4398046511103, -2097152, 9223372036852678656, 0);
test__muloti4(2097152, 4398046511103, 9223372036852678656, 0);
test__muloti4(-2097152, 4398046511103, -9223372036852678656, 0);
test__muloti4(2097152, -4398046511103, -9223372036852678656, 0);
test__muloti4(-2097152, -4398046511103, 9223372036852678656, 0);
test__muloti4(@bitCast(i128, u128(0x00000000000000B504F333F9DE5BE000)), @bitCast(i128, u128(0x000000000000000000B504F333F9DE5B)), @bitCast(i128, u128(0x7FFFFFFFFFFFF328DF915DA296E8A000)), 0);
test__muloti4(@bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), -2, @bitCast(i128, u128(0x80000000000000000000000000000001)), 1);
test__muloti4(-2, @bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), @bitCast(i128, u128(0x80000000000000000000000000000001)), 1);
test__muloti4(@bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), -1, @bitCast(i128, u128(0x80000000000000000000000000000001)), 0);
test__muloti4(-1, @bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), @bitCast(i128, u128(0x80000000000000000000000000000001)), 0);
test__muloti4(@bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), 0, 0, 0);
test__muloti4(0, @bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), 0, 0);
test__muloti4(@bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), 1, @bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), 0);
test__muloti4(1, @bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), @bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), 0);
test__muloti4(@bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), 2, @bitCast(i128, u128(0x80000000000000000000000000000001)), 1);
test__muloti4(2, @bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), @bitCast(i128, u128(0x80000000000000000000000000000001)), 1);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000000)), -2, @bitCast(i128, u128(0x80000000000000000000000000000000)), 1);
test__muloti4(-2, @bitCast(i128, u128(0x80000000000000000000000000000000)), @bitCast(i128, u128(0x80000000000000000000000000000000)), 1);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000000)), -1, @bitCast(i128, u128(0x80000000000000000000000000000000)), 1);
test__muloti4(-1, @bitCast(i128, u128(0x80000000000000000000000000000000)), @bitCast(i128, u128(0x80000000000000000000000000000000)), 1);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000000)), 0, 0, 0);
test__muloti4(0, @bitCast(i128, u128(0x80000000000000000000000000000000)), 0, 0);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000000)), 1, @bitCast(i128, u128(0x80000000000000000000000000000000)), 0);
test__muloti4(1, @bitCast(i128, u128(0x80000000000000000000000000000000)), @bitCast(i128, u128(0x80000000000000000000000000000000)), 0);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000000)), 2, @bitCast(i128, u128(0x80000000000000000000000000000000)), 1);
test__muloti4(2, @bitCast(i128, u128(0x80000000000000000000000000000000)), @bitCast(i128, u128(0x80000000000000000000000000000000)), 1);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000001)), -2, @bitCast(i128, u128(0x80000000000000000000000000000001)), 1);
test__muloti4(-2, @bitCast(i128, u128(0x80000000000000000000000000000001)), @bitCast(i128, u128(0x80000000000000000000000000000001)), 1);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000001)), -1, @bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), 0);
test__muloti4(-1, @bitCast(i128, u128(0x80000000000000000000000000000001)), @bitCast(i128, u128(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)), 0);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000001)), 0, 0, 0);
test__muloti4(0, @bitCast(i128, u128(0x80000000000000000000000000000001)), 0, 0);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000001)), 1, @bitCast(i128, u128(0x80000000000000000000000000000001)), 0);
test__muloti4(1, @bitCast(i128, u128(0x80000000000000000000000000000001)), @bitCast(i128, u128(0x80000000000000000000000000000001)), 0);
test__muloti4(@bitCast(i128, u128(0x80000000000000000000000000000001)), 2, @bitCast(i128, u128(0x80000000000000000000000000000000)), 1);
test__muloti4(2, @bitCast(i128, u128(0x80000000000000000000000000000001)), @bitCast(i128, u128(0x80000000000000000000000000000000)), 1);
}