Hi,
This patch reimplements `VectorShuffle` implementations to be a vector of the
bit type. Currently, VectorShuffle is stored as a byte array, and would be
expanded upon usage. This poses several drawbacks:
1. Inefficient conversions between a shuffle and its corresponding vector. This
hinders the performance when the shuffle indices are not constant and are
loaded or computed dynamically.
2. Redundant expansions in `rearrange` operations. On all platforms, it seems
that a shuffle index vector is always expanded to the correct type before
executing the `rearrange` operations.
3. Some redundant intrinsics are needed to support this handling as well as
special considerations in the C2 compiler.
4. Range checks are performed using `VectorShuffle::toVector`, which is
inefficient for FP types since both FP conversions and FP comparisons are more
expensive than the integral ones.
Upon these changes, a `rearrange` can emit more efficient code:
var species = IntVector.SPECIES_128;
var v1 = IntVector.fromArray(species, SRC1, 0);
var v2 = IntVector.fromArray(species, SRC2, 0);
v1.rearrange(v2.toShuffle()).intoArray(DST, 0);
Before:
movabs $0x751589fa8,%r10 ; {oop([I{0x0000000751589fa8})}
vmovdqu 0x10(%r10),%xmm2
movabs $0x7515a0d08,%r10 ; {oop([I{0x00000007515a0d08})}
vmovdqu 0x10(%r10),%xmm1
movabs $0x75158afb8,%r10 ; {oop([I{0x000000075158afb8})}
vmovdqu 0x10(%r10),%xmm0
vpand -0xddc12(%rip),%xmm0,%xmm0 # Stub::vector_int_to_byte_mask
; {external_word}
vpackusdw %xmm0,%xmm0,%xmm0
vpackuswb %xmm0,%xmm0,%xmm0
vpmovsxbd %xmm0,%xmm3
vpcmpgtd %xmm3,%xmm1,%xmm3
vtestps %xmm3,%xmm3
jne 0x00007fc2acb4e0d8
vpmovzxbd %xmm0,%xmm0
vpermd %ymm2,%ymm0,%ymm0
movabs $0x751588f98,%r10 ; {oop([I{0x0000000751588f98})}
vmovdqu %xmm0,0x10(%r10)
After:
movabs $0x751589c78,%r10 ; {oop([I{0x0000000751589c78})}
vmovdqu 0x10(%r10),%xmm1
movabs $0x75158ac88,%r10 ; {oop([I{0x000000075158ac88})}
vmovdqu 0x10(%r10),%xmm2
vpxor %xmm0,%xmm0,%xmm0
vpcmpgtd %xmm2,%xmm0,%xmm3
vtestps %xmm3,%xmm3
jne 0x00007fa818b27cb1
vpermd %ymm1,%ymm2,%ymm0
movabs $0x751588c68,%r10 ; {oop([I{0x0000000751588c68})}
vmovdqu %xmm0,0x10(%r10)
Please take a look and leave reviews. Thanks a lot.
-------------
Commit messages:
- fix internal types, clean up
- optimise laneIsValid
- Merge branch 'master' into shufflerefactor
- small beautifications
- other architecture
- fix mismatched fp vector payload types
- draft
Changes: https://git.openjdk.org/jdk/pull/13093/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13093&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8304450
Stats: 4440 lines in 62 files changed: 2567 ins; 651 del; 1222 mod
Patch: https://git.openjdk.org/jdk/pull/13093.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/13093/head:pull/13093
PR: https://git.openjdk.org/jdk/pull/13093
