On Wed, 27 Apr 2022 11:03:48 GMT, Jatin Bhateja <jbhat...@openjdk.org> wrote:
> Hi All, > > Patch adds the planned support for new vector operations and APIs targeted > for [JEP 426: Vector API (Fourth > Incubator).](https://bugs.openjdk.java.net/browse/JDK-8280173) > > Following is the brief summary of changes:- > > 1) Extends the scope of existing lanewise API for following new vector > operations. > - VectorOperations.BIT_COUNT: counts the number of one-bits > - VectorOperations.LEADING_ZEROS_COUNT: counts the number of leading zero > bits > - VectorOperations.TRAILING_ZEROS_COUNT: counts the number of trailing > zero bits > - VectorOperations.REVERSE: reversing the order of bits > - VectorOperations.REVERSE_BYTES: reversing the order of bytes > - compress and expand bits: Semantics are based on Hacker's Delight > section 7-4 Compress, or Generalized Extract. > > 2) Adds following new APIs to perform cross lane vector compress and > expansion operations under the influence of a mask. > - Vector.compress > - Vector.expand > - VectorMask.compress > > 3) Adds predicated and non-predicated versions of following new APIs to load > and store the contents of vector from foreign MemorySegments. > - Vector.fromMemorySegment > - Vector.intoMemorySegment > > 4) C2 Compiler IR enhancements and optimized X86 and AARCH64 backend support > for each newly added operation. > > > Patch has been regressed over AARCH64 and X86 targets different AVX levels. > > Kindly review and share your feedback. > > Best Regards, > Jatin src/hotspot/cpu/aarch64/c2_MacroAssembler_aarch64.cpp line 1340: > 1338: assert_different_registers(dst, src, vtmp1, vtmp2, vtmp3, vtmp4); > 1339: assert_different_registers(mask, ptmp, pgtmp); > 1340: // Example input: src = 88 77 66 45 44 33 22 11 Suggestion: // Example input: src = 88 77 66 55 44 33 22 11 ------------- PR: https://git.openjdk.java.net/jdk/pull/8425
