Hi All,
This patch adds C2 compiler support for various Float16 operations added by
[PR#22128](https://github.com/openjdk/jdk/pull/22128)
Following is the summary of changes included with this patch:-
1. Detection of various Float16 operations through inline expansion or pattern
folding idealizations.
2. Float16 operations like add, sub, mul, div, max, and min are inferred
through pattern folding idealization.
3. Float16 SQRT and FMA operation are inferred through inline expansion and
their corresponding entry points are defined in the newly added Float16Math
class.
- These intrinsics receive unwrapped short arguments encoding IEEE 754
binary16 values.
5. New specialized IR nodes for Float16 operations, associated idealizations,
and constant folding routines.
6. New Ideal type for constant and non-constant Float16 IR nodes. Please refer
to [FAQs
](https://github.com/openjdk/jdk/pull/22754#issuecomment-2543982577)for more
details.
7. Since Float16 uses short as its storage type, hence raw FP16 values are
always loaded into general purpose register, but FP16 ISA instructions
generally operate over floating point registers, therefore compiler injectes
reinterpretation IR before and after Float16 operation nodes to move short
value to floating point register and vice versa.
8. New idealization routines to optimize redundant reinterpretation chains.
HF2S + S2HF = HF
6. Auto-vectorization of newly supported scalar operations.
7. X86 and AARCH64 backend implementation for all supported intrinsics.
9. Functional and Performance validation tests.
Kindly review and share your feedback.
Best Regards,
Jatin
-------------
Commit messages:
- C2 compiler support for float16 scalar operations.
Changes: https://git.openjdk.org/jdk/pull/22754/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22754&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8342103
Stats: 2633 lines in 54 files changed: 2589 ins; 0 del; 44 mod
Patch: https://git.openjdk.org/jdk/pull/22754.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/22754/head:pull/22754
PR: https://git.openjdk.org/jdk/pull/22754
