From bfcbca52a117ec207addf629f1cada93e0f12e02 Mon Sep 17 00:00:00 2001
From: Greg Brown <greg.brown@cl.cam.ac.uk>
Date: Sun, 13 Feb 2022 14:01:44 +0000
Subject: Refactor to group instruction definitions together

---
 src/Helium/Data/Pseudocode.agda | 317 ----------------------------------------
 1 file changed, 317 deletions(-)
 delete mode 100644 src/Helium/Data/Pseudocode.agda

(limited to 'src/Helium/Data')

diff --git a/src/Helium/Data/Pseudocode.agda b/src/Helium/Data/Pseudocode.agda
deleted file mode 100644
index 9f936f2..0000000
--- a/src/Helium/Data/Pseudocode.agda
+++ /dev/null
@@ -1,317 +0,0 @@
-------------------------------------------------------------------------
--- Agda Helium
---
--- Definition of instructions using the Armv8-M pseudocode.
-------------------------------------------------------------------------
-
-{-# OPTIONS --safe --without-K #-}
-
-module Helium.Data.Pseudocode where
-
-open import Data.Bool as Bool using (true; false)
-open import Data.Fin as Fin using (Fin; Fin′; zero; suc; toℕ)
-open import Data.Nat as ℕ using (ℕ; zero; suc)
-import Data.Nat.Properties as ℕₚ
-open import Data.Sum using ([_,_]′)
-open import Data.Vec as Vec using (Vec; []; _∷_)
-open import Data.Vec.Relation.Unary.All using (All; []; _∷_)
-open import Function using (_$_)
-open import Helium.Data.Pseudocode.Core as Core public
-  hiding (module Code)
-import Helium.Instructions as Instr
-import Relation.Binary.PropositionalEquality as P
-open import Relation.Nullary.Decidable.Core using (True)
-
---- Types
-
-beat : Type
-beat = fin 4
-
-elmtMask : Type
-elmtMask = bits 4
-
---- State
-
-State : Vec Type _
-State = array (bits 32) 32      -- S
-      ∷ array (bits 32) 16      -- R
-      ∷ bits 16                 -- VPR-P0
-      ∷ bits 8                  -- VPR-mask
-      ∷ bit                     -- FPSCR-QC
-      ∷ bool                    -- _AdvanceVPTState
-      ∷ beat                    -- _BeatId
-      ∷ []
-
-open Core.Code State public
-
---- References
-
--- Direct from State
-
-S : ∀ {n Γ} → Expression {n} Γ (array (bits 32) 32)
-S = state 0
-
-R : ∀ {n Γ} → Expression {n} Γ (array (bits 32) 16)
-R = state 1
-
-VPR-P0 : ∀ {n Γ} → Expression {n} Γ (bits 16)
-VPR-P0 = state 2
-
-VPR-mask : ∀ {n Γ} → Expression {n} Γ (bits 8)
-VPR-mask = state 3
-
-FPSCR-QC : ∀ {n Γ} → Expression {n} Γ bit
-FPSCR-QC = state 4
-
-AdvanceVPTState : ∀ {n Γ} → Expression {n} Γ bool
-AdvanceVPTState = state 5
-
-BeatId : ∀ {n Γ} → Expression {n} Γ beat
-BeatId = state 6
-
--- Indirect
-
-group : ∀ {n Γ t k} m → Expression {n} Γ (asType t (k ℕ.* suc m)) → Expression Γ (array (asType t k) (suc m))
-group {k = k} zero    x = [ cast (P.trans (ℕₚ.*-comm k 1) (ℕₚ.+-comm k 0)) x ]
-group {k = k} (suc m) x = group m (slice x′ (lit (Fin.fromℕ k ′f))) ∶ [ slice (cast (ℕₚ.+-comm k _) x′) (lit (zero ′f))  ]
-  where
-  x′ = cast (P.trans (ℕₚ.*-comm k _) (P.cong (k ℕ.+_) (ℕₚ.*-comm _ k))) x
-
-join : ∀ {n Γ t k m} → Expression {n} Γ (array (asType t k) (suc m)) → Expression Γ (asType t (k ℕ.* suc m))
-join {k = k} {zero}  x = cast (P.trans (ℕₚ.+-comm 0 k) (ℕₚ.*-comm 1 k)) (unbox x)
-join {k = k} {suc m} x = cast eq (join (slice x (lit (Fin.fromℕ 1 ′f))) ∶ unbox (slice {i = suc m} (cast (ℕₚ.+-comm 1 _) x) (lit (zero ′f))))
-  where
-  eq = P.trans (P.cong (k ℕ.+_) (ℕₚ.*-comm k (suc m))) (ℕₚ.*-comm (suc (suc m)) k)
-
-index : ∀ {n Γ t m} → Expression {n} Γ (asType t (suc m)) → Expression Γ (fin (suc m)) → Expression Γ (elemType t)
-index {t = bits}    {m} x i = slice (cast (ℕₚ.+-comm 1 m) x) i
-index {t = array _} {m} x i = unbox (slice (cast (ℕₚ.+-comm 1 m) x) i)
-
-Q : ∀ {n Γ} → Expression {n} Γ (array (array (bits 32) 4) 8)
-Q = group 7 S
-
-elem : ∀ {n Γ t k} m → Expression {n} Γ (asType t (k ℕ.* m)) → Expression Γ (fin k) → Expression Γ (asType t m)
-elem {k = zero}  m       x i = abort i
-elem {k = suc k} zero    x i = cast (ℕₚ.*-comm k 0) x
-elem {k = suc k} (suc m) x i = index (group k (cast (ℕₚ.*-comm (suc k) (suc m)) x)) i
-
---- Other utiliies
-
-hasBit : ∀ {n Γ m} → Expression {n} Γ (bits (suc m)) → Expression Γ (fin (suc m)) → Expression Γ bool
-hasBit {n} x i = index x i ≟ lit ((true ∷ []) ′x)
-
-sliceⁱ : ∀ {n Γ m} → ℕ → Expression {n} Γ int → Expression Γ (bits m)
-sliceⁱ {m = zero}  n i = lit ([] ′x)
-sliceⁱ {m = suc m} n i = sliceⁱ (suc n) i ∶ get n i
-
---- Functions
-
-Int : ∀ {n} → Function (bits n ∷ bool ∷ []) int
-Int = skip ∙return (if var 1 then uint (var 0) else sint (var 0))
-
--- arguments swapped, pred n
-SignedSatQ : ∀ n → Function (int ∷ []) (tuple 2 (bits (suc n) ∷ bool ∷ []))
-SignedSatQ n = declare (lit (true ′b)) (
-  if max <? var 1
-  then
-    var 1 ≔ max
-  else if var 1 <? min
-  then
-    var 1 ≔ min
-  else
-    var 0 ≔ lit (false ′b)
-  ∙return tup (sliceⁱ 0 (var 1) ∷ var 0 ∷ []))
-  where
-  max = lit (2 ′i) ^ n + - lit (1 ′i)
-  min = - (lit (2 ′i) ^ n)
-
--- actual shift if 'shift + 1'
-LSL-C : ∀ {n} (shift : ℕ) → Function (bits n ∷ []) (tuple 2 (bits n ∷ bit ∷ []))
-LSL-C {n} shift = declare (var 0 ∶ lit ((Vec.replicate {n = (suc shift)} false) ′x))
-  (skip ∙return tup
-    ( slice (var 0) (lit (zero ′f))
-    ∷ slice (cast eq (var 0)) (lit (Fin.inject+ shift (Fin.fromℕ n) ′f))
-    ∷ []))
-  where
-  eq = P.trans (ℕₚ.+-comm 1 (shift ℕ.+ n)) (P.cong (ℕ._+ 1) (ℕₚ.+-comm shift n))
-
---- Procedures
-
-private
-  div2 : All Fin (4 ∷ []) → Fin 2
-  div2 (zero        ∷ []) = zero
-  div2 (suc zero    ∷ []) = zero
-  div2 (suc (suc i) ∷ []) = suc zero
-
-copyMasked : Procedure (fin 8 ∷ bits 32 ∷ beat ∷ elmtMask ∷ [])
-copyMasked = for 4
-  -- 0:e 1:dest 2:result 3:beat 4:elmtMask
-  ( if hasBit (var 4) (var 0)
-    then
-      elem 8 (index (index Q (var 1)) (var 3)) (var 0) ≔ elem 8 (var 2) (var 0)
-    else skip
-  ) ∙end
-
-VPTAdvance : Procedure (beat ∷ [])
-VPTAdvance = declare (fin div2 (tup (var 0 ∷ []))) (
-  declare (elem 4 VPR-mask (var 0)) (
-    -- 0:vptState 1:maskId 2:beat
-    if var 0 ≟ lit ((true ∷ false ∷ false ∷ false ∷ []) ′x)
-    then
-      var 0 ≔ lit (Vec.replicate false ′x)
-    else if inv (var 0 ≟ lit (Vec.replicate false ′x))
-    then (
-      declare (lit ((false ∷ []) ′x)) (
-        -- 0:inv 1:vptState 2:maskId 3:beat
-        tup (var 1 ∷ var 0 ∷ []) ≔ call (LSL-C 0) (tup (var 1 ∷ [])) ∙
-        if var 0 ≟ lit ((true ∷ []) ′x)
-        then
-          elem 4 VPR-P0 (var 3) ≔ not (elem 4 VPR-P0 (var 3))
-        else skip))
-    else skip ∙
-    if get 0 (asInt (var 2)) ≟ lit ((true ∷ []) ′x)
-    then
-      elem 4 VPR-mask (var 1) ≔ var 0
-    else skip
-    ∙end))
-
-VPTActive : Function (beat ∷ []) bool
-VPTActive = skip ∙return inv (elem 4 VPR-mask (fin div2 (tup (var 0 ∷ []))) ≟ lit (Vec.replicate false ′x))
-
-GetCurInstrBeat : Function [] (tuple 2 (beat ∷ elmtMask ∷ []))
-GetCurInstrBeat = declare (lit (Vec.replicate true ′x)) (
-  -- 0:elmtMask 1:beat
-  if call VPTActive (tup (BeatId ∷ []))
-  then
-    var 0 ≔ var 0 and elem 4 VPR-P0 BeatId
-  else skip
-  ∙return tup (BeatId ∷ var 0 ∷ []))
-
--- Assumes:
---   MAX_OVERLAPPING_INSTRS = 1
---   _InstInfo[0].Valid = 1
---   BEATS_PER_TICK = 4
---   procedure argument is action of DecodeExecute
--- and more!
-ExecBeats : Procedure [] → Procedure []
-ExecBeats DecodeExec =
-  for 4 (
-    -- 0:beatId
-    BeatId ≔ var 0 ∙
-    AdvanceVPTState ≔ lit (true ′b) ∙
-    invoke DecodeExec (tup []) ∙
-    if AdvanceVPTState
-    then
-      invoke VPTAdvance (tup (var 0 ∷ []))
-    else skip)
-  ∙end
-
-from32 : ∀ size {n Γ} → Expression {n} Γ (bits 32) → Expression Γ (array (bits (toℕ (Instr.Size.esize size))) (toℕ (Instr.Size.elements size)))
-from32 Instr.8bit  = group 3
-from32 Instr.16bit = group 1
-from32 Instr.32bit = group 0
-
-to32 : ∀ size {n Γ} → Expression {n} Γ (array (bits (toℕ (Instr.Size.esize size))) (toℕ (Instr.Size.elements size))) → Expression Γ (bits 32)
-to32 Instr.8bit  = join
-to32 Instr.16bit = join
-to32 Instr.32bit = join
-
-module _ (d : Instr.VecOp₂) where
-  open Instr.VecOp₂ d
-
-  vec-op₂ : Function (bits (toℕ esize) ∷ bits (toℕ esize) ∷ []) (bits (toℕ esize)) → Procedure []
-  vec-op₂ op =
-    declare (lit (zero ′f)) (
-    declare (lit (Vec.replicate false ′x)) (
-    -- 0:elmtMask 1:curBeat
-    tup (var 1 ∷ var 0 ∷ []) ≔ call GetCurInstrBeat (tup []) ∙
-    declare (lit ((Vec.replicate false ′x) ′a)) (
-    declare (from32 size (index (index Q (lit (src₁ ′f))) (var 2))) (
-    -- 0:op₁ 1:result 2:elmtMask 3:curBeat
-    for (toℕ elements) (
-       -- 0:e 1:op₁ 2:result 3:elmtMask 4:curBeat
-      declare op₂ (
-      -- 0:op₂ 1:e 2:op₁ 3:result 4:elmtMask 5:curBeat
-      index (var 3) (var 1) ≔ call op (tup (index (var 2) (var 1) ∷ var 0 ∷ [])))) ∙
-    -- 0:op₁ 1:result 2:elmtMask 3:curBeat
-    invoke copyMasked (tup (lit (dest ′f) ∷ to32 size (var 1) ∷ var 3 ∷ var 2 ∷ []))))
-    ∙end))
-    where
-    -- 0:e 1:op₁ 2:result 3:elmtMask 4:curBeat
-    op₂ =
-      [ (λ src₂ → index (from32 size (index R (lit (src₂ ′f)))) (lit (zero ′f)))
-      , (λ src₂ → index (from32 size (index (index Q (lit (src₂ ′f))) (var 4))) (var 0))
-      ]′ src₂
-
-vadd : Instr.VAdd → Procedure []
-vadd d = vec-op₂ d (skip ∙return sliceⁱ 0 (uint (var 0) + uint (var 1)))
-
-vsub : Instr.VSub → Procedure []
-vsub d = vec-op₂ d (skip ∙return sliceⁱ 0 (uint (var 0) - uint (var 1)))
-
-vhsub : Instr.VHSub → Procedure []
-vhsub d = vec-op₂ op₂ (skip ∙return sliceⁱ 1 (toInt (var 0) - toInt (var 1)))
-  where open Instr.VHSub d; toInt = λ i → call Int (tup (i ∷ lit (unsigned ′b) ∷ []))
-
-vmul : Instr.VMul → Procedure []
-vmul d = vec-op₂ d (skip ∙return sliceⁱ 0 (sint (var 0) * sint (var 1)))
-
-vmulh : Instr.VMulH → Procedure []
-vmulh d = vec-op₂ op₂ (skip ∙return sliceⁱ (toℕ esize) (toInt (var 0) * toInt (var 1)))
-  where
-  open Instr.VMulH d; toInt = λ i → call Int (tup (i ∷ lit (unsigned ′b) ∷ []))
-
-vrmulh : Instr.VRMulH → Procedure []
-vrmulh d = vec-op₂ op₂ (skip ∙return sliceⁱ (toℕ esize) (toInt (var 0) * toInt (var 1) + lit (1 ′i) << toℕ esize-1))
-  where
-  open Instr.VRMulH d; toInt = λ i → call Int (tup (i ∷ lit (unsigned ′b) ∷ []))
-
-private
-  vqr?dmulh : Instr.VQDMulH → Function (int ∷ int ∷ []) int → Procedure []
-  vqr?dmulh d f =
-    declare (lit (zero ′f)) (
-    declare (lit (Vec.replicate false ′x)) (
-    -- 0:elmtMask 1:curBeat
-    tup (var 1 ∷ var 0 ∷ []) ≔ call GetCurInstrBeat (tup []) ∙
-    declare (lit ((Vec.replicate false ′x) ′a)) (
-    declare (from32 size (index (index Q (lit (src₁ ′f))) (var 2))) (
-    -- 0:op₁ 1:result 2:elmtMask 3:curBeat
-    for (toℕ elements) (
-       -- 0:e 1:op₁ 2:result 3:elmtMask 4:curBeat
-      declare op₂ (
-      -- 0:op₂ 1:e 2:op₁ 3:result 4:elmtMask 5:curBeat
-      declare (call f (tup (sint (index (var 2) (var 1)) ∷ sint (var 0) ∷ []))) (
-      -- 0:value 1:op₂ 2:e 3:op₁ 4:result 5:elmtMask 6:curBeat
-      declare (lit (false ′b)) (
-      -- 0:sat 1:value 2:op₂ 3:e 4:op₁ 5:result 6:elmtMask 7:curBeat
-      tup (index (var 5) (var 3) ∷ var 0 ∷ []) ≔ call (SignedSatQ (toℕ esize-1)) (tup (var 1 ∷ [])) ∙
-      if var 0 && hasBit (var 6) (fin e*esize>>3 (tup (var 3 ∷ [])))
-      then
-        FPSCR-QC ≔ lit ((true ∷ []) ′x)
-      else skip)))) ∙
-    -- 0:op₁ 1:result 2:elmtMask 3:curBeat
-    invoke copyMasked (tup (lit (dest ′f) ∷ to32 size (var 1) ∷ var 3 ∷ var 2 ∷ []))))
-    ∙end))
-      where
-      open Instr.VecOp₂ d
-      -- 0:e 1:op₁ 2:result 3:elmtMask 4:curBeat
-      op₂ =
-        [ (λ src₂ → index (from32 size (index R (lit (src₂ ′f)))) (lit (zero ′f)))
-        , (λ src₂ → index (from32 size (index (index Q (lit (src₂ ′f))) (var 4))) (var 0))
-        ]′ src₂
-
-      e*esize>>3 : All Fin (toℕ elements ∷ []) → Fin 4
-      e*esize>>3 (x ∷ []) = helper size x
-        where
-        helper : ∀ size → Fin′ (Instr.Size.elements size) → Fin 4
-        helper Instr.8bit  i = Fin.combine i (zero {0})
-        helper Instr.16bit i = Fin.combine i (zero {1})
-        helper Instr.32bit i = Fin.combine i zero
-
-vqdmulh : Instr.VQDMulH → Procedure []
-vqdmulh d = vqr?dmulh d (skip ∙return lit (2 ′i) * var 0 * var 1 >> toℕ esize)
-  where open Instr.VecOp₂ d using (esize)
-
-vqrdmulh : Instr.VQRDMulH → Procedure []
-vqrdmulh d = vqr?dmulh d (skip ∙return lit (2 ′i) * var 0 * var 1 + lit (1 ′i) << toℕ esize-1 >> toℕ esize)
-  where open Instr.VecOp₂ d using (esize; esize-1)
-- 
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