On Mon, 25 Nov 2024 20:04:09 GMT, Jatin Bhateja <jbhat...@openjdk.org> wrote:
>> 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/21490#issuecomment-2482867818)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 > > Jatin Bhateja has updated the pull request incrementally with one additional > commit since the last revision: > > Review comments resolution test/hotspot/jtreg/compiler/c2/irTests/TestFloat16ScalarOperations.java line 201: > 199: > 200: @Test > 201: @IR(counts = {IRNode.MUL_HF, " >0 ", IRNode.REINTERPRET_S2HF, " >0 > ", IRNode.REINTERPRET_HF2S, " >0 "}, There's a bit of inconsistency in format for " >0 ". In some of the IR rules above, it's "> 0" and here it's " >0 ". Maybe follow a single format? ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/21490#discussion_r1858720659
