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Implements std.math.sign for float vectors.

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IntegratedQuantum 2022-11-11 15:26:26 +01:00 committed by Veikka Tuominen
parent 7733246d6e
commit fbc4331f18
1 changed files with 11 additions and 16 deletions
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27
lib/std/math.zig
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@ -1596,9 +1596,8 @@ pub fn break_f80(x: f80) F80 {
}
/// Returns -1, 0, or 1.
/// Supports integer types, vectors of integer types, and float types.
/// Supports integer and float types and vectors of integer and float types.
/// Unsigned integer types will always return 0 or 1.
/// TODO: support vectors of floats
/// Branchless.
pub inline fn sign(i: anytype) @TypeOf(i) {
const T = @TypeOf(i);
@ -1606,15 +1605,14 @@ pub inline fn sign(i: anytype) @TypeOf(i) {
.Int, .ComptimeInt => @as(T, @boolToInt(i > 0)) - @boolToInt(i < 0),
.Float, .ComptimeFloat => @intToFloat(T, @boolToInt(i > 0)) - @intToFloat(T, @boolToInt(i < 0)),
.Vector => |vinfo| blk: {
const u1xN = std.meta.Vector(vinfo.len, u1);
break :blk switch (@typeInfo(vinfo.child)) {
.Int => @as(T, @bitCast(u1xN, i > @splat(vinfo.len, @as(vinfo.child, 0)))) -
@as(T, @bitCast(u1xN, i < @splat(vinfo.len, @as(vinfo.child, 0)))),
.Float => @compileError("TODO: add support for vectors of floats once @intToFloat accepts vector types"),
// break :blk @intToFloat(T, @bitCast(u1xN, i > @splat(vinfo.len, @as(vinfo.child, 0)))) -
// @intToFloat(T, @bitCast(u1xN, i < @splat(vinfo.len, @as(vinfo.child, 0)))),
switch (@typeInfo(vinfo.child)) {
.Int, .Float => {
const zero = @splat(vinfo.len, @as(vinfo.child, 0));
const one = @splat(vinfo.len, @as(vinfo.child, 1));
break :blk @select(vinfo.child, i > zero, one, zero) - @select(vinfo.child, i < zero, one, zero);
},
else => @compileError("Expected vector of ints or floats, found " ++ @typeName(T)),
};
}
},
else => @compileError("Expected an int, float or vector of one, found " ++ @typeName(T)),
};
@ -1669,24 +1667,21 @@ fn testSign() !void {
try std.testing.expectEqual(@as(T, 1), sign(@as(T, 2)));
try std.testing.expectEqual(@as(T, -1), sign(@as(T, -2)));
try std.testing.expectEqual(@as(T, 0), sign(@as(T, 0)));
// TODO - uncomment once @intToFloat supports vectors
// try std.testing.expectEqual(@Vector(3, T){ 1, -1, 0 }, sign(@Vector(3, T){ 2, -2, 0 }));
try std.testing.expectEqual(@Vector(3, T){ 1, -1, 0 }, sign(@Vector(3, T){ 2, -2, 0 }));
}
{
const T = f32;
try std.testing.expectEqual(@as(T, 1), sign(@as(T, 2)));
try std.testing.expectEqual(@as(T, -1), sign(@as(T, -2)));
try std.testing.expectEqual(@as(T, 0), sign(@as(T, 0)));
// TODO - uncomment once @intToFloat supports vectors
// try std.testing.expectEqual(@Vector(3, T){ 1, -1, 0 }, sign(@Vector(3, T){ 2, -2, 0 }));
try std.testing.expectEqual(@Vector(3, T){ 1, -1, 0 }, sign(@Vector(3, T){ 2, -2, 0 }));
}
{
const T = f64;
try std.testing.expectEqual(@as(T, 1), sign(@as(T, 2)));
try std.testing.expectEqual(@as(T, -1), sign(@as(T, -2)));
try std.testing.expectEqual(@as(T, 0), sign(@as(T, 0)));
// TODO - uncomment once @intToFloat supports vectors
// try std.testing.expectEqual(@Vector(3, T){ 1, -1, 0 }, sign(@Vector(3, T){ 2, -2, 0 }));
try std.testing.expectEqual(@Vector(3, T){ 1, -1, 0 }, sign(@Vector(3, T){ 2, -2, 0 }));
}
// comptime_int