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Reduce the size of the num_fres field in the Function Descriptor Entry (FDE) from 32 bits to 16 bits. The number of Frame Row Entries (FREs) for a single function is extremely unlikely to exceed 65,535 in real-world scenarios. Reducing this field saves 2 bytes per FDE, contributing to a smaller overall SFrame section size. (BTW, these savings will be eaten up by a later commit which adds support for text > 2 GiB by increasing an offset from int32_t to int64_t). Safety checks are added to the assembler to warn and skip SFrame FDE generation if a function's FRE count exceeds UINT16_MAX. Note regarding alignment: With the current patch, the members of sframe_func_desc_entry_v3 are not at aligned boundaries anymore. Recall that all sframe_func_desc_entry_v3 entries are stored together in the "SFrame FDE sub-section" forming an index. Only after a later patch in the series "[29/36] [SFrame-V3] include: gas: libsframe: split FDE into desc and attr" will the alignment properties of SFrame index will be restored. include/ * sframe.h (sframe_func_desc_entry_v3): Change sfde_func_num_fres type to uint16_t. gas/ * gen-sframe.c (output_sframe_funcdesc): Write 2 bytes for num_fres and assert it fits in uint16_t. (sframe_do_fde): Add check to skip FDE emission if num_fres exceeds UINT16_MAX. libsframe/ * sframe.c (sframe_encoder_write_fde): Cast num_fres to uint16_t to ensure correctly written out data. * testsuite/libsframe.decode/DATA2: Update binary test data.
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