hi, Richard
On Mon, Sep 26, 2011 at 11:50 AM, Richard Sandiford
<rdsandif...@googlemail.com> wrote:
> Dinar Temirbulatov <dtemirbula...@gmail.com> writes:
>> I found typo in the patch instead of checking *set_after != 0 it was
>> set_after != 0, here is corrected version of patch. I retested the
>> patch without typo on mipsel-unknown-linux-gnu with no new
>> regressions.
>
> But my point was that *set_after should always be nonnull if *delayed_reg
> is. So we shouldn't need that check anyway.
oh, sorry that I missed that.
> The patch looks OK otherwise apart from formatting (the formatting should
> be the same as in the version I suggested before:
>
> else if (*delayed_reg != 0
> && reg_referenced_p (*delayed_reg, pattern)
> && !(recog_memoized (insn) == CODE_FOR_load_highdf
> && recog_memoized (*set_after) == CODE_FOR_load_lowdf))
>
I prepared the new version of patch, re-tested new version on again on
mipsel-unknown-linux-gnu with no new regressions.
thanks, Dinar.
diff -ruNp gcc-20110912-orig/gcc/config/mips/mips.c gcc-20110912-fixed/gcc/config/mips/mips.c
--- gcc-20110912-orig/gcc/config/mips/mips.c 2011-09-12 17:22:27.576457121 +0400
+++ gcc-20110912-fixed/gcc/config/mips/mips.c 2011-09-27 07:57:28.087366163 +0400
@@ -14659,20 +14659,20 @@ mips_orphaned_high_part_p (htab_t htab,
INSN and a previous instruction, avoid it by inserting nops after
instruction AFTER.
- *DELAYED_REG and *HILO_DELAY describe the hazards that apply at
- this point. If *DELAYED_REG is non-null, INSN must wait a cycle
- before using the value of that register. *HILO_DELAY counts the
- number of instructions since the last hilo hazard (that is,
- the number of instructions since the last MFLO or MFHI).
+ *DELAYED_REG, *SET_AFTER and *HILO_DELAY describe the hazards that
+ apply at this point. If *DELAYED_REG and *SET_AFTER is non-null,
+ INSN must wait a cycle before using the value of that register.
+ *HILO_DELAY counts the number of instructions since the last hilo hazard
+ (that is, the number of instructions since the last MFLO or MFHI).
- After inserting nops for INSN, update *DELAYED_REG and *HILO_DELAY
- for the next instruction.
+ After inserting nops for INSN, update *DELAYED_REG, *SET_AFTER
+ and *HILO_DELAY for the next instruction.
LO_REG is an rtx for the LO register, used in dependence checking. */
static void
mips_avoid_hazard (rtx after, rtx insn, int *hilo_delay,
- rtx *delayed_reg, rtx lo_reg)
+ rtx *delayed_reg, rtx lo_reg, rtx *set_after)
{
rtx pattern, set;
int nops, ninsns;
@@ -14696,7 +14696,10 @@ mips_avoid_hazard (rtx after, rtx insn,
clobber hi and lo. */
if (*hilo_delay < 2 && reg_set_p (lo_reg, pattern))
nops = 2 - *hilo_delay;
- else if (*delayed_reg != 0 && reg_referenced_p (*delayed_reg, pattern))
+ else if (*delayed_reg != 0
+ && reg_referenced_p (*delayed_reg, pattern)
+ && !(recog_memoized (insn) == CODE_FOR_load_highdf
+ && recog_memoized (*set_after) == CODE_FOR_load_lowdf))
nops = 1;
else
nops = 0;
@@ -14710,6 +14713,7 @@ mips_avoid_hazard (rtx after, rtx insn,
/* Set up the state for the next instruction. */
*hilo_delay += ninsns;
*delayed_reg = 0;
+ *set_after = 0;
if (INSN_CODE (insn) >= 0)
switch (get_attr_hazard (insn))
{
@@ -14724,6 +14728,7 @@ mips_avoid_hazard (rtx after, rtx insn,
set = single_set (insn);
gcc_assert (set);
*delayed_reg = SET_DEST (set);
+ *set_after = insn;
break;
}
}
@@ -14736,7 +14741,7 @@ mips_avoid_hazard (rtx after, rtx insn,
static void
mips_reorg_process_insns (void)
{
- rtx insn, last_insn, subinsn, next_insn, lo_reg, delayed_reg;
+ rtx insn, last_insn, subinsn, next_insn, lo_reg, delayed_reg, set_after;
int hilo_delay;
htab_t htab;
@@ -14811,7 +14816,7 @@ mips_reorg_process_insns (void)
INSN_CODE (subinsn) = CODE_FOR_nop;
}
mips_avoid_hazard (last_insn, subinsn, &hilo_delay,
- &delayed_reg, lo_reg);
+ &delayed_reg, lo_reg, &set_after);
}
last_insn = insn;
}
@@ -14832,7 +14837,7 @@ mips_reorg_process_insns (void)
else
{
mips_avoid_hazard (last_insn, insn, &hilo_delay,
- &delayed_reg, lo_reg);
+ &delayed_reg, lo_reg, &set_after);
last_insn = insn;
}
}
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