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8183574: Unify the is_power_of_2 functions

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Reviewed-by: kbarrett, redestad
This commit is contained in:
Stefan Karlsson 2020-02-17 10:03:17 +01:00
parent 248b61710e
commit e4b27a48a0
100 changed files with 183 additions and 75 deletions
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22
src/hotspot/share/utilities/globalDefinitions.hpp
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@ -988,16 +988,6 @@ inline T clamp(T value, T min, T max) {
return MIN2(MAX2(value, min), max);
}
// true if x is a power of 2, false otherwise
inline bool is_power_of_2(intptr_t x) {
return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
}
// long version of is_power_of_2
inline bool is_power_of_2_long(jlong x) {
return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
}
// Returns largest i such that 2^i <= x.
// If x == 0, the function returns -1.
inline int log2_intptr(uintptr_t x) {
@ -1051,18 +1041,6 @@ inline int log2_jlong(jlong x) {
return log2_long((julong)x);
}
//* the argument must be exactly a power of 2
inline int exact_log2(intptr_t x) {
assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
return log2_intptr(x);
}
//* the argument must be exactly a power of 2
inline int exact_log2_long(jlong x) {
assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
return log2_long(x);
}
inline bool is_odd (intx x) { return x & 1; }
inline bool is_even(intx x) { return !is_odd(x); }