Exemple #1
0
func TestCtz64(t *testing.T) {
	for i := uint(0); i <= 64; i++ {
		x := uint64(5) << i
		if got := sys.Ctz64(x); got != uint64(i) {
			t.Errorf("Ctz64(%d)=%d, want %d", x, got, i)
		}
	}
}
Exemple #2
0
func test(i, x uint64) {
	t := T.Ctz64(x) // ERROR "intrinsic substitution for Ctz64"
	if i != t {
		logf("Ctz64(0x%x) expected %d but got %d\n", x, i, t)
	}
	x = -x
	t = T.Ctz64(x) // ERROR "intrinsic substitution for Ctz64"
	if i != t {
		logf("Ctz64(0x%x) expected %d but got %d\n", x, i, t)
	}

	if i <= 32 {
		x32 := uint32(x)
		t32 := T.Ctz32(x32) // ERROR "intrinsic substitution for Ctz32"
		if uint32(i) != t32 {
			logf("Ctz32(0x%x) expected %d but got %d\n", x32, i, t32)
		}
		x32 = -x32
		t32 = T.Ctz32(x32) // ERROR "intrinsic substitution for Ctz32"
		if uint32(i) != t32 {
			logf("Ctz32(0x%x) expected %d but got %d\n", x32, i, t32)
		}
	}
	if i <= 16 {
		x16 := uint16(x)
		t16 := T.Ctz16(x16) // ERROR "intrinsic substitution for Ctz16"
		if uint16(i) != t16 {
			logf("Ctz16(0x%x) expected %d but got %d\n", x16, i, t16)
		}
		x16 = -x16
		t16 = T.Ctz16(x16) // ERROR "intrinsic substitution for Ctz16"
		if uint16(i) != t16 {
			logf("Ctz16(0x%x) expected %d but got %d\n", x16, i, t16)
		}
	}
}
Exemple #3
0
func main() {
	// Test Bswap first because the other test relies on it
	// working correctly (to implement bit reversal).
	for i := range A {
		x := A[i]
		y := B[i]
		X := T.Bswap64(x) // ERROR "intrinsic substitution for Bswap64"
		Y := T.Bswap64(y) // ERROR "intrinsic substitution for Bswap64"
		if y != X {
			logf("Bswap64(0x%08x) expected 0x%08x but got 0x%08x\n", x, y, X)
		}
		if x != Y {
			logf("Bswap64(0x%08x) expected 0x%08x but got 0x%08x\n", y, x, Y)
		}

		x32 := uint32(X)
		y32 := uint32(Y >> 32)

		X32 := T.Bswap32(x32) // ERROR "intrinsic substitution for Bswap32"
		Y32 := T.Bswap32(y32) // ERROR "intrinsic substitution for Bswap32"
		if y32 != X32 {
			logf("Bswap32(0x%08x) expected 0x%08x but got 0x%08x\n", x32, y32, X32)
		}
		if x32 != Y32 {
			logf("Bswap32(0x%08x) expected 0x%08x but got 0x%08x\n", y32, x32, Y32)
		}
	}

	// Zero is a special case, be sure it is done right.
	if T.Ctz16(0) != 16 { // ERROR "intrinsic substitution for Ctz16"
		logf("ctz16(0) != 16")
	}
	if T.Ctz32(0) != 32 { // ERROR "intrinsic substitution for Ctz32"
		logf("ctz32(0) != 32")
	}
	if T.Ctz64(0) != 64 { // ERROR "intrinsic substitution for Ctz64"
		logf("ctz64(0) != 64")
	}

	for i := uint64(0); i <= 64; i++ {
		for j := uint64(1); j <= 255; j += 2 {
			for k := uint64(1); k <= 65537; k += 128 {
				x := (j * k) << i
				test(i, x)
			}
		}
	}
}
Exemple #4
0
// nextFreeFast returns the next free object if one is quickly available.
// Otherwise it returns 0.
func nextFreeFast(s *mspan) gclinkptr {
	theBit := sys.Ctz64(s.allocCache) // Is there a free object in the allocCache?
	if theBit < 64 {
		result := s.freeindex + uintptr(theBit)
		if result < s.nelems {
			freeidx := result + 1
			if freeidx%64 == 0 && freeidx != s.nelems {
				return 0
			}
			s.allocCache >>= (theBit + 1)
			s.freeindex = freeidx
			v := gclinkptr(result*s.elemsize + s.base())
			s.allocCount++
			return v
		}
	}
	return 0
}