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sail: implement HL.CCAT/HL.CCATW#76

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zhoubot wants to merge 3 commits intomainfrom
codex/sail-coverage-hl-ccat
Open

sail: implement HL.CCAT/HL.CCATW#76
zhoubot wants to merge 3 commits intomainfrom
codex/sail-coverage-hl-ccat

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@zhoubot zhoubot commented Mar 2, 2026

Implements HL.CCAT and HL.CCATW semantics (confirmed):

  • X128 = (SrcL << 64) | SrcR
  • Y128 = X128 << shamt (logical shift-left, shamt in 0..127)
  • Dst0 = low64(Y128), Dst1 = high64(Y128)

CCATW currently shares the same 128-bit barrel-concat semantics as CCAT (until a word-lane-specific definition is introduced).

Coverage: implemented_forms 498 -> 500 (+2 forms).

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 02:51
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