+/* Expand vector widening operations.
+
+ There are two different classes of operations handled here:
+ 1) Operations whose result is wider than all the arguments to the operation.
+ Examples: VEC_UNPACK_HI/LO_EXPR, VEC_WIDEN_MULT_HI/LO_EXPR
+ In this case OP0 and optionally OP1 would be initialized,
+ but WIDE_OP wouldn't (not relevant for this case).
+ 2) Operations whose result is of the same size as the last argument to the
+ operation, but wider than all the other arguments to the operation.
+ Examples: WIDEN_SUM_EXPR, VEC_DOT_PROD_EXPR.
+ In the case WIDE_OP, OP0 and optionally OP1 would be initialized.
+
+ E.g, when called to expand the following operations, this is how
+ the arguments will be initialized:
+ nops OP0 OP1 WIDE_OP
+ widening-sum 2 oprnd0 - oprnd1
+ widening-dot-product 3 oprnd0 oprnd1 oprnd2
+ widening-mult 2 oprnd0 oprnd1 -
+ type-promotion (vec-unpack) 1 oprnd0 - - */
+
+rtx
+expand_widen_pattern_expr (tree exp, rtx op0, rtx op1, rtx wide_op, rtx target,
+ int unsignedp)
+{
+ tree oprnd0, oprnd1, oprnd2;
+ enum machine_mode wmode = 0, tmode0, tmode1 = 0;
+ optab widen_pattern_optab;
+ int icode;
+ enum machine_mode xmode0, xmode1 = 0, wxmode = 0;
+ rtx temp;
+ rtx pat;
+ rtx xop0, xop1, wxop;
+ int nops = TREE_OPERAND_LENGTH (exp);
+
+ oprnd0 = TREE_OPERAND (exp, 0);
+ tmode0 = TYPE_MODE (TREE_TYPE (oprnd0));
+ widen_pattern_optab =
+ optab_for_tree_code (TREE_CODE (exp), TREE_TYPE (oprnd0));
+ icode = (int) widen_pattern_optab->handlers[(int) tmode0].insn_code;
+ gcc_assert (icode != CODE_FOR_nothing);
+ xmode0 = insn_data[icode].operand[1].mode;
+
+ if (nops >= 2)
+ {
+ oprnd1 = TREE_OPERAND (exp, 1);
+ tmode1 = TYPE_MODE (TREE_TYPE (oprnd1));
+ xmode1 = insn_data[icode].operand[2].mode;
+ }
+
+ /* The last operand is of a wider mode than the rest of the operands. */
+ if (nops == 2)
+ {
+ wmode = tmode1;
+ wxmode = xmode1;
+ }
+ else if (nops == 3)
+ {
+ gcc_assert (tmode1 == tmode0);
+ gcc_assert (op1);
+ oprnd2 = TREE_OPERAND (exp, 2);
+ wmode = TYPE_MODE (TREE_TYPE (oprnd2));
+ wxmode = insn_data[icode].operand[3].mode;
+ }
+
+ if (!wide_op)
+ wmode = wxmode = insn_data[icode].operand[0].mode;
+
+ if (!target
+ || ! (*insn_data[icode].operand[0].predicate) (target, wmode))
+ temp = gen_reg_rtx (wmode);
+ else
+ temp = target;
+
+ xop0 = op0;
+ xop1 = op1;
+ wxop = wide_op;
+
+ /* In case the insn wants input operands in modes different from
+ those of the actual operands, convert the operands. It would
+ seem that we don't need to convert CONST_INTs, but we do, so
+ that they're properly zero-extended, sign-extended or truncated
+ for their mode. */
+
+ if (GET_MODE (op0) != xmode0 && xmode0 != VOIDmode)
+ xop0 = convert_modes (xmode0,
+ GET_MODE (op0) != VOIDmode
+ ? GET_MODE (op0)
+ : tmode0,
+ xop0, unsignedp);
+
+ if (op1)
+ if (GET_MODE (op1) != xmode1 && xmode1 != VOIDmode)
+ xop1 = convert_modes (xmode1,
+ GET_MODE (op1) != VOIDmode
+ ? GET_MODE (op1)
+ : tmode1,
+ xop1, unsignedp);
+
+ if (wide_op)
+ if (GET_MODE (wide_op) != wxmode && wxmode != VOIDmode)
+ wxop = convert_modes (wxmode,
+ GET_MODE (wide_op) != VOIDmode
+ ? GET_MODE (wide_op)
+ : wmode,
+ wxop, unsignedp);
+
+ /* Now, if insn's predicates don't allow our operands, put them into
+ pseudo regs. */
+
+ if (! (*insn_data[icode].operand[1].predicate) (xop0, xmode0)
+ && xmode0 != VOIDmode)
+ xop0 = copy_to_mode_reg (xmode0, xop0);
+
+ if (op1)
+ {
+ if (! (*insn_data[icode].operand[2].predicate) (xop1, xmode1)
+ && xmode1 != VOIDmode)
+ xop1 = copy_to_mode_reg (xmode1, xop1);
+
+ if (wide_op)
+ {
+ if (! (*insn_data[icode].operand[3].predicate) (wxop, wxmode)
+ && wxmode != VOIDmode)
+ wxop = copy_to_mode_reg (wxmode, wxop);
+
+ pat = GEN_FCN (icode) (temp, xop0, xop1, wxop);
+ }
+ else
+ pat = GEN_FCN (icode) (temp, xop0, xop1);
+ }
+ else
+ {
+ if (wide_op)
+ {
+ if (! (*insn_data[icode].operand[2].predicate) (wxop, wxmode)
+ && wxmode != VOIDmode)
+ wxop = copy_to_mode_reg (wxmode, wxop);
+
+ pat = GEN_FCN (icode) (temp, xop0, wxop);
+ }
+ else
+ pat = GEN_FCN (icode) (temp, xop0);
+ }
+
+ emit_insn (pat);
+ return temp;
+}
+
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