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re PR target/54089 ([SH] Refactor shift patterns) 

PR target/54089
	* config/sh/sh.md (ashlsi3_d): Do not split if it would result
	in a T_REG clobber.  Correct comment.
	(ashlsi3_n): Correct comment.

From-SVN: r190457
This commit is contained in:
Oleg Endo 2012-08-16 23:13:11 +00:00
parent f5a53fc7af
commit 043d627e06
2 changed files with 14 additions and 5 deletions
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9
gcc/ChangeLog
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@ -1,4 +1,11 @@
2012-08-17 Hans-Peter Nilsson <hp@axis.com>
2012-08-16 Oleg Endo <olegendo@gcc.gnu.org>
PR target/54089
* config/sh/sh.md (ashlsi3_d): Do not split if it would result
in a T_REG clobber. Correct comment.
(ashlsi3_n): Correct comment.
2012-08-16 Hans-Peter Nilsson <hp@axis.com>
PR middle-end/54261
* optabs.c (expand_atomic_fetch_op): Save and restore code when

10
gcc/config/sh/sh.md
View File

@ -3746,7 +3746,8 @@ label:
(match_operand:SI 2 "shift_count_operand" "r")))]
"TARGET_DYNSHIFT"
"shld %2,%0"
"&& (CONST_INT_P (operands[2]) && ! sh_dynamicalize_shift_p (operands[2]))"
"&& CONST_INT_P (operands[2]) && ! sh_dynamicalize_shift_p (operands[2])
&& ! sh_ashlsi_clobbers_t_reg_p (operands[2])"
[(const_int 0)]
{
if (satisfies_constraint_P27 (operands[2]))
@ -3759,7 +3760,9 @@ label:
/* This must happen before reload, otherwise the constant will be moved
into a register due to the "r" constraint, after which this split
cannot be done anymore.
Unfortunately the move insn will not always be eliminated. */
Unfortunately the move insn will not always be eliminated.
Also, here we must not create a shift sequence that clobbers the
T_REG. */
emit_move_insn (operands[0], operands[1]);
gen_shifty_op (ASHIFT, operands);
DONE;
@ -3782,8 +3785,7 @@ label:
if (sh_dynamicalize_shift_p (operands[2]) && can_create_pseudo_p ())
{
/* If this pattern was picked and dynamic shifts are supported, switch
to dynamic shift pattern before reload. However, we must not
create a shift sequence that clobbers the T_REG. */
to dynamic shift pattern before reload. */
operands[2] = force_reg (SImode, operands[2]);
emit_insn (gen_ashlsi3_d (operands[0], operands[1], operands[2]));
}