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sparc.md (ldd peephole2s): Fix final arg to mems_ok_for_ldd_peep when the order of the loads being...

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2002-04-02  David S. Miller  <davem@redhat.com>

	* config/sparc/sparc.md (ldd peephole2s): Fix final arg to
	mems_ok_for_ldd_peep when the order of the loads being examined
	is reversed.
	* config/sparc/sparc.c (mems_ok_for_ldd_peep): Expand upon
	existing comment to increase comprehension of this situation.

From-SVN: r51796
This commit is contained in:
David S. Miller 2002-04-02 22:31:45 -08:00 • committed by David S. Miller
parent 856544448e
commit 0acf409fdc
3 changed files with 24 additions and 2 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2002-04-02 David S. Miller <davem@redhat.com>
* config/sparc/sparc.md (ldd peephole2s): Fix final arg to
mems_ok_for_ldd_peep when the order of the loads being examined
is reversed.
* config/sparc/sparc.c (mems_ok_for_ldd_peep): Expand upon
existing comment to increase comprehension of this situation.
2002-04-02 Zack Weinberg <zack@codesourcery.com>
* config/sh/sh.md: Don't use union real_extract.

14
gcc/config/sparc/sparc.c
View file

@ -5798,6 +5798,20 @@ registers_ok_for_ldd_peep (reg1, reg2)
ld [%o0 + 4], %o1
to
ldd [%o0], %o0
nor:
ld [%g3 + 4], %g3
ld [%g3], %g2
to
ldd [%g3], %g2
But, note that the transformation from:
ld [%g2 + 4], %g3
ld [%g2], %g2
to
ldd [%g2], %g2
is perfectly fine. Thus, the peephole2 patterns always pass us
the destination register of the first load, never the second one.
For stores we don't have a similar problem, so dependent_reg_rtx is
NULL_RTX. */

4
gcc/config/sparc/sparc.md
View file

@ -9062,7 +9062,7 @@
(set (match_operand:SI 2 "register_operand" "")
(match_operand:SI 3 "memory_operand" ""))]
"registers_ok_for_ldd_peep (operands[2], operands[0])
&& mems_ok_for_ldd_peep (operands[3], operands[1], operands[2])"
&& mems_ok_for_ldd_peep (operands[3], operands[1], operands[0])"
[(set (match_dup 2)
(match_dup 3))]
"operands[3] = change_address (operands[3], DImode, NULL);
@ -9087,7 +9087,7 @@
(set (match_operand:SF 2 "register_operand" "")
(match_operand:SF 3 "memory_operand" ""))]
"registers_ok_for_ldd_peep (operands[2], operands[0])
&& mems_ok_for_ldd_peep (operands[3], operands[1], operands[2])"
&& mems_ok_for_ldd_peep (operands[3], operands[1], operands[0])"
[(set (match_dup 2)
(match_dup 3))]
"operands[3] = change_address (operands[3], DFmode, NULL);