The existing setting of max_cond_insns for most cores is non-optimal.
Thumb-2 IT has a maximum limit of 4, so 5 means emitting 2 IT sequences.
Also such long sequences of conditional instructions can increase the number
of executed instructions significantly, so using 5 for max_cond_insns is
non-op
ping
Richard Earnshaw (lists) wrote:
> On 05/05/17 13:42, Wilco Dijkstra wrote:
>> Richard Earnshaw (lists) wrote:
>>> On 04/05/17 18:38, Wilco Dijkstra wrote:
>>> > Richard Earnshaw wrote:
>>> >
> - 5, /* Max cond insns. */
> + 2,
ping
Richard Earnshaw (lists) wrote:
> On 05/05/17 13:42, Wilco Dijkstra wrote:
>> Richard Earnshaw (lists) wrote:
>>> On 04/05/17 18:38, Wilco Dijkstra wrote:
>>> > Richard Earnshaw wrote:
>>> >
> - 5, /* Max cond insns. */
> + 2,
Richard Earnshaw (lists) wrote:
> On 05/05/17 13:42, Wilco Dijkstra wrote:
>> Richard Earnshaw (lists) wrote:
>>> On 04/05/17 18:38, Wilco Dijkstra wrote:
>>> > Richard Earnshaw wrote:
>>> >
> - 5, /* Max cond insns. */
> + 2,
On 05/05/17 13:42, Wilco Dijkstra wrote:
> Richard Earnshaw (lists) wrote:
>> On 04/05/17 18:38, Wilco Dijkstra wrote:
>> > Richard Earnshaw wrote:
>> >
- 5, /* Max cond insns. */
+ 2, /* Max cond insns.
Richard Earnshaw (lists) wrote:
> On 04/05/17 18:38, Wilco Dijkstra wrote:
> > Richard Earnshaw wrote:
> >
>>> - 5, /* Max cond insns. */
>>> + 2, /* Max cond insns. */
>>
>>> This parameter is also used for A32 c
On 04/05/17 18:38, Wilco Dijkstra wrote:
> Richard Earnshaw wrote:
>
>> - 5, /* Max cond insns. */
>> + 2, /* Max cond insns. */
>
>> This parameter is also used for A32 code. Is that really the right
>> number t
Richard Earnshaw wrote:
> - 5, /* Max cond insns. */
> + 2, /* Max cond insns. */
> This parameter is also used for A32 code. Is that really the right
> number there as well?
Yes, this parameter has always been
On 12/04/17 14:02, Wilco Dijkstra wrote:
> The existing setting of max_cond_insns for most cores is non-optimal.
> Thumb-2 IT has a maximum limit of 4, so 5 means emitting 2 IT sequences.
> Also such long sequences of conditional instructions can increase the number
> of executed instructions signi
ping
From: Wilco Dijkstra
Sent: 12 April 2017 14:02
To: GCC Patches
Cc: nd; Kyrylo Tkachov
Subject: [PATCH][ARM] Update max_cond_insns settings
The existing setting of max_cond_insns for most cores is non-optimal.
Thumb-2 IT has a maximum limit of 4, so 5 means emitting 2 IT sequences
The existing setting of max_cond_insns for most cores is non-optimal.
Thumb-2 IT has a maximum limit of 4, so 5 means emitting 2 IT sequences.
Also such long sequences of conditional instructions can increase the number
of executed instructions significantly, so using 5 for max_cond_insns is
non-op
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