/* Medium-level subroutines: convert bit-field store and extract
and shifts, multiplies and divides to rtl instructions.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+ Free Software Foundation, Inc.
This file is part of GCC.
meaningful at a much higher level; when structures are copied
between memory and regs, the higher-numbered regs
always get higher addresses. */
- bitnum += SUBREG_BYTE (op0) * BITS_PER_UNIT;
+ int inner_mode_size = GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0)));
+ int outer_mode_size = GET_MODE_SIZE (GET_MODE (op0));
+
+ byte_offset = 0;
+
+ /* Paradoxical subregs need special handling on big endian machines. */
+ if (SUBREG_BYTE (op0) == 0 && inner_mode_size < outer_mode_size)
+ {
+ int difference = inner_mode_size - outer_mode_size;
+
+ if (WORDS_BIG_ENDIAN)
+ byte_offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD;
+ if (BYTES_BIG_ENDIAN)
+ byte_offset += difference % UNITS_PER_WORD;
+ }
+ else
+ byte_offset = SUBREG_BYTE (op0);
+
+ bitnum += byte_offset * BITS_PER_UNIT;
op0 = SUBREG_REG (op0);
}
&& bitsize > 0
&& GET_MODE_BITSIZE (op_mode) >= bitsize
&& ! ((REG_P (op0) || GET_CODE (op0) == SUBREG)
- && (bitsize + bitpos > GET_MODE_BITSIZE (op_mode))))
+ && (bitsize + bitpos > GET_MODE_BITSIZE (op_mode)))
+ && insn_data[CODE_FOR_insv].operand[1].predicate (GEN_INT (bitsize),
+ VOIDmode))
{
int xbitpos = bitpos;
rtx value1;
if (! all_one)
{
- temp = expand_binop (mode, and_optab, op0,
+ /* Don't try and keep the intermediate in memory, if we need to
+ perform both a bit-wise AND and a bit-wise IOR (except when
+ we're optimizing for size). */
+ if (MEM_P (subtarget) && !all_zero && !optimize_size)
+ subtarget = force_reg (mode, subtarget);
+ temp = expand_binop (mode, and_optab, subtarget,
mask_rtx (mode, bitpos, bitsize, 1),
subtarget, 1, OPTAB_LIB_WIDEN);
subtarget = temp;
return t;
}
}
-
-/* Return an rtx representing the value of X * MULT + ADD.
- TARGET is a suggestion for where to store the result (an rtx).
- MODE is the machine mode for the computation.
- X and MULT must have mode MODE. ADD may have a different mode.
- So can X (defaults to same as MODE).
- UNSIGNEDP is nonzero to do unsigned multiplication.
- This may emit insns. */
-
-rtx
-expand_mult_add (rtx x, rtx target, rtx mult, rtx add, enum machine_mode mode,
- int unsignedp)
-{
- tree type = lang_hooks.types.type_for_mode (mode, unsignedp);
- tree add_type = (GET_MODE (add) == VOIDmode
- ? type: lang_hooks.types.type_for_mode (GET_MODE (add),
- unsignedp));
- tree result = fold_build2 (PLUS_EXPR, type,
- fold_build2 (MULT_EXPR, type,
- make_tree (type, x),
- make_tree (type, mult)),
- make_tree (add_type, add));
-
- return expand_expr (result, target, VOIDmode, 0);
-}
\f
/* Compute the logical-and of OP0 and OP1, storing it in TARGET
and returning TARGET.
}
\f
/* Perform possibly multi-word comparison and conditional jump to LABEL
- if ARG1 OP ARG2 true where ARG1 and ARG2 are of mode MODE
-
- The algorithm is based on the code in expr.c:do_jump.
-
- Note that this does not perform a general comparison. Only
- variants generated within expmed.c are correctly handled, others
- could be handled if needed. */
+ if ARG1 OP ARG2 true where ARG1 and ARG2 are of mode MODE. This is
+ now a thin wrapper around do_compare_rtx_and_jump. */
static void
do_cmp_and_jump (rtx arg1, rtx arg2, enum rtx_code op, enum machine_mode mode,
rtx label)
{
- /* If this mode is an integer too wide to compare properly,
- compare word by word. Rely on cse to optimize constant cases. */
-
- if (GET_MODE_CLASS (mode) == MODE_INT
- && ! can_compare_p (op, mode, ccp_jump))
- {
- rtx label2 = gen_label_rtx ();
-
- switch (op)
- {
- case LTU:
- do_jump_by_parts_greater_rtx (mode, 1, arg2, arg1, label2, label);
- break;
-
- case LEU:
- do_jump_by_parts_greater_rtx (mode, 1, arg1, arg2, label, label2);
- break;
-
- case LT:
- do_jump_by_parts_greater_rtx (mode, 0, arg2, arg1, label2, label);
- break;
-
- case GT:
- do_jump_by_parts_greater_rtx (mode, 0, arg1, arg2, label2, label);
- break;
-
- case GE:
- do_jump_by_parts_greater_rtx (mode, 0, arg2, arg1, label, label2);
- break;
-
- /* do_jump_by_parts_equality_rtx compares with zero. Luckily
- that's the only equality operations we do */
- case EQ:
- gcc_assert (arg2 == const0_rtx && mode == GET_MODE(arg1));
- do_jump_by_parts_equality_rtx (arg1, label2, label);
- break;
-
- case NE:
- gcc_assert (arg2 == const0_rtx && mode == GET_MODE(arg1));
- do_jump_by_parts_equality_rtx (arg1, label, label2);
- break;
-
- default:
- gcc_unreachable ();
- }
-
- emit_label (label2);
- }
- else
- emit_cmp_and_jump_insns (arg1, arg2, op, NULL_RTX, mode, 0, label);
+ int unsignedp = (op == LTU || op == LEU || op == GTU || op == GEU);
+ do_compare_rtx_and_jump (arg1, arg2, op, unsignedp, mode,
+ NULL_RTX, NULL_RTX, label);
}
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