50a29f7c21
@select(
comptime T: type,
pred: std.meta.Vector(len, bool),
a: std.meta.Vector(len, T),
b: std.meta.Vector(len, T)
) std.meta.Vector(len, T)
Constructs a vector from a & b, based on the values in the predicate vector. For indices where the predicate value is true, the corresponding
element from the a vector is selected, and otherwise from b.
26 lines
998 B
Zig
26 lines
998 B
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const mem = std.mem;
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const expect = std.testing.expect;
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const Vector = std.meta.Vector;
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test "@select" {
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const S = struct {
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fn doTheTest() !void {
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var a: Vector(4, bool) = [4]bool{ true, false, true, false };
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var b: Vector(4, i32) = [4]i32{ -1, 4, 999, -31 };
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var c: Vector(4, i32) = [4]i32{ -5, 1, 0, 1234 };
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var abc = @select(i32, a, b, c);
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try expect(mem.eql(i32, &@as([4]i32, abc), &[4]i32{ -1, 1, 999, 1234 }));
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var x: Vector(4, bool) = [4]bool{ false, false, false, true };
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var y: Vector(4, f32) = [4]f32{ 0.001, 33.4, 836, -3381.233 };
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var z: Vector(4, f32) = [4]f32{ 0.0, 312.1, -145.9, 9993.55 };
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var xyz = @select(f32, x, y, z);
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try expect(mem.eql(f32, &@as([4]f32, xyz), &[4]f32{ 0.0, 312.1, -145.9, -3381.233 }));
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}
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};
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try S.doTheTest();
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comptime try S.doTheTest();
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}
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