Displaying 6 results from an estimated 6 matches for "65bit".
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2009 Oct 13
2
[LLVMdev] 65bit integer math
What does nsw nuw do?
Micah
-----Original Message-----
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
On Behalf Of Dan Gohman
Sent: Tuesday, October 13, 2009 10:06 AM
To: Jeffrey Yasskin
Cc: LLVM Developers Mailing List
Subject: Re: [LLVMdev] 65bit integer math
On Oct 12, 2009, at 9:42 PM, Jeffrey Yasskin wrote:
> On Mon, Oct 12, 2009 at 8:22 PM, Eli Friedman
> <eli.friedman at gmail.com> wrote:
>> On Mon, Oct 12, 2009 at 6:15 PM, Villmow, Micah
<Micah.Villmow at amd.com
>> > wrote:
>>> I have a te...
2009 Oct 13
0
[LLVMdev] 65bit integer math
...2009 at 8:22 PM, Eli Friedman
> <eli.friedman at gmail.com> wrote:
>> On Mon, Oct 12, 2009 at 6:15 PM, Villmow, Micah <Micah.Villmow at amd.com
>> > wrote:
>>> I have a test case(attached as fc_long.ll) that when run through the
>>> optimizer produces 65bit integer math(fc_long-opt.ll).
>>>
>>>
>>>
>>> Now I understand that llvm can have any length integer, but I
>>> consider
>>> turning a 64bit mul into multiple 65 bit instructions to be a ‘bad’
>>> optimization. This eventually expands...
2009 Oct 13
3
[LLVMdev] 65bit integer math
On Mon, Oct 12, 2009 at 8:22 PM, Eli Friedman <eli.friedman at gmail.com> wrote:
> On Mon, Oct 12, 2009 at 6:15 PM, Villmow, Micah <Micah.Villmow at amd.com> wrote:
>> I have a test case(attached as fc_long.ll) that when run through the
>> optimizer produces 65bit integer math(fc_long-opt.ll).
>>
>>
>>
>> Now I understand that llvm can have any length integer, but I consider
>> turning a 64bit mul into multiple 65 bit instructions to be a ‘bad’
>> optimization. This eventually expands to a 128bit multiply call(__multi3)
&g...
2009 Oct 13
4
[LLVMdev] 65bit integer math
I have a test case(attached as fc_long.ll) that when run through the
optimizer produces 65bit integer math(fc_long-opt.ll).
Now I understand that llvm can have any length integer, but I consider
turning a 64bit mul into multiple 65 bit instructions to be a 'bad'
optimization. This eventually expands to a 128bit multiply
call(__multi3) which I have absolutely no interest in suppo...
2009 Oct 13
0
[LLVMdev] 65bit integer math
On Mon, Oct 12, 2009 at 6:15 PM, Villmow, Micah <Micah.Villmow at amd.com> wrote:
> I have a test case(attached as fc_long.ll) that when run through the
> optimizer produces 65bit integer math(fc_long-opt.ll).
>
>
>
> Now I understand that llvm can have any length integer, but I consider
> turning a 64bit mul into multiple 65 bit instructions to be a ‘bad’
> optimization. This eventually expands to a 128bit multiply call(__multi3)
> which I have absolute...
2009 Oct 13
1
[LLVMdev] 65bit integer math
On Monday 12 October 2009 22:22, Eli Friedman wrote:
> > Now I understand that llvm can have any length integer, but I consider
> > turning a 64bit mul into multiple 65 bit instructions to be a ‘bad’
> > optimization. This eventually expands to a 128bit multiply call(__multi3)
> > which I have absolutely no interest in supporting. So I’m wondering what
> >