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|
(* *********************************************************************)
(* *)
(* The Compcert verified compiler *)
(* *)
(* Xavier Leroy, INRIA Paris-Rocquencourt *)
(* *)
(* Copyright Institut National de Recherche en Informatique et en *)
(* Automatique. All rights reserved. This file is distributed *)
(* under the terms of the INRIA Non-Commercial License Agreement. *)
(* *)
(* *********************************************************************)
(* Expanding built-ins and some pseudo-instructions by rewriting
of the IA32 assembly code. Currently not done, this expansion
is performed on the fly in PrintAsm. *)
open Asm
open Asmexpandaux
open AST
open Camlcoq
(* Useful constants and helper functions *)
let _0 = Integers.Int.zero
(* Handling of compiler-inlined builtins *)
let emit_builtin_inline oc name args res =
match name, args, res with
(* Integer arithmetic *)
| ("__builtin_bswap"| "__builtin_bswap32"), [IR a1], [IR res] ->
if a1 <> res then
emit (Pmov_rr (res,a1));
emit (Pbswap res)
| "__builtin_bswap16", [IR a1], [IR res] ->
if a1 <> res then
emit (Pmov_rr (res,a1));
emit (Prolw_8 res)
| "__builtin_clz", [IR a1], [IR res] ->
emit (Pbslr (a1,res));
emit (Pxor_ri(res,coqint_of_camlint 31l))
| "__builtin_ctz", [IR a1], [IR res] ->
emit (Pbsfl (a1,res))
(* Float arithmetic *)
| "__builtin_fabs", [FR a1], [FR res] ->
if a1 <> res then
emit (Pmovsd_ff (a1,res));
emit (Pabsd res) (* This ensures that need_masks is set to true *)
| "__builtin_fsqrt", [FR a1], [FR res] ->
emit (Psqrtsd (a1,res))
| "__builtin_fmax", [FR a1; FR a2], [FR res] ->
if res = a1 then
emit (Pmaxsd (a2,res))
else if res = a2 then
emit (Pmaxsd (a1,res))
else begin
emit (Pmovsd_ff (a1,res));
emit (Pmaxsd (a2,res))
end
| "__builtin_fmin", [FR a1; FR a2], [FR res] ->
if res = a1 then
emit (Pminsd (a2,res))
else if res = a2 then
emit (Pminsd (a1,res))
else begin
emit (Pmovsd_ff (a1,res));
emit (Pminsd (a2,res))
end
| "__builtin_fmadd", [FR a1; FR a2; FR a3], [FR res] ->
if res = a1 then
emit (Pfmadd132 (a2,a3,res))
else if res = a2 then
emit (Pfmadd213 (a2,a3,res))
else if res = a3 then
emit (Pfmadd231 (a2,a3,res))
else begin
emit (Pmovsd_ff (a2,res));
emit (Pfmadd231 (a1,a2,res))
end
|"__builtin_fmsub", [FR a1; FR a2; FR a3], [FR res] ->
if res = a1 then
emit (Pfmsub132 (a2,a3,res))
else if res = a2 then
emit (Pfmsub213 (a2,a3,res))
else if res = a3 then
emit (Pfmsub231 (a2,a3,res))
else begin
emit (Pmovsd_ff (a2,res));
emit (Pfmsub231 (a1,a2,res))
end
| "__builtin_fnmadd", [FR a1; FR a2; FR a3], [FR res] ->
if res = a1 then
emit (Pfnmadd132 (a2,a3,res))
else if res = a2 then
emit (Pfnmadd213 (a2,a3,res))
else if res = a3 then
emit (Pfnmadd231 (a2,a3,res))
else begin
emit (Pmovsd_ff (a2,res));
emit (Pfnmadd231 (a1,a2,res))
end
|"__builtin_fnmsub", [FR a1; FR a2; FR a3], [FR res] ->
if res = a1 then
emit (Pfnmsub132 (a2,a3,res))
else if res = a2 then
emit (Pfnmsub213 (a2,a3,res))
else if res = a3 then
emit (Pfnmsub231 (a2,a3,res))
else begin
emit (Pmovsd_ff (a2,res));
emit (Pfnmsub231 (a1,a2,res))
end
(* 64-bit integer arithmetic *)
| "__builtin_negl", [IR ah; IR al], [IR rh; IR rl] ->
assert (ah = EDX && al = EAX && rh = EDX && rl = EAX);
emit (Pneg EAX);
emit (Padcl_ir (_0,EDX));
emit (Pneg EDX)
| "__builtin_addl", [IR ah; IR al; IR bh; IR bl], [IR rh; IR rl] ->
assert (ah = EDX && al = EAX && bh = ECX && bl = EBX && rh = EDX && rl = EAX);
emit (Paddl (EBX,EAX));
emit (Padcl_rr (ECX,EDX))
| "__builtin_subl", [IR ah; IR al; IR bh; IR bl], [IR rh; IR rl] ->
assert (ah = EDX && al = EAX && bh = ECX && bl = EBX && rh = EDX && rl = EAX);
emit (Psub_rr (EBX,EAX));
emit (Psbbl (ECX,EDX))
| "__builtin_mull", [IR a; IR b], [IR rh; IR rl] ->
assert (a = EAX && b = EDX && rh = EDX && rl = EAX);
emit (Pmul_r EDX)
(* Memory accesses *)
(* | "__builtin_read16_reversed", [IR a1], [IR res] ->
fprintf oc " movzwl 0(%a), %a\n" ireg a1 ireg res;
fprintf oc " rolw $8, %a\n" ireg16 res
| "__builtin_read32_reversed", [IR a1], [IR res] ->
fprintf oc " movl 0(%a), %a\n" ireg a1 ireg res;
fprintf oc " bswap %a\n" ireg res
| "__builtin_write16_reversed", [IR a1; IR a2], _ ->
let tmp = if a1 = ECX then EDX else ECX in
if a2 <> tmp then
emit (Pmov_rr (a2,tmp));
fprintf oc " xchg %a, %a\n" ireg8 tmp high_ireg8 tmp;
fprintf oc " movw %a, 0(%a)\n" ireg16 tmp ireg a1
| "__builtin_write32_reversed", [IR a1; IR a2], _ ->
let tmp = if a1 = ECX then EDX else ECX in
if a2 <> tmp then
emit (Pmov_rr (a2,tmp));
emit (Pbswap res);
fprintf oc " movl %a, 0(%a)\n" ireg tmp ireg a1
(* Synchronization *)
| "__builtin_membar", [], _ ->
()
(* Vararg stuff *)
| "__builtin_va_start", [IR a], _ ->
print_builtin_va_start oc a
(* Catch-all *) *)
| _ ->
invalid_arg ("unrecognized builtin " ^ name)
let expand_instruction instr =
match instr with
| _ -> emit instr
let expand_program p = p
let expand_function fn =
set_current_function fn;
List.iter expand_instruction fn.fn_code;
get_current_function ()
let expand_fundef = function
| Internal f -> Internal (expand_function f)
| External ef -> External ef
let expand_program (p: Asm.program) : Asm.program =
AST.transform_program expand_fundef p
|
