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compiler-rt: Port __mulsi3 builtin

master
LemonBoy 2020-01-22 16:07:51 +01:00 committed by Andrew Kelley
parent c522699f28
commit 69c72e24d4
2 changed files with 61 additions and 0 deletions
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1
lib/std/special/compiler_rt.zig
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@ -130,6 +130,7 @@ comptime {
@export(@import("compiler_rt/int.zig").__udivmoddi4, .{ .name = "__udivmoddi4", .linkage = linkage });
@export(@import("compiler_rt/popcountdi2.zig").__popcountdi2, .{ .name = "__popcountdi2", .linkage = linkage });
@export(@import("compiler_rt/int.zig").__mulsi3, .{ .name = "__mulsi3", .linkage = linkage });
@export(@import("compiler_rt/muldi3.zig").__muldi3, .{ .name = "__muldi3", .linkage = linkage });
@export(@import("compiler_rt/int.zig").__divmoddi4, .{ .name = "__divmoddi4", .linkage = linkage });
@export(@import("compiler_rt/int.zig").__divsi3, .{ .name = "__divsi3", .linkage = linkage });

60
lib/std/special/compiler_rt/int.zig
View File

@ -1,6 +1,8 @@
// Builtin functions that operate on integer types
const builtin = @import("builtin");
const testing = @import("std").testing;
const maxInt = @import("std").math.maxInt;
const minInt = @import("std").math.maxInt;
const udivmod = @import("udivmod.zig").udivmod;
@ -578,3 +580,61 @@ fn test_one_umodsi3(a: u32, b: u32, expected_r: u32) void {
const r: u32 = __umodsi3(a, b);
testing.expect(r == expected_r);
}
pub fn __mulsi3(a: i32, b: i32) callconv(.C) i32 {
@setRuntimeSafety(builtin.is_test);
var ua = @bitCast(u32, a);
var ub = @bitCast(u32, b);
var r: u32 = 0;
while (ua > 0) {
if ((ua & 1) != 0) r +%= ub;
ua >>= 1;
ub <<= 1;
}
return @bitCast(i32, r);
}
fn test_one_mulsi3(a: i32, b: i32, result: i32) void {
testing.expectEqual(result, __mulsi3(a, b));
}
test "mulsi3" {
test_one_mulsi3(0, 0, 0);
test_one_mulsi3(0, 1, 0);
test_one_mulsi3(1, 0, 0);
test_one_mulsi3(0, 10, 0);
test_one_mulsi3(10, 0, 0);
test_one_mulsi3(0, maxInt(i32), 0);
test_one_mulsi3(maxInt(i32), 0, 0);
test_one_mulsi3(0, -1, 0);
test_one_mulsi3(-1, 0, 0);
test_one_mulsi3(0, -10, 0);
test_one_mulsi3(-10, 0, 0);
test_one_mulsi3(0, minInt(i32), 0);
test_one_mulsi3(minInt(i32), 0, 0);
test_one_mulsi3(1, 1, 1);
test_one_mulsi3(1, 10, 10);
test_one_mulsi3(10, 1, 10);
test_one_mulsi3(1, maxInt(i32), maxInt(i32));
test_one_mulsi3(maxInt(i32), 1, maxInt(i32));
test_one_mulsi3(1, -1, -1);
test_one_mulsi3(1, -10, -10);
test_one_mulsi3(-10, 1, -10);
test_one_mulsi3(1, minInt(i32), minInt(i32));
test_one_mulsi3(minInt(i32), 1, minInt(i32));
test_one_mulsi3(46340, 46340, 2147395600);
test_one_mulsi3(-46340, 46340, -2147395600);
test_one_mulsi3(46340, -46340, -2147395600);
test_one_mulsi3(-46340, -46340, 2147395600);
test_one_mulsi3(4194303, 8192, @truncate(i32, 34359730176));
test_one_mulsi3(-4194303, 8192, @truncate(i32, -34359730176));
test_one_mulsi3(4194303, -8192, @truncate(i32, -34359730176));
test_one_mulsi3(-4194303, -8192, @truncate(i32, 34359730176));
test_one_mulsi3(8192, 4194303, @truncate(i32, 34359730176));
test_one_mulsi3(-8192, 4194303, @truncate(i32, -34359730176));
test_one_mulsi3(8192, -4194303, @truncate(i32, -34359730176));
test_one_mulsi3(-8192, -4194303, @truncate(i32, 34359730176));
}