[clang] Declare __fp8_rcpe6m2 scalar type (pto-spec#322) - #97
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RCPE6M2 (PTO-ISA type code 21) is a source-only derived reciprocal type that reuses the E6M2 code space. Declare the __fp8_rcpe6m2 element type alongside __fp8_e6m2 so the TileOP header surface can name it. Scalar casts are intentionally left disabled (commented out), mirroring __fp8_e6m2: RCPE6M2 has no destination encoding and no scalar FCVT form, and is consumed only via the TileOP tile-level conversion (RCPE6M2 -> FP16/BF16). No v.cvt/scalar codegen is enabled. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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背景
配合 pto-spec#322 与 Linx-TileOP-API PR llvm#165：RCPE6M2（PTO-ISA 类型码 21）是复用 E6M2 码空间的源专用倒数派生类型。
改动
在
clang/lib/Headers/linx_blkc.h中，紧随__fp8_e6m2声明__fp8_rcpe6m2元素类型（TYPE/MAJOR_TYPE/WIDTH/STORAGE 宏），使 TileOP 头文件接口可以命名该类型。标量 cast 有意保持注释禁用（与
__fp8_e6m2一致）：RCPE6M2 无目标编码、无标量 FCVT 形式，仅通过 TileOP 的 tile 级转换消费（RCPE6M2 → FP16/BF16）。不启用任何v.cvt/标量 codegen。关联
🤖 Generated with Claude Code