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chore: change implementation of rotr

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-04-08 02:13:41 -03:00
parent aac01b0bfe
commit 11a034658a
1 changed files with 5 additions and 4 deletions
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9
src/util.zig
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@ -9,11 +9,12 @@ pub inline fn sext(comptime bits: comptime_int, value: u32) u32 {
}
/// See https://godbolt.org/z/W3en9Eche
pub inline fn rotr(comptime T: type, value: T, r: anytype) T {
comptime std.debug.assert(@typeInfo(T).Int.signedness == .unsigned);
const ar = @truncate(Log2Int(T), r);
pub inline fn rotr(comptime T: type, x: T, r: anytype) T {
if (@typeInfo(T).Int.signedness == .signed)
@compileError("cannot rotate signed integer");
return value >> ar | value << @truncate(Log2Int(T), @typeInfo(T).Int.bits - @as(T, ar));
const ar = @intCast(Log2Int(T), @mod(r, @typeInfo(T).Int.bits));
return x >> ar | x << (1 +% ~ar);
}
pub const FpsAverage = struct {