compilers: add MSVC - #2
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Expands the codegen-detection section with the probe-verified fingerprint matrix (division magic, loop-alignment nops, SSE2 FPU, rep string ops, stack probes, /GS, 16-bit line) compiled through every preserved CL.EXE at /O1 and /O2.
Expands the codegen-by-version section with the second probe's verified findings: division-tail discriminators (mov eax,edx-then-shift for VC 5.0/6.0 vs shr-edx-first for 7.0+, signed-div ECX round-trip, memory-operand imul from VC 10.0+), the FP +1.0 encoding split (fld1 / VC 5.0 fsub-with-negated-constant / fadd / SSE2 handoff), rol for rotates from VC 8.0+, cmov for min/max/clamp in VC 11.0, cdq-abs in VC 10.0+, and the proven non-discriminators (VC 6.0 SP levels and VC 4.x are codegen-identical; 64-bit arithmetic stays helper calls).
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Updated again: the codegen-by-version section now carries the probe-2 verified markers — division-tail discriminators (VC 5.0/6.0
mov eax,edx-then-shift vs VC 7.0+shr edx,N-first, the signed-div ECX round-trip, memory-operandimul [esp+4]from VC 10.0+), the four-way FP+1.0encoding (fld1 / VC 5.0 fsub-with-negated-constant / fadd / SSE2 handoff),rolfor rotates from VC 8.0+,cmovfor min/max/clamp in VC 11.0, cdq-abs in VC 10.0+, and the proven non-discriminators (VC 6.0 SP levels and VC 4.x codegen-identical; 64-bit arithmetic stays helper calls). All verified by compiling probe #2 through every preserved CL.EXE plus all six VC 6.0 SP images.