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bfin.c (bfin_optimize_loop): If we need a scratch reg, scan backwards to try to find a constant to initialize it.

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* config/bfin/bfin.c (bfin_optimize_loop): If we need a scratch reg,
	scan backwards to try to find a constant to initialize it.

From-SVN: r146974
This commit is contained in:
Bernd Schmidt 2009-04-29 15:09:37 +00:00 • committed by Bernd Schmidt
parent 7c90021d8e
commit e50e30817e
2 changed files with 35 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2009-04-29 Bernd Schmidt <bernd.schmidt@analog.com>
* config/bfin/bfin.c (bfin_optimize_loop): If we need a scratch reg,
scan backwards to try to find a constant to initialize it.
2009-04-29 Richard Guenther <rguenther@suse.de>
PR middle-end/39937

34
gcc/config/bfin/bfin.c
View file

@ -3784,7 +3784,7 @@ bfin_optimize_loop (loop_info loop)
rtx insn, last_insn;
rtx loop_init, start_label, end_label;
rtx reg_lc0, reg_lc1, reg_lt0, reg_lt1, reg_lb0, reg_lb1;
rtx iter_reg, scratchreg;
rtx iter_reg, scratchreg, scratch_init, scratch_init_insn;
rtx lc_reg, lt_reg, lb_reg;
rtx seq, seq_end;
int length;
@ -3838,18 +3838,40 @@ bfin_optimize_loop (loop_info loop)
goto bad_loop;
}
scratchreg = NULL_RTX;
scratch_init = iter_reg;
scratch_init_insn = NULL_RTX;
if (!PREG_P (iter_reg) && loop->incoming_src)
{
basic_block bb_in = loop->incoming_src;
int i;
for (i = REG_P0; i <= REG_P5; i++)
if ((df_regs_ever_live_p (i)
|| (funkind (TREE_TYPE (current_function_decl)) == SUBROUTINE
&& call_used_regs[i]))
&& !REGNO_REG_SET_P (df_get_live_out (loop->incoming_src), i))
&& !REGNO_REG_SET_P (df_get_live_out (bb_in), i))
{
scratchreg = gen_rtx_REG (SImode, i);
break;
}
for (insn = BB_END (bb_in); insn != BB_HEAD (bb_in);
insn = PREV_INSN (insn))
{
rtx set;
if (NOTE_P (insn) || BARRIER_P (insn))
continue;
set = single_set (insn);
if (set && rtx_equal_p (SET_DEST (set), iter_reg))
{
if (CONSTANT_P (SET_SRC (set)))
{
scratch_init = SET_SRC (set);
scratch_init_insn = insn;
}
break;
}
else if (reg_mentioned_p (iter_reg, PATTERN (insn)))
break;
}
}
if (loop->incoming_src)
@ -4092,11 +4114,13 @@ bfin_optimize_loop (loop_info loop)
}
else if (scratchreg != NULL_RTX)
{
emit_insn (gen_movsi (scratchreg, iter_reg));
emit_insn (gen_movsi (scratchreg, scratch_init));
loop_init = gen_lsetup_with_autoinit (lt_reg, start_label,
lb_reg, end_label,
lc_reg, scratchreg);
seq_end = emit_insn (loop_init);
if (scratch_init_insn != NULL_RTX)
delete_insn (scratch_init_insn);
}
else
{
@ -4106,12 +4130,14 @@ bfin_optimize_loop (loop_info loop)
rtx pop = gen_frame_mem (SImode,
gen_rtx_POST_INC (SImode, stack_pointer_rtx));
emit_insn (gen_movsi (push, p0reg));
emit_insn (gen_movsi (p0reg, iter_reg));
emit_insn (gen_movsi (p0reg, scratch_init));
loop_init = gen_lsetup_with_autoinit (lt_reg, start_label,
lb_reg, end_label,
lc_reg, p0reg);
emit_insn (loop_init);
seq_end = emit_insn (gen_movsi (p0reg, pop));
if (scratch_init_insn != NULL_RTX)
delete_insn (scratch_init_insn);
}
if (dump_file)