> Vector API `lanewise BITWISE_BLEND` on AArch64 is currently lowered to a > generic vector sequence built from `(XorV(AndV(XorV)))` nodes. AArch64 > provides a more efficient mapping for this operation through the NEON `BSL` > and SVE `BSL` (bitwise select) instructions. > > This change teaches C2 to recognize the `BITWISE_BLEND` patterns and lower > them to the dedicated AArch64 instructions for better performance. > > The change includes the AArch64 match rules and assembler support, updates > the AArch64 asm tests, adds IR framework nodes for the new mach instructions, > introduces a new jtreg IR test and extends the MaskedLogicOpts JMH benchmark > for 128-bit long type. > > JMH results show **11% - 54%** performance improvements for the optimized > cases, and all jtreg tests (tier1, tier2 and tier3) passe on SVE2, SVE1, and > NEON configurations. > > On a Nvidia Grace (Neoverse-V2) machine with 128-bit SVE2: > > Benchmark Unit ARRAYLEN Before Error > After Error Uplift > bitwiseBlendOperationInt128 ops/s 256.00 3787.49 5.29 > 4277.64 8.89 1.13 > bitwiseBlendOperationInt128 ops/s 512.00 1888.24 11.02 > 2143.21 6.32 1.14 > bitwiseBlendOperationInt128 ops/s 1024.00 938.22 6.24 > 1053.45 14.68 1.12 > bitwiseBlendOperationLong128 ops/s 256.00 1895.45 13.68 2140.31 > 3.68 1.13 > bitwiseBlendOperationLong128 ops/s 512.00 938.71 5.32 1052.16 > 14.07 1.12 > bitwiseBlendOperationLong128 ops/s 1024.00 474.15 2.33 526.49 > 2.62 1.11 > > > On an AWS Graviton3 (Neoverse-V1) machine with 256-bit SVE1: > > Benchmark Unit ARRAYLEN Before Error > After Error Uplift > bitwiseBlendOperationInt128 ops/s 256.00 2051.52 13.85 > 2481.44 0.27 1.21 > bitwiseBlendOperationInt128 ops/s 512.00 995.47 20.77 > 1235.10 5.70 1.24 > bitwiseBlendOperationInt128 ops/s 1024.00 507.73 9.83 > 617.59 2.43 1.22 > bitwiseBlendOperationLong128 ops/s 256.00 1000.99 21.50 1235.39 > 5.48 1.23 > bitwiseBlendOperationLong128 ops/s 512.00 507.73 9.74 617.67 > 2.32 1.22 > bitwiseBlendOperationLong128 ops/s 1024.00 258.86 0.01 310.70 > 0.04 1.20 > > > On a Nvidia Grace (Neoverse-V2) machine with 128-bit NEON: > > Benchmark Unit ARRAYLEN Before Error > After Error Uplift > bitwiseBlendOperationInt128 ops/s 256.00 2336.17 13.18 > 3505.19 19.61 1.50 > bitwiseBlendOperationInt128 ops/s 512.00 1145.50 12.40 > 1735.24 10.43 1.51 > bitwiseBlendOperationInt128 ops/s 1...
Eric Fang has updated the pull request incrementally with one additional commit since the last revision: Add a movprfx optimization entry point for the newly added sve_bsl instruction ------------- Changes: - all: https://git.openjdk.org/jdk/pull/31269/files - new: https://git.openjdk.org/jdk/pull/31269/files/6574f70c..f4723a0b Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=31269&range=04 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=31269&range=03-04 Stats: 12 lines in 1 file changed: 6 ins; 0 del; 6 mod Patch: https://git.openjdk.org/jdk/pull/31269.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/31269/head:pull/31269 PR: https://git.openjdk.org/jdk/pull/31269
