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Backport JDK-8280476 fix #191

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Backport JDK-8280476 fix #191

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11 changes: 10 additions & 1 deletion src/hotspot/cpu/aarch64/immediate_aarch64.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -129,6 +129,16 @@ static inline uint32_t uimm(uint32_t val, int hi, int lo)

uint64_t replicate(uint64_t bits, int nbits, int count)
{
assert(count > 0, "must be");
assert(nbits > 0, "must be");
assert(count * nbits <= 64, "must be");

// Special case nbits == 64 since the shift below with that nbits value
// would result in undefined behavior.
if (nbits == 64) {
return bits;
}

uint64_t result = 0;
// nbits may be 64 in which case we want mask to be -1
uint64_t mask = ones(nbits);
Expand Down Expand Up @@ -363,4 +373,3 @@ uint32_t encoding_for_fp_immediate(float immediate)
res = (s << 7) | (r << 4) | f;
return res;
}