diff options
Diffstat (limited to 'v_windows/v/old/vlib/math/bits/bits_test.v')
| -rw-r--r-- | v_windows/v/old/vlib/math/bits/bits_test.v | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/v_windows/v/old/vlib/math/bits/bits_test.v b/v_windows/v/old/vlib/math/bits/bits_test.v new file mode 100644 index 0000000..23a01b3 --- /dev/null +++ b/v_windows/v/old/vlib/math/bits/bits_test.v @@ -0,0 +1,288 @@ +// +// test suite for bits and bits math functions +// +module bits + +fn test_bits() { + mut i := 0 + mut i1 := u64(0) + + // + // --- LeadingZeros --- + // + + // 8 bit + i = 1 + for x in 0 .. 8 { + // C.printf("x:%02x lz: %d cmp: %d\n", i << x, leading_zeros_8(i << x), 7-x) + assert leading_zeros_8(byte(i << x)) == 7 - x + } + + // 16 bit + i = 1 + for x in 0 .. 16 { + // C.printf("x:%04x lz: %d cmp: %d\n", u16(i) << x, leading_zeros_16(u16(i) << x), 15-x) + assert leading_zeros_16(u16(i) << x) == 15 - x + } + + // 32 bit + i = 1 + for x in 0 .. 32 { + // C.printf("x:%08x lz: %d cmp: %d\n", u32(i) << x, leading_zeros_32(u32(i) << x), 31-x) + assert leading_zeros_32(u32(i) << x) == 31 - x + } + + // 64 bit + i = 1 + for x in 0 .. 64 { + // C.printf("x:%016llx lz: %llu cmp: %d\n", u64(i) << x, leading_zeros_64(u64(i) << x), 63-x) + assert leading_zeros_64(u64(i) << x) == 63 - x + } + + // + // --- ones_count --- + // + + // 8 bit + i = 0 + for x in 0 .. 9 { + // C.printf("x:%02x lz: %llu cmp: %d\n", byte(i), ones_count_8(byte(i)), x) + assert ones_count_8(byte(i)) == x + i = (i << 1) + 1 + } + + // 16 bit + i = 0 + for x in 0 .. 17 { + // C.printf("x:%04x lz: %llu cmp: %d\n", u16(i), ones_count_16(u16(i)), x) + assert ones_count_16(u16(i)) == x + i = (i << 1) + 1 + } + + // 32 bit + i = 0 + for x in 0 .. 33 { + // C.printf("x:%08x lz: %llu cmp: %d\n", u32(i), ones_count_32(u32(i)), x) + assert ones_count_32(u32(i)) == x + i = (i << 1) + 1 + } + + // 64 bit + i1 = 0 + for x in 0 .. 65 { + // C.printf("x:%016llx lz: %llu cmp: %d\n", u64(i1), ones_count_64(u64(i1)), x) + assert ones_count_64(i1) == x + i1 = (i1 << 1) + 1 + } + + // + // --- rotate_left/right --- + // + assert rotate_left_8(0x12, 4) == 0x21 + assert rotate_left_16(0x1234, 8) == 0x3412 + assert rotate_left_32(0x12345678, 16) == 0x56781234 + assert rotate_left_64(0x1234567887654321, 32) == 0x8765432112345678 + + // + // --- reverse --- + // + + // 8 bit + i = 0 + for _ in 0 .. 9 { + mut rv := byte(0) + mut bc := 0 + mut n := i + for bc < 8 { + rv = (rv << 1) | (byte(n) & 0x01) + bc++ + n = n >> 1 + } + // C.printf("x:%02x lz: %llu cmp: %d\n", byte(i), reverse_8(byte(i)), rv) + assert reverse_8(byte(i)) == rv + i = (i << 1) + 1 + } + + // 16 bit + i = 0 + for _ in 0 .. 17 { + mut rv := u16(0) + mut bc := 0 + mut n := i + for bc < 16 { + rv = (rv << 1) | (u16(n) & 0x01) + bc++ + n = n >> 1 + } + // C.printf("x:%04x lz: %llu cmp: %d\n", u16(i), reverse_16(u16(i)), rv) + assert reverse_16(u16(i)) == rv + i = (i << 1) + 1 + } + + // 32 bit + i = 0 + for _ in 0 .. 33 { + mut rv := u32(0) + mut bc := 0 + mut n := i + for bc < 32 { + rv = (rv << 1) | (u32(n) & 0x01) + bc++ + n = n >> 1 + } + // C.printf("x:%08x lz: %llu cmp: %d\n", u32(i), reverse_32(u32(i)), rv) + assert reverse_32(u32(i)) == rv + i = (i << 1) + 1 + } + + // 64 bit + i1 = 0 + for _ in 0 .. 64 { + mut rv := u64(0) + mut bc := 0 + mut n := i1 + for bc < 64 { + rv = (rv << 1) | (n & 0x01) + bc++ + n = n >> 1 + } + // C.printf("x:%016llx lz: %016llx cmp: %016llx\n", u64(i1), reverse_64(u64(i1)), rv) + assert reverse_64(i1) == rv + i1 = (i1 << 1) + 1 + } + + // + // --- add --- + // + + // 32 bit + i = 1 + for x in 0 .. 32 { + v := u32(i) << x + sum, carry := add_32(v, v, u32(0)) + // C.printf("x:%08x [%llu,%llu] %llu\n", u32(i) << x, sum, carry, u64(v) + u64(v)) + assert ((u64(carry) << 32) | u64(sum)) == u64(v) + u64(v) + } + mut sum_32t, mut carry_32t := add_32(0x8000_0000, 0x8000_0000, u32(0)) + assert sum_32t == u32(0) + assert carry_32t == u32(1) + + sum_32t, carry_32t = add_32(0xFFFF_FFFF, 0xFFFF_FFFF, u32(1)) + assert sum_32t == 0xFFFF_FFFF + assert carry_32t == u32(1) + + // 64 bit + i = 1 + for x in 0 .. 63 { + v := u64(i) << x + sum, carry := add_64(v, v, u64(0)) + // C.printf("x:%16x [%llu,%llu] %llu\n", u64(i) << x, sum, carry, u64(v >> 32) + u64(v >> 32)) + assert ((carry << 32) | sum) == v + v + } + mut sum_64t, mut carry_64t := add_64(0x8000_0000_0000_0000, 0x8000_0000_0000_0000, + u64(0)) + assert sum_64t == u64(0) + assert carry_64t == u64(1) + + sum_64t, carry_64t = add_64(0xFFFF_FFFF_FFFF_FFFF, 0xFFFF_FFFF_FFFF_FFFF, u64(1)) + assert sum_64t == 0xFFFF_FFFF_FFFF_FFFF + assert carry_64t == u64(1) + + // + // --- sub --- + // + + // 32 bit + i = 1 + for x in 1 .. 32 { + v0 := u32(i) << x + v1 := v0 >> 1 + mut diff, mut borrow_out := sub_32(v0, v1, u32(0)) + // C.printf("x:%08x [%llu,%llu] %08x\n", u32(i) << x, diff, borrow_out, v0 - v1) + assert diff == v1 + + diff, borrow_out = sub_32(v0, v1, u32(1)) + // C.printf("x:%08x [%llu,%llu] %08x\n", u32(i) << x, diff, borrow_out, v0 - v1) + assert diff == (v1 - 1) + assert borrow_out == u32(0) + + diff, borrow_out = sub_32(v1, v0, u32(1)) + // C.printf("x:%08x [%llu,%llu] %08x\n", u32(i) << x, diff, borrow_out, v1 - v0) + assert borrow_out == u32(1) + } + + // 64 bit + i = 1 + for x in 1 .. 64 { + v0 := u64(i) << x + v1 := v0 >> 1 + mut diff, mut borrow_out := sub_64(v0, v1, u64(0)) + // C.printf("x:%08x [%llu,%llu] %08x\n", u64(i) << x, diff, borrow_out, v0 - v1) + assert diff == v1 + + diff, borrow_out = sub_64(v0, v1, u64(1)) + // C.printf("x:%08x [%llu,%llu] %08x\n", u64(i) << x, diff, borrow_out, v0 - v1) + assert diff == (v1 - 1) + assert borrow_out == u64(0) + + diff, borrow_out = sub_64(v1, v0, u64(1)) + // C.printf("x:%08x [%llu,%llu] %08x\n",u64(i) << x, diff, borrow_out, v1 - v0) + assert borrow_out == u64(1) + } + + // + // --- mul --- + // + + // 32 bit + i = 1 + for x in 0 .. 32 { + v0 := u32(i) << x + v1 := v0 - 1 + hi, lo := mul_32(v0, v1) + assert (u64(hi) << 32) | (u64(lo)) == u64(v0) * u64(v1) + } + + // 64 bit + i = 1 + for x in 0 .. 64 { + v0 := u64(i) << x + v1 := v0 - 1 + hi, lo := mul_64(v0, v1) + // C.printf("v0: %llu v1: %llu [%llu,%llu] tt: %llu\n", v0, v1, hi, lo, (v0 >> 32) * (v1 >> 32)) + assert (hi & 0xFFFF_FFFF_0000_0000) == (((v0 >> 32) * (v1 >> 32)) & 0xFFFF_FFFF_0000_0000) + assert (lo & 0x0000_0000_FFFF_FFFF) == (((v0 & 0x0000_0000_FFFF_FFFF) * (v1 & 0x0000_0000_FFFF_FFFF)) & 0x0000_0000_FFFF_FFFF) + } + + // + // --- div --- + // + + // 32 bit + i = 1 + for x in 0 .. 31 { + hi := u32(i) << x + lo := hi - 1 + y := u32(3) << x + quo, rem := div_32(hi, lo, y) + // C.printf("[%08x_%08x] %08x (%08x,%08x)\n", hi, lo, y, quo, rem) + tst := ((u64(hi) << 32) | u64(lo)) + assert quo == (tst / u64(y)) + assert rem == (tst % u64(y)) + assert rem == rem_32(hi, lo, y) + } + + // 64 bit + i = 1 + for x in 0 .. 62 { + hi := u64(i) << x + lo := u64(2) // hi - 1 + y := u64(0x4000_0000_0000_0000) + quo, rem := div_64(hi, lo, y) + // C.printf("[%016llx_%016llx] %016llx (%016llx,%016llx)\n", hi, lo, y, quo, rem) + assert quo == u64(2) << (x + 1) + _, rem1 := div_64(hi % y, lo, y) + assert rem == rem1 + assert rem == rem_64(hi, lo, y) + } +} |