On 6/17/25 5:58 PM, Jeff Law wrote:
> You could make the argument that instead of defaulting to rocket that we
> should use a default generic tuning model. That would make much more
> sense than deliberately choosing the wrong values for the rocket uarch
> because it happens to be used as the d
On 18/6/2025 09:07, Kito Cheng wrote:
Maybe it's a good time to create a -mtune=generic and copy-and-modify
from rocket?
Indeed, it appears to be the most suitable solution.
Thanks,
Yangyu Chen
On Wed, Jun 18, 2025 at 6:59 AM Jeff Law wrote:
On 6/17/25 10:51 AM, Yangyu Chen wrote:
Maybe it's a good time to create a -mtune=generic and copy-and-modify
from rocket?
On Wed, Jun 18, 2025 at 6:59 AM Jeff Law wrote:
>
>
>
> On 6/17/25 10:51 AM, Yangyu Chen wrote:
> >
> >
> > On 17/6/2025 20:42, Jeff Law wrote:
> >>
> >>
> >> On 6/16/25 10:08 PM, Dongyan Chen wrote:
> >>> Hi, I've
On 6/17/25 10:51 AM, Yangyu Chen wrote:
On 17/6/2025 20:42, Jeff Law wrote:
On 6/16/25 10:08 PM, Dongyan Chen wrote:
Hi, I've come across a question regarding the branch cost of gcc. In
the link
https://gcc.godbolt.org/z/hnddevd5h, gcc fails to recognize the
optimization
branch judgment
On 6/17/25 3:24 PM, Andrew Waterman wrote:
I designed Rocket, so I can confirm Yangyu's comment that the branch
misprediction penalty is usually 3 cycles. (It's actually 4 if the
address of the correct-path instruction is a 4-byte-long instruction
that isn't naturally aligned, but that shou
On Tue, Jun 17, 2025 at 5:43 AM Jeff Law wrote:
>
>
>
> On 6/16/25 10:08 PM, Dongyan Chen wrote:
> > Hi, I've come across a question regarding the branch cost of gcc. In the
> > link
> > https://gcc.godbolt.org/z/hnddevd5h, gcc fails to recognize the optimization
> > branch judgment, while llvm d
On 17/6/2025 20:42, Jeff Law wrote:
On 6/16/25 10:08 PM, Dongyan Chen wrote:
Hi, I've come across a question regarding the branch cost of gcc. In
the link
https://gcc.godbolt.org/z/hnddevd5h, gcc fails to recognize the
optimization
branch judgment, while llvm does. I eventually discovered
On 6/16/25 10:08 PM, Dongyan Chen wrote:
Hi, I've come across a question regarding the branch cost of gcc. In the link
https://gcc.godbolt.org/z/hnddevd5h, gcc fails to recognize the optimization
branch judgment, while llvm does. I eventually discovered that the value of the
branch
cost was t
On 6/16/25 10:08 PM, Dongyan Chen wrote:
Hi, I've come across a question regarding the branch cost of gcc. In the link
https://gcc.godbolt.org/z/hnddevd5h, gcc fails to recognize the optimization
branch judgment, while llvm does. I eventually discovered that the value of the
branch
cost was t
On 17/6/2025 12:08, Dongyan Chen wrote:
Hi, I've come across a question regarding the branch cost of gcc. In the link
https://gcc.godbolt.org/z/hnddevd5h, gcc fails to recognize the optimization
branch judgment, while llvm does. I eventually discovered that the value of the
branch
cost was to
Thanks very much!
Dongyan Chen
在 2025/6/17 15:34, Yangyu Chen 写道:
On 17/6/2025 12:08, Dongyan Chen wrote:
Hi, I've come across a question regarding the branch cost of gcc. In
the link
https://gcc.godbolt.org/z/hnddevd5h, gcc fails to recognize the
optimization
branch judgment, while llvm d
Hi, I've come across a question regarding the branch cost of gcc. In the link
https://gcc.godbolt.org/z/hnddevd5h, gcc fails to recognize the optimization
branch judgment, while llvm does. I eventually discovered that the value of the
branch
cost was too small. Moreover, in that link, if I add "-m
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