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feat: intros_llvm tactic #1227

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feat: intros_llvm tactic #1227

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19 changes: 19 additions & 0 deletions SSA/Projects/InstCombine/Tactic/SimpLLVM.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -117,3 +117,22 @@ macro "simp_alive_ops" : tactic =>
(BitVec.ofInt_ofNat)
]
))

/-! ## `llvm_intros` -/

/--
`intros_llvm x` will introduce as many binders as possible without unfolding
definitions, just like `intros` (without passing any identifiers) would.
However, unlike `intros`, `intros_llvm x` will give the new variables
*accessible* names, with `x` as a prefix.

This tactic is intended for use with the `simp_llvm..` / `simp_alive..` family
of tactics, hence the name.
-/
elab "intros_llvm" x:ident : tactic => do
let x := x.getId
let ⟨newFVars, newGoal⟩ ← (← getMainGoal).intros
let mut goal := newGoal
for fvar in newFVars do
goal ← goal.rename fvar (← Meta.getUnusedUserName x)
replaceMainGoal [goal]
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