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* pa.md (add reg and large int): New define_splits for the combiner.

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From-SVN: r3695
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Jeff Law 1993-03-10 10:31:14 -07:00
parent d390794555
commit 08cddb03ae
1 changed files with 56 additions and 0 deletions
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56
gcc/config/pa/pa.md
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@ -1681,6 +1681,62 @@
""
"uaddcm %2,%1,%0")
;; define_splits to optimize cases of adding a constant integer
;; to a register when the constant does not fit in 14 bits. */
(define_split
[(set (match_operand:SI 0 "register_operand" "")
(plus:SI (match_operand:SI 1 "register_operand" "")
(match_operand:SI 2 "const_int_operand" "")))
(clobber (match_operand:SI 4 "register_operand" ""))]
"! cint_ok_for_move (INTVAL (operands[2]))
&& VAL_14_BITS_P (INTVAL (operands[2]) / 2)"
[(set (match_dup 4) (plus:SI (match_dup 1) (match_dup 2)))
(set (match_dup 0) (plus:SI (match_dup 4) (match_dup 3)))]
"
{
int val = INTVAL (operands[2]);
int low = (val < 0) ? -0x2000 : 0x1fff;
int rest = val - low;
operands[2] = GEN_INT (rest);
operands[3] = GEN_INT (low);
}")
(define_split
[(set (match_operand:SI 0 "register_operand" "")
(plus:SI (match_operand:SI 1 "register_operand" "")
(match_operand:SI 2 "const_int_operand" "")))
(clobber (match_operand:SI 4 "register_operand" ""))]
"! cint_ok_for_move (INTVAL (operands[2]))"
[(set (match_dup 4) (match_dup 2))
(set (match_dup 0) (plus:SI (mult:SI (match_dup 4) (match_dup 3))
(match_dup 1)))]
"
{
int intval = INTVAL (operands[2]);
/* Try diving the constant by 2, then 4, and finally 8 to see
if we can get a constant which can be loaded into a register
in a single instruction (cint_ok_for_move). */
if (intval % 2 == 0 && cint_ok_for_move (intval / 2))
{
operands[2] = GEN_INT (INTVAL (operands[2]) / 2);
operands[3] = GEN_INT (2);
}
else if (intval % 4 == 0 && cint_ok_for_move (intval / 4))
{
operands[2] = GEN_INT (INTVAL (operands[2]) / 4);
operands[3] = GEN_INT (4);
}
else if (intval % 8 == 0 && cint_ok_for_move (intval / 8))
{
operands[2] = GEN_INT (INTVAL (operands[2]) / 8);
operands[3] = GEN_INT (8);
}
else
FAIL;
}")
(define_insn "addsi3"
[(set (match_operand:SI 0 "register_operand" "=r,r")
(plus:SI (match_operand:SI 1 "register_operand" "%r,r")