tests: conform coverage for reserved funct7 decode - #398
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Follow-up to #358: executes a reserved OP encoding (funct7=0x3, funct3=0) via .insn and asserts the RTL-matching base-ALU decode (ADD). Under the pre-#358 SimX bug this word ran as MUL (r=63 instead of 16), so the test locks the SimX<->RTL decode parity in for CI (kernel category, simx + rtlsim, both XLENs). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Follow-up to #358 (which shipped without a test): a conform test that executes a reserved OP encoding (funct7=0x3, funct3=0) via
.insnand asserts the RTL-matching base-ALU decode (ADD).Validation
funct7 & 0x1): the test fails withr=63(the word ran as MUL) — verified the check catches exactly the divergence Fix M-extension funct7 decoding #358 fixed.Runs in CI via the kernel category (simx + rtlsim, both XLENs).
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