JDK-8026049 : (bf) Intrinsify ByteBuffer.put{Int,Double,Float,...} methods
- Type: Enhancement
- Component: core-libs
- Sub-Component: java.nio
- Affected Version: 9
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2013-10-08
- Updated: 2017-08-10
- Resolved: 2015-03-31
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| JDK 9 |
|---|
9 b64Fixed  |
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Description
I think the issue can also be solved with VM intrinsics, but it seems simpler to do it with s.m.Unsafe. Current code for non-byte ByteBuffer calls all the way down to Bits, which does:
static void putIntB(ByteBuffer bb, int bi, int x) {
bb._put(bi , int3(x));
bb._put(bi + 1, int2(x));
bb._put(bi + 2, int1(x));
bb._put(bi + 3, int0(x));
}
The compiler is known to produce distinct writes in these cases. It is beneficial to replace byte-wide stores into the full-width stores. The caveats include: misaligned reads/writes, handling endianness, etc.
Comments
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