c4x.c (legitimize_operands): Use rtx_cost to determine if it is worthwhile forcing a constant into a register.
* config/c4x/c4x.c (legitimize_operands): Use rtx_cost to determine if it is worthwhile forcing a constant into a register. * config/c4x/c4x.h (CONST_COSTS): An integer value of 255 or 65535 used with a logical and or an integer value of 16 or 24 used with a right shift has zero cost on the C40. From-SVN: r26529
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@ -1,3 +1,11 @@
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Sun Apr 18 17:24:10 1999 Michael Hayes <m.hayes@elec.canterbury.ac.nz>
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* config/c4x/c4x.c (legitimize_operands): Use rtx_cost
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to determine if it is worthwhile forcing a constant into a register.
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* config/c4x/c4x.h (CONST_COSTS): An integer value of 255 or 65535
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used with a logical and or an integer value of 16 or 24 used with
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a right shift has zero cost on the C40.
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Sat Apr 17 21:30:11 1999 Bernd Schmidt <crux@pool.informatik.rwth-aachen.de>
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* gcse.c (compute_local_properties): If setp is nonzero, clear
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@ -3582,6 +3582,11 @@ c4x_valid_operands (code, operands, mode, force)
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/* Any valid memory operand screened by src_operand is OK. */
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case MEM:
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#if 0
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if (code2 != REG)
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return 0;
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#endif
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break;
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/* After CSE, any remaining (ADDRESSOF:P reg) gets converted
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into a stack slot memory address comprising a PLUS and a
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@ -3644,10 +3649,9 @@ legitimize_operands (code, operands, mode)
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if (! reload_in_progress
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&& TARGET_HOIST
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&& optimize > 0
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&& ((GET_CODE (operands[1]) == CONST_INT
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&& ! c4x_J_constant (operands[1])
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&& INTVAL (operands[1]) != 0)
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|| GET_CODE (operands[1]) == CONST_DOUBLE))
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&& GET_CODE (operands[1]) == CONST_INT
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&& preserve_subexpressions_p ()
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&& rtx_cost (operands[1], code) > 1)
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operands[1] = force_reg (mode, operands[1]);
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if (! reload_in_progress
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@ -3661,11 +3665,11 @@ legitimize_operands (code, operands, mode)
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opportunities. */
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if (! reload_in_progress
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&& ! ((code == PLUS || code == MINUS) && mode == Pmode)
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&& (TARGET_HOIST && optimize > 1
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&& ((GET_CODE (operands[2]) == CONST_INT
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&& ! c4x_J_constant (operands[2])
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&& INTVAL (operands[2]) != 0)
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|| GET_CODE (operands[2]) == CONST_DOUBLE)))
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&& TARGET_HOIST
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&& optimize > 1
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&& GET_CODE (operands[2]) == CONST_INT
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&& preserve_subexpressions_p ()
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&& rtx_cost (operands[2], code) > 1)
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operands[2] = force_reg (mode, operands[2]);
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/* We can get better code on a C30 if we force constant shift counts
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@ -1763,7 +1763,13 @@ extern void c4x_encode_section_info ();
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Some small integers are effectively free for the C40. We should
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also consider if we are using the small memory model. With
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the big memory model we require an extra insn for a constant
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loaded from memory. */
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loaded from memory.
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This is used by expand_binop to decide whether to force a constant
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into a register. If the cost is greater than 2 and the constant
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is used within a short loop, it gets forced into a register.
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Ideally, there should be some weighting as to how mnay times it is used
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within the loop. */
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#define SHIFT_CODE_P(C) ((C) == ASHIFT || (C) == ASHIFTRT || (C) == LSHIFTRT)
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@ -1776,6 +1782,16 @@ extern void c4x_encode_section_info ();
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case CONST_INT: \
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if (c4x_J_constant (RTX)) \
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return 0; \
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if (! TARGET_C3X \
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&& OUTER_CODE == AND \
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&& GET_CODE (RTX) == CONST_INT \
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&& (INTVAL (RTX) == 255 || INTVAL (RTX) == 65535)) \
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return 0; \
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if (! TARGET_C3X \
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&& (OUTER_CODE == ASHIFTRT || OUTER_CODE == LSHIFTRT) \
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&& GET_CODE (RTX) == CONST_INT \
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&& (INTVAL (RTX) == 16 || INTVAL (RTX) == 24)) \
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return 0; \
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if (TARGET_C3X && SHIFT_CODE_P (OUTER_CODE)) \
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return 3; \
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if (LOGICAL_CODE_P (OUTER_CODE) \
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