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h8300.md (adjust_length): New attribute.

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Mon Mar 22 10:44:33 1999  Vladimir Makarov  <vmakarov@tofu.to.cygnus.com>
	* config/h8300/h8300.md (adjust_length): New attribute.
 	(modhi3+1, andsi3+1, iorsi3+1, extzv+1, extzv+2): Change insn
 	default value of attribute "adjust_length" onto "no".
	* config/h8300/h8300.c (h8300_adjust_insn_length):  Use 0 if the
	shift is negative.
	* final.c (shorten_branches): Check insn length after its
 	adjusting.

From-SVN: r25895
This commit is contained in:
Vladimir Makarov 1999-03-22 07:56:09 +00:00 committed by Vladimir Makarov
parent 4b9f933c7c
commit 04b6000c82
4 changed files with 49 additions and 16 deletions
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12
gcc/ChangeLog
View File

@ -1,3 +1,15 @@
Mon Mar 22 10:44:33 1999 Vladimir Makarov <vmakarov@tofu.to.cygnus.com>
* config/h8300/h8300.md (adjust_length): New attribute.
(modhi3+1, andsi3+1, iorsi3+1, extzv+1, extzv+2): Change insn
default value of attribute "adjust_length" onto "no".
* config/h8300/h8300.c (h8300_adjust_insn_length): Use 0 if the
shift is negative.
* final.c (shorten_branches): Check insn length after its
adjusting.
Sun Mar 21 17:33:48 1999 Jeffrey A Law (law@cygnus.com)
* i860.h (TARGET_SWITCHES): Add documentation for default case.

36
gcc/config/h8300/h8300.c
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@ -3031,7 +3031,12 @@ h8300_adjust_insn_length (insn, length)
rtx insn;
int length;
{
rtx pat = PATTERN (insn);
rtx pat;
if (get_attr_adjust_length (insn) == ADJUST_LENGTH_NO)
return 0;
pat = PATTERN (insn);
/* Adjust length for reg->mem and mem->reg copies. */
if (GET_CODE (pat) == SET
@ -3109,34 +3114,37 @@ h8300_adjust_insn_length (insn, length)
{
rtx src = SET_SRC (XVECEXP (pat, 0, 0));
enum machine_mode mode = GET_MODE (src);
int shift;
if (GET_CODE (XEXP (src, 1)) != CONST_INT)
return 0;
shift = INTVAL (XEXP (src, 1));
/* According to ANSI, negative shift is undefined. It is
considered to be zero in this case (see function
emit_a_shift above). */
if (shift < 0)
shift = 0;
/* QImode shifts by small constants take one insn
per shift. So the adjustment is 20 (md length) -
# shifts * 2. */
if (mode == QImode && INTVAL (XEXP (src, 1)) <= 4)
return -(20 - INTVAL (XEXP (src, 1)) * 2);
if (mode == QImode && shift <= 4)
return -(20 - shift * 2);
/* Similarly for HImode and SImode shifts by
small constants on the H8/300H and H8/300S. */
if ((TARGET_H8300H || TARGET_H8300S)
&& (mode == HImode || mode == SImode)
&& INTVAL (XEXP (src, 1)) <= 4)
return -(20 - INTVAL (XEXP (src, 1)) * 2);
&& (mode == HImode || mode == SImode) && shift <= 4)
return -(20 - shift * 2);
/* HImode shifts by small constants for the H8/300. */
if (mode == HImode
&& INTVAL (XEXP (src, 1)) <= 4)
return -(20 - (INTVAL (XEXP (src, 1))
* (GET_CODE (src) == ASHIFT ? 2 : 4)));
if (mode == HImode && shift <= 4)
return -(20 - (shift * (GET_CODE (src) == ASHIFT ? 2 : 4)));
/* SImode shifts by small constants for the H8/300. */
if (mode == SImode
&& INTVAL (XEXP (src, 1)) <= 2)
return -(20 - (INTVAL (XEXP (src, 1))
* (GET_CODE (src) == ASHIFT ? 6 : 8)));
if (mode == SImode && shift <= 2)
return -(20 - (shift * (GET_CODE (src) == ASHIFT ? 6 : 8)));
/* XXX ??? Could check for more shift/rotate cases here. */
}

15
gcc/config/h8300/h8300.md
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@ -81,6 +81,12 @@
(const_int 6)))]
(const_int 200)))
;; The necessity of instruction length adjustment.
(define_attr "adjust_length" "yes,no"
(cond [(eq_attr "type" "branch") (const_string "no")]
(const_string "yes")))
;; Condition code settings.
;; none - insn does not affect cc
;; none_0hit - insn does not affect cc but it does modify operand 0
@ -983,6 +989,7 @@
and %X2,%X0
bclr %W2,%R0"
[(set_attr "length" "2,4")
(set_attr "adjust_length" "no")
(set_attr "cc" "set_znv,none_0hit")])
(define_expand "andqi3"
@ -1087,6 +1094,7 @@
or %X2,%X0
bset %V2,%R0"
[(set_attr "length" "2,4")
(set_attr "adjust_length" "no")
(set_attr "cc" "set_znv,none_0hit")])
(define_expand "iorqi3"
@ -1173,6 +1181,7 @@
xor %X2,%X0
bnot %V2,%R0"
[(set_attr "length" "2,4")
(set_attr "adjust_length" "no")
(set_attr "cc" "set_znv,none_0hit")])
(define_expand "xorqi3"
@ -2226,7 +2235,8 @@
""
"bld %Z2,%Y1\;%b4 #0,%R0\;bst #0,%R0; bl1"
[(set_attr "cc" "clobber")
(set_attr "length" "6")])
(set_attr "length" "6")
(set_attr "adjust_length" "no")])
(define_insn ""
[(set (match_operand:HI 0 "bit_operand" "=Ur")
@ -2240,7 +2250,8 @@
""
"bld %Z2,%Y1\;%b5 %Z4,%Y3\;bst #0,%R0; bl3"
[(set_attr "cc" "clobber")
(set_attr "length" "6")])
(set_attr "length" "6")
(set_attr "adjust_length" "no")])
;; ----------------------------------------------

2
gcc/final.c
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@ -1318,6 +1318,8 @@ shorten_branches (first)
/* If needed, do any adjustment. */
#ifdef ADJUST_INSN_LENGTH
ADJUST_INSN_LENGTH (insn, insn_lengths[uid]);
if (insn_lengths[uid] < 0)
fatal_insn ("Negative insn length", insn);
#endif
}