On Thu, 2021-06-17 at 10:19 -0500, Bill Schmidt via Gcc-patches wrote:
> 2021-03-24  Bill Schmidt  <wschm...@linux.ibm.com>
> 
> gcc/
>       * config/rs6000/rs6000-call.c (new_htm_spr_num): New function.
>       (new_htm_expand_builtin): Implement.
>       (rs6000_expand_new_builtin): Handle 32-bit and endian cases.
> ---
>  gcc/config/rs6000/rs6000-call.c | 202 ++++++++++++++++++++++++++++++++
>  1 file changed, 202 insertions(+)
> 
> diff --git a/gcc/config/rs6000/rs6000-call.c b/gcc/config/rs6000/rs6000-call.c
> index e1b685fb874..6b60f0852ef 100644
> --- a/gcc/config/rs6000/rs6000-call.c
> +++ b/gcc/config/rs6000/rs6000-call.c
> @@ -15068,11 +15068,171 @@ new_mma_expand_builtin (tree exp, rtx target, 
> insn_code icode,
>    return target;
>  }
> 
> +/* Return the appropriate SPR number associated with the given builtin.  */
> +static inline HOST_WIDE_INT
> +new_htm_spr_num (enum rs6000_gen_builtins code)
> +{
> +  if (code == RS6000_BIF_GET_TFHAR
> +      || code == RS6000_BIF_SET_TFHAR)
> +    return TFHAR_SPR;
> +  else if (code == RS6000_BIF_GET_TFIAR
> +        || code == RS6000_BIF_SET_TFIAR)
> +    return TFIAR_SPR;
> +  else if (code == RS6000_BIF_GET_TEXASR
> +        || code == RS6000_BIF_SET_TEXASR)
> +    return TEXASR_SPR;
> +  gcc_assert (code == RS6000_BIF_GET_TEXASRU
> +           || code == RS6000_BIF_SET_TEXASRU);
> +  return TEXASRU_SPR;
> +}

Ok,


> +
>  /* Expand the HTM builtin in EXP and store the result in TARGET.  */
>  static rtx
>  new_htm_expand_builtin (bifdata *bifaddr, rs6000_gen_builtins fcode,
>                       tree exp, rtx target)
>  {
> +  tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0);
> +  bool nonvoid = TREE_TYPE (TREE_TYPE (fndecl)) != void_type_node;
> +
> +  if (!TARGET_POWERPC64
> +      && (fcode == RS6000_BIF_TABORTDC
> +       || fcode == RS6000_BIF_TABORTDCI))
> +    {
> +      error ("builtin %qs is only valid in 64-bit mode", bifaddr->bifname);
> +      return const0_rtx;
> +    }
ok

> +
> +  rtx op[MAX_HTM_OPERANDS], pat;
> +  int nopnds = 0;
> +  tree arg;
> +  call_expr_arg_iterator iter;
> +  insn_code icode = bifaddr->icode;
> +  bool uses_spr = bif_is_htmspr (*bifaddr);
> +  rtx cr = NULL_RTX;
> +
> +  if (uses_spr)
> +    icode = rs6000_htm_spr_icode (nonvoid);
> +  const insn_operand_data *insn_op = &insn_data[icode].operand[0];
> +
> +  if (nonvoid)
> +    {
> +      machine_mode tmode = (uses_spr) ? insn_op->mode : E_SImode;
> +      if (!target
> +       || GET_MODE (target) != tmode
> +       || (uses_spr && !(*insn_op->predicate) (target, tmode)))
> +     target = gen_reg_rtx (tmode);
> +      if (uses_spr)
> +     op[nopnds++] = target;
> +    }
> +
> +  FOR_EACH_CALL_EXPR_ARG (arg, iter, exp)
> +    {
> +      if (arg == error_mark_node || nopnds >= MAX_HTM_OPERANDS)
> +     return const0_rtx;
> +
> +      insn_op = &insn_data[icode].operand[nopnds];
> +      op[nopnds] = expand_normal (arg);
> +
> +      if (!(*insn_op->predicate) (op[nopnds], insn_op->mode))
> +     {
> +       if (!strcmp (insn_op->constraint, "n"))
> +         {
> +           int arg_num = (nonvoid) ? nopnds : nopnds + 1;
> +           if (!CONST_INT_P (op[nopnds]))
> +             error ("argument %d must be an unsigned literal", arg_num);
> +           else
> +             error ("argument %d is an unsigned literal that is "
> +                    "out of range", arg_num);
> +           return const0_rtx;
> +         }
> +       op[nopnds] = copy_to_mode_reg (insn_op->mode, op[nopnds]);
> +     }
> +
> +      nopnds++;
> +    }
> +
> +  /* Handle the builtins for extended mnemonics.  These accept
> +     no arguments, but map to builtins that take arguments.  */
> +  switch (fcode)
> +    {
> +    case RS6000_BIF_TENDALL:  /* Alias for: tend. 1  */
> +    case RS6000_BIF_TRESUME:  /* Alias for: tsr. 1  */
> +      op[nopnds++] = GEN_INT (1);
> +      break;
> +    case RS6000_BIF_TSUSPEND: /* Alias for: tsr. 0  */
> +      op[nopnds++] = GEN_INT (0);
> +      break;
> +    default:
> +      break;
> +    }

ok

> +
> +  /* If this builtin accesses SPRs, then pass in the appropriate
> +     SPR number and SPR regno as the last two operands.  */
> +  if (uses_spr)
> +    {
> +      machine_mode mode = (TARGET_POWERPC64) ? DImode : SImode;
> +      op[nopnds++] = gen_rtx_CONST_INT (mode, new_htm_spr_num (fcode));
> +    }
> +  /* If this builtin accesses a CR, then pass in a scratch
> +     CR as the last operand.  */
> +  else if (bif_is_htmcr (*bifaddr))

Given this is an if/else, presumably there are no builtins that use
both a SPR and access a CR ?

> +    {
> +      cr = gen_reg_rtx (CCmode);
> +      op[nopnds++] = cr;
> +    }
> +
> +  switch (nopnds)
> +    {
> +    case 1:
> +      pat = GEN_FCN (icode) (op[0]);
> +      break;
> +    case 2:
> +      pat = GEN_FCN (icode) (op[0], op[1]);
> +      break;
> +    case 3:
> +      pat = GEN_FCN (icode) (op[0], op[1], op[2]);
> +      break;
> +    case 4:
> +      pat = GEN_FCN (icode) (op[0], op[1], op[2], op[3]);
> +      break;
> +    default:
> +      gcc_unreachable ();
> +    }
> +  if (!pat)
> +    return NULL_RTX;
> +  emit_insn (pat);

ok

> +
> +  if (bif_is_htmcr (*bifaddr))
> +    {
> +      if (fcode == RS6000_BIF_TBEGIN)
> +     {
> +       /* Emit code to set TARGET to true or false depending on
> +          whether the tbegin. instruction successfully or failed
> +          to start a transaction.  We do this by placing the 1's
> +          complement of CR's EQ bit into TARGET.  */

s/successfully/succeeded/ ?


> +       rtx scratch = gen_reg_rtx (SImode);
> +       emit_insn (gen_rtx_SET (scratch,
> +                               gen_rtx_EQ (SImode, cr,
> +                                           const0_rtx)));
> +       emit_insn (gen_rtx_SET (target,
> +                               gen_rtx_XOR (SImode, scratch,
> +                                            GEN_INT (1))));
> +     }
> +      else
> +     {
> +       /* Emit code to copy the 4-bit condition register field
> +          CR into the least significant end of register TARGET.  */
> +       rtx scratch1 = gen_reg_rtx (SImode);
> +       rtx scratch2 = gen_reg_rtx (SImode);
> +       rtx subreg = simplify_gen_subreg (CCmode, scratch1, SImode, 0);
> +       emit_insn (gen_movcc (subreg, cr));
> +       emit_insn (gen_lshrsi3 (scratch2, scratch1, GEN_INT (28)));
> +       emit_insn (gen_andsi3 (target, scratch2, GEN_INT (0xf)));
> +     }
> +    }
> +
> +  if (nonvoid)
> +    return target;

ok

>    return const0_rtx;
>  }
> 
> @@ -15316,6 +15476,48 @@ rs6000_expand_new_builtin (tree exp, rtx target,
>    if (bif_is_htm (*bifaddr))
>      return new_htm_expand_builtin (bifaddr, fcode, exp, target);
> 
> +  if (bif_is_32bit (*bifaddr) && TARGET_32BIT)
> +    {
> +      if (fcode == RS6000_BIF_MFTB)
> +     icode = CODE_FOR_rs6000_mftb_si;
> +      else
> +     gcc_unreachable ();
> +    }

ok

> +
> +  if (bif_is_endian (*bifaddr) && BYTES_BIG_ENDIAN)
> +    {
> +      if (fcode == RS6000_BIF_LD_ELEMREV_V1TI)
> +     icode = CODE_FOR_vsx_load_v1ti;
> +      else if (fcode == RS6000_BIF_LD_ELEMREV_V2DF)
> +     icode = CODE_FOR_vsx_load_v2df;
> +      else if (fcode == RS6000_BIF_LD_ELEMREV_V2DI)
> +     icode = CODE_FOR_vsx_load_v2di;
> +      else if (fcode == RS6000_BIF_LD_ELEMREV_V4SF)
> +     icode = CODE_FOR_vsx_load_v4sf;
> +      else if (fcode == RS6000_BIF_LD_ELEMREV_V4SI)
> +     icode = CODE_FOR_vsx_load_v4si;
> +      else if (fcode == RS6000_BIF_LD_ELEMREV_V8HI)
> +     icode = CODE_FOR_vsx_load_v8hi;
> +      else if (fcode == RS6000_BIF_LD_ELEMREV_V16QI)
> +     icode = CODE_FOR_vsx_load_v16qi;
> +      else if (fcode == RS6000_BIF_ST_ELEMREV_V1TI)
> +     icode = CODE_FOR_vsx_store_v1ti;
> +      else if (fcode == RS6000_BIF_ST_ELEMREV_V2DF)
> +     icode = CODE_FOR_vsx_store_v2df;
> +      else if (fcode == RS6000_BIF_ST_ELEMREV_V2DI)
> +     icode = CODE_FOR_vsx_store_v2di;
> +      else if (fcode == RS6000_BIF_ST_ELEMREV_V4SF)
> +     icode = CODE_FOR_vsx_store_v4sf;
> +      else if (fcode == RS6000_BIF_ST_ELEMREV_V4SI)
> +     icode = CODE_FOR_vsx_store_v4si;
> +      else if (fcode == RS6000_BIF_ST_ELEMREV_V8HI)
> +     icode = CODE_FOR_vsx_store_v8hi;
> +      else if (fcode == RS6000_BIF_ST_ELEMREV_V16QI)
> +     icode = CODE_FOR_vsx_store_v16qi;
> +      else
> +     gcc_unreachable ();

ok
lgtm,
thanks
-Will

> +    }
> +
>    rtx pat;
>    const int MAX_BUILTIN_ARGS = 6;
>    tree arg[MAX_BUILTIN_ARGS];

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