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re PR target/53975 ([ia64] Target register of a speculative load moved to a branch register prior to the chk.s instruction) 

PR target/53975

        * sel-sched-ir.c (has_dependence_note_reg_use): Clarify comment.

        Revert
        2011-08-04  Sergey Grechanik  <mouseentity@ispras.ru>

        * sel-sched-ir.c (has_dependence_note_reg_use): Call ds_full_merge
        only if producer writes to the register given by regno.

From-SVN: r190005
This commit is contained in:
Andrey Belevantsev 2012-07-31 14:56:52 +04:00 committed by Andrey Belevantsev
parent 7027164c96
commit 0d4acd9048
2 changed files with 18 additions and 4 deletions
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12
gcc/ChangeLog
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@ -1,3 +1,15 @@
2012-07-31 Andrey Belevantsev <abel@ispras.ru>
PR target/53975
* sel-sched-ir.c (has_dependence_note_reg_use): Clarify comment.
Revert
2011-08-04 Sergey Grechanik <mouseentity@ispras.ru>
* sel-sched-ir.c (has_dependence_note_reg_use): Call ds_full_merge
only if producer writes to the register given by regno.
2012-07-31 Nick Clifton <nickc@redhat.com>
* config/frv/frv.c (QUAD): Fix typo.

10
gcc/sel-sched-ir.c
View File

@ -3228,7 +3228,11 @@ has_dependence_note_reg_use (int regno)
if (reg_last->clobbers)
*dsp = (*dsp & ~SPECULATIVE) | DEP_ANTI;
/* Handle BE_IN_SPEC. */
/* Merge BE_IN_SPEC bits into *DSP when the dependency producer
is actually a check insn. We need to do this for any register
read-read dependency with the check unless we track properly
all registers written by BE_IN_SPEC-speculated insns, as
we don't have explicit dependence lists. See PR 53975. */
if (reg_last->uses)
{
ds_t pro_spec_checked_ds;
@ -3236,9 +3240,7 @@ has_dependence_note_reg_use (int regno)
pro_spec_checked_ds = INSN_SPEC_CHECKED_DS (has_dependence_data.pro);
pro_spec_checked_ds = ds_get_max_dep_weak (pro_spec_checked_ds);
if (pro_spec_checked_ds != 0
&& bitmap_bit_p (INSN_REG_SETS (has_dependence_data.pro), regno))
/* Merge BE_IN_SPEC bits into *DSP. */
if (pro_spec_checked_ds != 0)
*dsp = ds_full_merge (*dsp, pro_spec_checked_ds,
NULL_RTX, NULL_RTX);
}