(* *************************************************************) (* *) (* The Compcert verified compiler *) (* *) (* Léo Gourdin UGA, VERIMAG *) (* *) (* Copyright VERIMAG. All rights reserved. *) (* This file is distributed under the terms of the INRIA *) (* Non-Commercial License Agreement. *) (* *) (* *************************************************************) open Camlcoq open Asmblock open Asm open Int64 open Printf (* If true, the oracle will print a msg for each applied peephole *) let debug = false (* Functions to verify the immediate offset range for ldp/stp *) let is_valid_immofs_32 z = if z <= 252 && z >= -256 && z mod 4 = 0 then true else false let is_valid_immofs_64 z = if z <= 504 && z >= -512 && z mod 8 = 0 then true else false (* Functions to check if a ldp/stp replacement is valid according to args *) let is_valid_ldr32 rd1 rd2 b1 b2 n1 n2 = let z1 = to_int (camlint64_of_coqint n1) in let z2 = to_int (camlint64_of_coqint n2) in if (not (dreg_eq rd1 rd2)) && iregsp_eq b1 b2 && (not (dreg_eq rd1 (IR b2))) && (z2 = z1 + 4 || z2 = z1 - 4) && is_valid_immofs_32 z1 then true else false let is_valid_ldr64 rd1 rd2 b1 b2 n1 n2 = let z1 = to_int (camlint64_of_coqint n1) in let z2 = to_int (camlint64_of_coqint n2) in if (not (dreg_eq rd1 rd2)) && iregsp_eq b1 b2 && (not (dreg_eq rd1 (IR b2))) && (z2 = z1 + 8 || z2 = z1 - 8) && is_valid_immofs_64 z1 then true else false let is_valid_str32 b1 b2 n1 n2 = let z1 = to_int (camlint64_of_coqint n1) in let z2 = to_int (camlint64_of_coqint n2) in if iregsp_eq b1 b2 && z2 = z1 + 4 && is_valid_immofs_32 z1 then true else false let is_valid_str64 b1 b2 n1 n2 = let z1 = to_int (camlint64_of_coqint n1) in let z2 = to_int (camlint64_of_coqint n2) in if iregsp_eq b1 b2 && z2 = z1 + 8 && is_valid_immofs_64 z1 then true else false let dreg_of_ireg r = IR (RR1 r) let dreg_of_freg r = FR r (* Return true if an intermediate * affectation eliminates the potential * candidate *) let verify_load_affect reg rd b rev = let b = IR b in if not rev then dreg_eq reg b else dreg_eq reg b || dreg_eq reg rd (* Return true if an intermediate * read eliminates the potential * candidate *) let verify_load_read reg rd b rev = dreg_eq reg rd (* Return true if an intermediate * affectation eliminates the potential * candidate *) let verify_store_affect reg rs b rev = let b = IR b in dreg_eq reg b || dreg_eq reg rs type ph_type = P32 | P32f | P64 | P64f type inst_type = Ldr of ph_type | Str of ph_type let ph_ty_to_string = function | Ldr P32 -> "ldr32" | Ldr P32f -> "ldr32f" | Ldr P64 -> "ldr64" | Ldr P64f -> "ldr64f" | Str P32 -> "str32" | Str P32f -> "str32f" | Str P64 -> "str64" | Str P64f -> "str64f" let print_ph_ty chan v = output_string chan (ph_ty_to_string v) let symb_mem = Hashtbl.create 9 (* Affect a symbolic memory list of potential replacements * for a given write in reg *) let rec affect_symb_mem reg insta pot_rep stype rev = match pot_rep with | [] -> [] | h0 :: t0 -> ( match (insta.(h0), stype) with | PLoad (PLd_rd_a (_, rd, ADimm (b, n))), Ldr _ -> if verify_load_affect reg rd b rev then affect_symb_mem reg insta t0 stype rev else h0 :: affect_symb_mem reg insta t0 stype rev | PStore (PSt_rs_a (_, rs, ADimm (b, n))), Str _ -> if verify_store_affect reg rs b rev then affect_symb_mem reg insta t0 stype rev else h0 :: affect_symb_mem reg insta t0 stype rev | _, _ -> failwith "affect_symb_mem: Found an inconsistent inst in pot_rep") (* Affect a symbolic memory list of potential replacements * for a given read in reg *) let rec read_symb_mem reg insta pot_rep stype rev = match pot_rep with | [] -> [] | h0 :: t0 -> ( match (insta.(h0), stype) with | PLoad (PLd_rd_a (_, rd, ADimm (b, n))), Ldr _ -> if verify_load_read reg rd b rev then read_symb_mem reg insta t0 stype rev else h0 :: read_symb_mem reg insta t0 stype rev | PStore (PSt_rs_a (_, rs, ADimm (b, n))), Str _ -> h0 :: read_symb_mem reg insta t0 stype rev | _, _ -> failwith "read_symb_mem: Found an inconsistent inst in pot_rep") (* Update a symbolic memory list of potential replacements * for any addressing *) let update_pot_rep_addressing a insta pot_rep stype rev = match a with | ADimm (base, _) -> pot_rep := read_symb_mem (IR base) insta !pot_rep stype rev | ADreg (base, r) -> pot_rep := read_symb_mem (IR base) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_ireg r) insta !pot_rep stype rev | ADlsl (base, r, _) -> pot_rep := read_symb_mem (IR base) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_ireg r) insta !pot_rep stype rev | ADsxt (base, r, _) -> pot_rep := read_symb_mem (IR base) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_ireg r) insta !pot_rep stype rev | ADuxt (base, r, _) -> pot_rep := read_symb_mem (IR base) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_ireg r) insta !pot_rep stype rev | ADadr (base, _, _) -> pot_rep := read_symb_mem (IR base) insta !pot_rep stype rev | ADpostincr (base, _) -> pot_rep := read_symb_mem (IR base) insta !pot_rep stype rev (* Update a symbolic memory list of potential replacements * for any basic instruction *) let update_pot_rep_basic inst insta stype rev = let pot_rep = Hashtbl.find symb_mem stype in (match inst with | PArith i -> ( match i with | PArithP (_, rd) -> pot_rep := affect_symb_mem rd insta !pot_rep stype rev | PArithPP (_, rd, rs) -> pot_rep := affect_symb_mem rd insta !pot_rep stype rev; pot_rep := read_symb_mem rs insta !pot_rep stype rev | PArithPPP (_, rd, rs1, rs2) -> pot_rep := affect_symb_mem rd insta !pot_rep stype rev; pot_rep := read_symb_mem rs1 insta !pot_rep stype rev; pot_rep := read_symb_mem rs2 insta !pot_rep stype rev | PArithRR0R (_, rd, rs1, rs2) -> pot_rep := affect_symb_mem (dreg_of_ireg rd) insta !pot_rep stype rev; (match rs1 with | RR0 rs1 -> pot_rep := read_symb_mem (dreg_of_ireg rs1) insta !pot_rep stype rev | _ -> ()); pot_rep := read_symb_mem (dreg_of_ireg rs2) insta !pot_rep stype rev | PArithRR0 (_, rd, rs) -> ( pot_rep := affect_symb_mem (dreg_of_ireg rd) insta !pot_rep stype rev; match rs with | RR0 rs1 -> pot_rep := read_symb_mem (dreg_of_ireg rs1) insta !pot_rep stype rev | _ -> ()) | PArithARRRR0 (_, rd, rs1, rs2, rs3) -> ( pot_rep := affect_symb_mem (dreg_of_ireg rd) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_ireg rs1) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_ireg rs2) insta !pot_rep stype rev; match rs3 with | RR0 rs1 -> pot_rep := read_symb_mem (dreg_of_ireg rs1) insta !pot_rep stype rev | _ -> ()) | PArithComparisonPP (_, rs1, rs2) -> pot_rep := read_symb_mem rs1 insta !pot_rep stype rev; pot_rep := read_symb_mem rs2 insta !pot_rep stype rev | PArithComparisonR0R (_, rs1, rs2) -> (match rs1 with | RR0 rs1 -> pot_rep := read_symb_mem (dreg_of_ireg rs1) insta !pot_rep stype rev | _ -> ()); pot_rep := read_symb_mem (dreg_of_ireg rs2) insta !pot_rep stype rev | PArithComparisonP (_, rs1) -> pot_rep := read_symb_mem rs1 insta !pot_rep stype rev | Pcset (rd, _) -> pot_rep := affect_symb_mem (dreg_of_ireg rd) insta !pot_rep stype rev | Pfmovi (_, rd, rs) -> ( pot_rep := affect_symb_mem (dreg_of_freg rd) insta !pot_rep stype rev; match rs with | RR0 rs -> pot_rep := read_symb_mem (dreg_of_ireg rs) insta !pot_rep stype rev | _ -> ()) | Pcsel (rd, rs1, rs2, _) -> pot_rep := affect_symb_mem rd insta !pot_rep stype rev; pot_rep := read_symb_mem rs1 insta !pot_rep stype rev; pot_rep := read_symb_mem rs2 insta !pot_rep stype rev | Pfnmul (_, rd, rs1, rs2) -> pot_rep := affect_symb_mem (dreg_of_freg rd) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_freg rs1) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_freg rs2) insta !pot_rep stype rev) | PLoad i -> ( (* Here, we consider a different behavior for load and store potential candidates: * a load does not obviously cancel the ldp candidates, but it does for any stp candidate. *) match stype with | Ldr _ -> ( match i with | PLd_rd_a (_, rd, a) -> pot_rep := affect_symb_mem rd insta !pot_rep stype rev; update_pot_rep_addressing a insta pot_rep stype rev | Pldp (_, rd1, rd2, _, _, a) -> pot_rep := affect_symb_mem rd1 insta !pot_rep stype rev; pot_rep := affect_symb_mem rd2 insta !pot_rep stype rev; update_pot_rep_addressing a insta pot_rep stype rev) | _ -> pot_rep := []) | PStore _ -> ( (* Here, we consider that a store cancel all ldp candidates, but it is far more complicated for stp ones : * if we cancel stp candidates here, we would prevent ourselves to apply the non-consec store peephole. * To solve this issue, the store candidates cleaning is managed directly in the peephole function below. *) match stype with Ldr _ -> pot_rep := [] | _ -> ()) | Pallocframe (_, _) -> pot_rep := [] | Pfreeframe (_, _) -> pot_rep := [] | Ploadsymbol (rd, _) -> pot_rep := affect_symb_mem (dreg_of_ireg rd) insta !pot_rep stype rev | Pcvtsw2x (rd, rs) -> pot_rep := affect_symb_mem (dreg_of_ireg rd) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_ireg rs) insta !pot_rep stype rev | Pcvtuw2x (rd, rs) -> pot_rep := affect_symb_mem (dreg_of_ireg rd) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_ireg rs) insta !pot_rep stype rev | Pcvtx2w rd -> pot_rep := affect_symb_mem (dreg_of_ireg rd) insta !pot_rep stype rev; pot_rep := read_symb_mem (dreg_of_ireg rd) insta !pot_rep stype rev | Pnop -> ()); Hashtbl.replace symb_mem stype pot_rep (* This is useful to manage the case were the immofs * of the first ldr/str is greater than the second one *) let min_is_rev n1 n2 = let z1 = to_int (camlint64_of_coqint n1) in let z2 = to_int (camlint64_of_coqint n2) in if z1 < z2 then true else false (* Below functions were added to merge pattern matching cases in peephole, * thanks to this, we can make the chunk difference (int/any) compatible. *) let trans_ldi (ldi : load_rd_a) : load_rd1_rd2_a = match ldi with | Pldrw | Pldrw_a -> Pldpw | Pldrx | Pldrx_a -> Pldpx | Pldrs -> Pldps | Pldrd | Pldrd_a -> Pldpd | _ -> failwith "trans_ldi: Found a non compatible load to translate" let trans_sti (sti : store_rs_a) : store_rs1_rs2_a = match sti with | Pstrw | Pstrw_a -> Pstpw | Pstrx | Pstrx_a -> Pstpx | Pstrs -> Pstps | Pstrd | Pstrd_a -> Pstpd | _ -> failwith "trans_sti: Found a non compatible store to translate" let is_compat_load (ldi : load_rd_a) = match ldi with | Pldrw | Pldrw_a | Pldrx | Pldrx_a | Pldrs | Pldrd | Pldrd_a -> true | _ -> false let are_compat_load (ldi1 : load_rd_a) (ldi2 : load_rd_a) = match ldi1 with | Pldrw | Pldrw_a -> ( match ldi2 with Pldrw | Pldrw_a -> true | _ -> false) | Pldrx | Pldrx_a -> ( match ldi2 with Pldrx | Pldrx_a -> true | _ -> false) | Pldrs -> ( match ldi2 with Pldrs -> true | _ -> false) | Pldrd | Pldrd_a -> ( match ldi2 with Pldrd | Pldrd_a -> true | _ -> false) | _ -> false let is_compat_store (sti : store_rs_a) = match sti with | Pstrw | Pstrw_a | Pstrx | Pstrx_a | Pstrs | Pstrd | Pstrd_a -> true | _ -> false let are_compat_store (sti1 : store_rs_a) (sti2 : store_rs_a) = match sti1 with | Pstrw | Pstrw_a -> ( match sti2 with Pstrw | Pstrw_a -> true | _ -> false) | Pstrx | Pstrx_a -> ( match sti2 with Pstrx | Pstrx_a -> true | _ -> false) | Pstrs -> ( match sti2 with Pstrs -> true | _ -> false) | Pstrd | Pstrd_a -> ( match sti2 with Pstrd | Pstrd_a -> true | _ -> false) | _ -> false let get_load_pht (ldi : load_rd_a) = match ldi with | Pldrw | Pldrw_a -> Ldr P32 | Pldrs -> Ldr P32f | Pldrx | Pldrx_a -> Ldr P64 | Pldrd | Pldrd_a -> Ldr P64f | _ -> failwith "get_load_string: Found a non compatible load to translate" let get_store_pht (sti : store_rs_a) = match sti with | Pstrw | Pstrw_a -> Str P32 | Pstrs -> Str P32f | Pstrx | Pstrx_a -> Str P64 | Pstrd | Pstrd_a -> Str P64f | _ -> failwith "get_store_string: Found a non compatible store to translate" let is_valid_ldr rd1 rd2 b1 b2 n1 n2 stype = match stype with | Ldr P32 | Ldr P32f -> is_valid_ldr32 rd1 rd2 b1 b2 n1 n2 | _ -> is_valid_ldr64 rd1 rd2 b1 b2 n1 n2 let is_valid_str b1 b2 n1 n2 stype = match stype with | Str P32 | Str P32f -> is_valid_str32 b1 b2 n1 n2 | _ -> is_valid_str64 b1 b2 n1 n2 (* Try to find the index of the first previous compatible * replacement in a given symbolic memory *) let rec search_compat_rep r2 b2 n2 insta pot_rep stype = match pot_rep with | [] -> None | h0 :: t0 -> ( match insta.(h0) with | PLoad (PLd_rd_a (ld1, rd1, ADimm (b1, n1))) -> if is_valid_ldr rd1 r2 b1 b2 n1 n2 stype then Some (h0, chunk_load ld1, rd1, b1, n1) else search_compat_rep r2 b2 n2 insta t0 stype | PStore (PSt_rs_a (st1, rs1, ADimm (b1, n1))) -> if is_valid_str b1 b2 n1 n2 stype then Some (h0, chunk_store st1, rs1, b1, n1) else search_compat_rep r2 b2 n2 insta t0 stype | _ -> failwith "search_compat_rep: Found an inconsistent inst in pot_rep" ) (* Try to find the index of the first previous compatible * replacement in a given symbolic memory (when iterating in the reversed list) *) let rec search_compat_rep_inv r2 b2 n2 insta pot_rep stype = match pot_rep with | [] -> None | h0 :: t0 -> ( match insta.(h0) with | PLoad (PLd_rd_a (ld1, rd1, ADimm (b1, n1))) -> if is_valid_ldr r2 rd1 b2 b1 n2 n1 stype then Some (h0, chunk_load ld1, rd1, b1, n1) else search_compat_rep_inv r2 b2 n2 insta t0 stype | PStore (PSt_rs_a (st1, rs1, ADimm (b1, n1))) -> if is_valid_str b2 b1 n2 n1 stype then Some (h0, chunk_store st1, rs1, b1, n1) else search_compat_rep_inv r2 b2 n2 insta t0 stype | _ -> failwith "search_compat_rep_ldst_inv: Found an inconsistent inst in pot_rep") let init_symb_mem () = Hashtbl.clear symb_mem; Hashtbl.add symb_mem (Ldr P32) (ref []); Hashtbl.add symb_mem (Ldr P64) (ref []); Hashtbl.add symb_mem (Ldr P32f) (ref []); Hashtbl.add symb_mem (Ldr P64f) (ref []); Hashtbl.add symb_mem (Str P32) (ref []); Hashtbl.add symb_mem (Str P64) (ref []); Hashtbl.add symb_mem (Str P32f) (ref []); Hashtbl.add symb_mem (Str P64f) (ref []) let reset_str_symb_mem () = Hashtbl.replace symb_mem (Str P32) (ref []); Hashtbl.replace symb_mem (Str P64) (ref []); Hashtbl.replace symb_mem (Str P32f) (ref []); Hashtbl.replace symb_mem (Str P64f) (ref []) (* Main peephole function in backward style *) let pair_rep_inv insta = (* Each list below is a symbolic mem representation * for one type of inst. Lists contains integers which * are the indices of insts in the main array "insta". *) init_symb_mem (); for i = Array.length insta - 1 downto 0 do let h0 = insta.(i) in (* Here we need to update every symbolic memory according to the matched inst *) update_pot_rep_basic h0 insta (Ldr P32) true; update_pot_rep_basic h0 insta (Ldr P64) true; update_pot_rep_basic h0 insta (Ldr P32f) true; update_pot_rep_basic h0 insta (Ldr P64f) true; update_pot_rep_basic h0 insta (Str P32) true; update_pot_rep_basic h0 insta (Str P64) true; update_pot_rep_basic h0 insta (Str P32f) true; update_pot_rep_basic h0 insta (Str P64f) true; match h0 with (* Non-consecutive ldr *) | PLoad (PLd_rd_a (ldi, rd1, ADimm (b1, n1))) -> if is_compat_load ldi then ( (* Search a previous compatible load *) let ld_t = get_load_pht ldi in let pot_rep = Hashtbl.find symb_mem ld_t in (match search_compat_rep_inv rd1 b1 n1 insta !pot_rep ld_t with (* If we can't find a candidate, add the current load as a potential future one *) | None -> pot_rep := i :: !pot_rep (* Else, perform the peephole *) | Some (rep, c, r, b, n) -> (* The two lines below are used to filter the elected candidate *) let filt x = x != rep in pot_rep := List.filter filt !pot_rep; insta.(rep) <- Pnop; if min_is_rev n n1 then ( if debug then eprintf "LDP_BACK_SPACED_PEEP_IMM_INC_%a\n" print_ph_ty ld_t; insta.(i) <- PLoad (Pldp (trans_ldi ldi, r, rd1, c, chunk_load ldi, ADimm (b, n)))) else ( if debug then eprintf "LDP_BACK_SPACED_PEEP_IMM_DEC_%a\n" print_ph_ty ld_t; insta.(i) <- PLoad (Pldp (trans_ldi ldi, rd1, r, chunk_load ldi, c, ADimm (b, n1))))); Hashtbl.replace symb_mem ld_t pot_rep) (* Non-consecutive str *) | PStore (PSt_rs_a (sti, rd1, ADimm (b1, n1))) -> if is_compat_store sti then ( (* Search a previous compatible store *) let st_t = get_store_pht sti in let pot_rep = Hashtbl.find symb_mem st_t in (match search_compat_rep_inv rd1 b1 n1 insta !pot_rep st_t with (* If we can't find a candidate, clean and add the current store as a potential future one *) | None -> reset_str_symb_mem (); pot_rep := [ i ] (* Else, perform the peephole *) | Some (rep, c, r, b, n) -> (* The two lines below are used to filter the elected candidate *) let filt x = x != rep in pot_rep := List.filter filt !pot_rep; insta.(rep) <- Pnop; if debug then eprintf "STP_BACK_SPACED_PEEP_IMM_INC_%a\n" print_ph_ty st_t; insta.(i) <- PStore (Pstp (trans_sti sti, rd1, r, chunk_store sti, c, ADimm (b, n1)))); Hashtbl.replace symb_mem st_t pot_rep (* Any other inst *)) else reset_str_symb_mem () | i -> ( (* Clear list of candidates if there is a non supported store *) match i with PStore _ -> reset_str_symb_mem () | _ -> ()) done (* Main peephole function in forward style *) let pair_rep insta = (* Each list below is a symbolic mem representation * for one type of inst. Lists contains integers which * are the indices of insts in the main array "insta". *) init_symb_mem (); for i = 0 to Array.length insta - 2 do let h0 = insta.(i) in let h1 = insta.(i + 1) in (* Here we need to update every symbolic memory according to the matched inst *) update_pot_rep_basic h0 insta (Ldr P32) false; update_pot_rep_basic h0 insta (Ldr P64) false; update_pot_rep_basic h0 insta (Ldr P32f) false; update_pot_rep_basic h0 insta (Ldr P64f) false; update_pot_rep_basic h0 insta (Str P32) false; update_pot_rep_basic h0 insta (Str P64) false; update_pot_rep_basic h0 insta (Str P32f) false; update_pot_rep_basic h0 insta (Str P64f) false; match (h0, h1) with (* Consecutive ldr *) | ( PLoad (PLd_rd_a (ldi1, rd1, ADimm (b1, n1))), PLoad (PLd_rd_a (ldi2, rd2, ADimm (b2, n2))) ) -> if are_compat_load ldi1 ldi2 then let ld_t = get_load_pht ldi1 in if is_valid_ldr rd1 rd2 b1 b2 n1 n2 ld_t then ( if min_is_rev n1 n2 then ( if debug then eprintf "LDP_CONSEC_PEEP_IMM_INC_%a\n" print_ph_ty ld_t; insta.(i) <- PLoad (Pldp ( trans_ldi ldi1, rd1, rd2, chunk_load ldi1, chunk_load ldi2, ADimm (b1, n1) ))) else ( if debug then eprintf "LDP_CONSEC_PEEP_IMM_DEC_%a\n" print_ph_ty ld_t; insta.(i) <- PLoad (Pldp ( trans_ldi ldi1, rd2, rd1, chunk_load ldi2, chunk_load ldi1, ADimm (b1, n2) ))); insta.(i + 1) <- Pnop) (* Non-consecutive ldr *) | PLoad (PLd_rd_a (ldi, rd1, ADimm (b1, n1))), _ -> if is_compat_load ldi then ( (* Search a previous compatible load *) let ld_t = get_load_pht ldi in let pot_rep = Hashtbl.find symb_mem ld_t in (match search_compat_rep rd1 b1 n1 insta !pot_rep ld_t with (* If we can't find a candidate, add the current load as a potential future one *) | None -> pot_rep := i :: !pot_rep (* Else, perform the peephole *) | Some (rep, c, r, b, n) -> (* The two lines below are used to filter the elected candidate *) let filt x = x != rep in pot_rep := List.filter filt !pot_rep; insta.(rep) <- Pnop; if min_is_rev n n1 then ( if debug then eprintf "LDP_FORW_SPACED_PEEP_IMM_INC_%a\n" print_ph_ty ld_t; insta.(i) <- PLoad (Pldp (trans_ldi ldi, r, rd1, c, chunk_load ldi, ADimm (b, n)))) else ( if debug then eprintf "LDP_FORW_SPACED_PEEP_IMM_DEC_%a\n" print_ph_ty ld_t; insta.(i) <- PLoad (Pldp (trans_ldi ldi, rd1, r, chunk_load ldi, c, ADimm (b, n1))))); Hashtbl.replace symb_mem ld_t pot_rep) (* Consecutive str *) | ( PStore (PSt_rs_a (sti1, rd1, ADimm (b1, n1))), PStore (PSt_rs_a (sti2, rd2, ADimm (b2, n2))) ) -> (* Regardless of whether we can perform the peephole or not, * we have to clean the potential candidates for stp now as we are * looking at two new store instructions. *) reset_str_symb_mem (); if are_compat_store sti1 sti2 then let st_t = get_store_pht sti1 in if is_valid_str b1 b2 n1 n2 st_t then ( if debug then eprintf "STP_CONSEC_PEEP_IMM_INC_%a\n" print_ph_ty st_t; insta.(i) <- PStore (Pstp ( trans_sti sti1, rd1, rd2, chunk_store sti1, chunk_store sti2, ADimm (b1, n1) )); insta.(i + 1) <- Pnop) (* Non-consecutive str *) | PStore (PSt_rs_a (sti, rd1, ADimm (b1, n1))), _ -> if is_compat_store sti then ( (* Search a previous compatible store *) let st_t = get_store_pht sti in let pot_rep = Hashtbl.find symb_mem st_t in (match search_compat_rep rd1 b1 n1 insta !pot_rep st_t with (* If we can't find a candidate, clean and add the current store as a potential future one *) | None -> reset_str_symb_mem (); pot_rep := [ i ] (* Else, perform the peephole *) | Some (rep, c, r, b, n) -> (* The two lines below are used to filter the elected candidate *) let filt x = x != rep in pot_rep := List.filter filt !pot_rep; insta.(rep) <- Pnop; if debug then eprintf "STP_FORW_SPACED_PEEP_IMM_INC_%a\n" print_ph_ty st_t; insta.(i) <- PStore (Pstp (trans_sti sti, r, rd1, c, chunk_store sti, ADimm (b, n)))); Hashtbl.replace symb_mem st_t pot_rep) else reset_str_symb_mem () (* Any other inst *) | i, _ -> ( (* Clear list of candidates if there is a non supported store *) match i with PStore _ -> reset_str_symb_mem () | _ -> ()) done (* Calling peephole if flag is set *) let optimize_bdy (bdy : basic list) : basic list = if !Clflags.option_fcoalesce_mem then ( let insta = Array.of_list bdy in pair_rep insta; pair_rep_inv insta; Array.to_list insta) else bdy (* Called peephole function from Coq *) let peephole_opt bdy = Timing.time_coq [ 'P'; 'e'; 'e'; 'p'; 'h'; 'o'; 'l'; 'e'; ' '; 'o'; 'r'; 'a'; 'c'; 'l'; 'e'; ] optimize_bdy bdy