blob 14a7d1cd (3626B) - Raw
1 const std = @import("std"); 2 const expect = std.testing.expect; 3 const minInt = std.math.minInt; 4 5 test "@bitReverse" { 6 comptime try testBitReverse(); 7 try testBitReverse(); 8 } 9 10 fn testBitReverse() !void { 11 // using comptime_ints, unsigned 12 try expect(@bitReverse(u0, 0) == 0); 13 try expect(@bitReverse(u5, 0x12) == 0x9); 14 try expect(@bitReverse(u8, 0x12) == 0x48); 15 try expect(@bitReverse(u16, 0x1234) == 0x2c48); 16 try expect(@bitReverse(u24, 0x123456) == 0x6a2c48); 17 try expect(@bitReverse(u32, 0x12345678) == 0x1e6a2c48); 18 try expect(@bitReverse(u40, 0x123456789a) == 0x591e6a2c48); 19 try expect(@bitReverse(u48, 0x123456789abc) == 0x3d591e6a2c48); 20 try expect(@bitReverse(u56, 0x123456789abcde) == 0x7b3d591e6a2c48); 21 try expect(@bitReverse(u64, 0x123456789abcdef1) == 0x8f7b3d591e6a2c48); 22 try expect(@bitReverse(u128, 0x123456789abcdef11121314151617181) == 0x818e868a828c84888f7b3d591e6a2c48); 23 24 // using runtime uints, unsigned 25 var num0: u0 = 0; 26 try expect(@bitReverse(u0, num0) == 0); 27 var num5: u5 = 0x12; 28 try expect(@bitReverse(u5, num5) == 0x9); 29 var num8: u8 = 0x12; 30 try expect(@bitReverse(u8, num8) == 0x48); 31 var num16: u16 = 0x1234; 32 try expect(@bitReverse(u16, num16) == 0x2c48); 33 var num24: u24 = 0x123456; 34 try expect(@bitReverse(u24, num24) == 0x6a2c48); 35 var num32: u32 = 0x12345678; 36 try expect(@bitReverse(u32, num32) == 0x1e6a2c48); 37 var num40: u40 = 0x123456789a; 38 try expect(@bitReverse(u40, num40) == 0x591e6a2c48); 39 var num48: u48 = 0x123456789abc; 40 try expect(@bitReverse(u48, num48) == 0x3d591e6a2c48); 41 var num56: u56 = 0x123456789abcde; 42 try expect(@bitReverse(u56, num56) == 0x7b3d591e6a2c48); 43 var num64: u64 = 0x123456789abcdef1; 44 try expect(@bitReverse(u64, num64) == 0x8f7b3d591e6a2c48); 45 var num128: u128 = 0x123456789abcdef11121314151617181; 46 try expect(@bitReverse(u128, num128) == 0x818e868a828c84888f7b3d591e6a2c48); 47 48 // using comptime_ints, signed, positive 49 try expect(@bitReverse(u8, @as(u8, 0)) == 0); 50 try expect(@bitReverse(i8, @bitCast(i8, @as(u8, 0x92))) == @bitCast(i8, @as(u8, 0x49))); 51 try expect(@bitReverse(i16, @bitCast(i16, @as(u16, 0x1234))) == @bitCast(i16, @as(u16, 0x2c48))); 52 try expect(@bitReverse(i24, @bitCast(i24, @as(u24, 0x123456))) == @bitCast(i24, @as(u24, 0x6a2c48))); 53 try expect(@bitReverse(i32, @bitCast(i32, @as(u32, 0x12345678))) == @bitCast(i32, @as(u32, 0x1e6a2c48))); 54 try expect(@bitReverse(i40, @bitCast(i40, @as(u40, 0x123456789a))) == @bitCast(i40, @as(u40, 0x591e6a2c48))); 55 try expect(@bitReverse(i48, @bitCast(i48, @as(u48, 0x123456789abc))) == @bitCast(i48, @as(u48, 0x3d591e6a2c48))); 56 try expect(@bitReverse(i56, @bitCast(i56, @as(u56, 0x123456789abcde))) == @bitCast(i56, @as(u56, 0x7b3d591e6a2c48))); 57 try expect(@bitReverse(i64, @bitCast(i64, @as(u64, 0x123456789abcdef1))) == @bitCast(i64, @as(u64, 0x8f7b3d591e6a2c48))); 58 try expect(@bitReverse(i128, @bitCast(i128, @as(u128, 0x123456789abcdef11121314151617181))) == @bitCast(i128, @as(u128, 0x818e868a828c84888f7b3d591e6a2c48))); 59 60 // using signed, negative. Compare to runtime ints returned from llvm. 61 var neg8: i8 = -18; 62 try expect(@bitReverse(i8, @as(i8, -18)) == @bitReverse(i8, neg8)); 63 var neg16: i16 = -32694; 64 try expect(@bitReverse(i16, @as(i16, -32694)) == @bitReverse(i16, neg16)); 65 var neg24: i24 = -6773785; 66 try expect(@bitReverse(i24, @as(i24, -6773785)) == @bitReverse(i24, neg24)); 67 var neg32: i32 = -16773785; 68 try expect(@bitReverse(i32, @as(i32, -16773785)) == @bitReverse(i32, neg32)); 69 }