Cesarus85--mjolnir-vr/docs/object_matching_logs/libcmt_frnd_obj.md

libs/libcmt/frnd.obj provenance park ledger

This atomic lane starts from campaign commit 8447e220. At lane start libs/libcmt/frnd.c was config index 639 with status MISSING. The object was absent from config/parked.json, every Git ref and worktree, and all active agent ownership lists. The January split target is present. Production source and config remain untouched because primary provenance proves the function is implemented with inline x87 assembly.

Plain-English behavior

_frnd rounds a double to an integral double using the x87 control word's current rounding mode. It deliberately does not mean only floor, ceiling, truncate, or round-to-nearest: the result depends on the caller's active x87 rounding-control bits. The x87 operation also has its own NaN, infinity, denormal, and floating-point-exception behavior.

January inventory

The target owns one external COMDAT function and no runtime data:

• _frnd: 0x13 bytes, zero relocations, normalized SHA-256 b2acfb60d9432e4ad64781ac801918ada55d9c22650b1504c4ee039ed85da31f;
• .text flags 0x60101020, pick-no-duplicates, one-byte alignment;
• no target-owned .rdata, .data, or .bss;
• no aliases.

Its instruction sequence allocates an eight-byte temporary, loads the double argument, executes frndint, stores the rounded value to the temporary, reloads that value as the x87 return, releases the temporary, and returns.

Primary XDK 3911 provenance

The locally archived XDK 3911 libcmt.lib has SHA-256 60aa4c87c97eeb6662b31d9d37cf3caba1afabaec72c47b090e7a0ce8b632f55. Its obj\i386\frnd.obj member has SHA-256 e06cbd3b43d3f0c124761dc0bdda28d4c8cd1807f0aa41ea329e90c84a021378 and records:

• compiler id 0x001c2426;
• source path d:\xbox-finalfre\private\sdktools\crt\fpw32\tran\i386\frnd.c;
• public prototype evidence for _frnd, one double argument named x, and a double stack local named result;
• source line records spanning lines 31 through 45.

Most importantly, the line table maps function offsets to consecutive source lines as follows:

Offset	Source line	Instruction
+0x02	36	fld x
+0x06	37	frndint
+0x08	38	fstp result
+0x0c	44	compiler reload of result for the return
+0x10	45	epilogue/return

Those three consecutive source-line mappings, together with the named x and result debug records, identify the historical body as an inline-assembly block embedded in a .c source file. This is stronger evidence than the .c suffix alone and prevents incorrectly classifying the unit as natural C.

The XDK member's runtime function passes section_infos_equal directly against January: 0x13/0x13 bytes, zero relocations, the same normalized hash, and identical COMDAT ownership/selection/alignment. Its extra .debug$S, .debug$F, and .debug$T sections are compiler metadata, not runtime data.

Experiment matrix

ID	Evidence or source shape	Size T/B	Relocs T/B	Hash/result	Decision
P01	Compare exact XDK archive member to January	0x13/0x13	0/0	strict exact, b2acfb60...da31f	accepted as provenance only
S01	Natural readable-C reconstruction	not compiled	not compiled	no source-faithful C operation exposes current-mode frndint under this compiler	rejected before production edit
S02	Historical inline x87 assembly body	would reproduce the archive	0/0	prohibited by campaign policy	never introduced

No production source shape was attempted. That is intentional, not missing work: the task requires readable C only, while the recovered implementation is inline assembly. A cast through an integer would use conversion instructions, would fail for values outside the integer range, and would change floating- point exceptions. floor, ceil, and truncation implement fixed modes rather than the current control-word mode and introduce calls or additional control- word manipulation. None is a semantic or byte-exact substitute.

Disposition and reopen criteria

frnd.obj remains MISSING and receives no exact-match credit. No source, config status, parked ledger, compiler flags, comparator rule, or semantic exception is changed. The unit is parked by documentation as proven vendored inline assembly.

The unchanged halobetacache_build and libcmt_build pass. The progress report passes at 310/833 objects overall, 267/468 Halo objects, and 43/212 libcmt objects; none of that credit comes from frnd. The semantic audit scans 413 units, accepts 3,389 exact functions, and reports zero unit errors. All 179 tooling tests pass. A production forced rebuild is deliberately not possible because no policy-compliant candidate source/object exists; the reproducible strict check is the independently extracted XDK member against the January target, which passes byte and ownership equality as recorded above. The regression tool correctly rejects libs/libcmt/frnd as an unknown objdiff unit because a MISSING object has no candidate build edge. Its campaign-wide --all mode is independently blocked by the existing space-containing source/saved films/saved_films Ninja-edge parser issue. As an executable sentinel, a post-commit snapshot/check of the adjacent exact libs/libcmt/fp8 unit retains _setdefaultprecision with no failures or warnings. Together with the full unchanged builds and the one-file Git diff, this proves the documentation-only lane changes no production artifact without pretending that frnd has a candidate object.

Reopen only if campaign policy explicitly admits the verbatim Microsoft/XDK inline-assembly source with appropriate licensing/provenance handling, or if the exact compiler is independently demonstrated to emit frndint from a readable, defined-behavior C construct with the same current-rounding-mode and exception semantics. Similar-looking floor, cast, or modern rint source is not sufficient.

House/Berth and bug audit

The final repository change is documentation only. It does not disguise assembly as C, use volatile, force inlining, rely on undefined behavior, patch bytes, add opaque casts, alter alignment/flags, or weaken comparison. There is no original-game bug: current-rounding-mode behavior is the intended CRT operation. The explicit stop preserves both readability and the project's strict provenance standard.