On 7/8/2021 3:50 AM, Andrew Haley wrote:
On Thu, 8 Jul 2021 09:43:35 GMT, Andrew Haley <a...@openjdk.org> wrote:
Moves between GPRs and FPRs are often slow. There's a 10-cycle latency on some
AArch64, so we avoid it whenever we can. Mind you, we don't care about this
patch because we always generate FABS from an intrinsic anyway.
For avoidance of doubt, that's the round-trip latency.
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PR: https://git.openjdk.java.net/jdk/pull/4711
For coding this functionality in Java, the natural way to do this uses
either an if statement or the bit-wise conversion, which usually implies
GPRs to/from FPRs movement. I don't see a way to avoid both an if
statement and bitwise conversion.
-Joe
