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sail: implement HL.ADDI/ADDIW/SUBI/SUBIW#77

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codex/sail-coverage-hl-arith-imm
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sail: implement HL.ADDI/ADDIW/SUBI/SUBIW#77
zhoubot wants to merge 1 commit intomainfrom
codex/sail-coverage-hl-arith-imm

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@zhoubot zhoubot commented Mar 2, 2026

Implements HL (48-bit) arithmetic-immediate semantics:

  • HL.ADDI / HL.SUBI (64-bit add/sub with uimm24)
  • HL.ADDIW / HL.SUBIW (32-bit add/sub with uimm24, sign-extend 32-bit result)

These mirror the base 32-bit instruction semantics with a wider immediate.

Coverage: implemented_forms 495 -> 499 (+4 forms, cumulative across open PRs).

NOTE: per team rule, do not merge coverage-only PRs until cumulative delta >= 5% unless explicitly requested.

@zhoubot zhoubot requested a review from a team as a code owner March 2, 2026 02:56
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