[llvm-dev] error:Ran out of lanemask bits to represent subregisterr

[Krzysztof Parzyszek via llvm-dev]

It is possible that you have more than 64 lanes. In such case you would 
need to reimplement LaneBitmask with a larger underlying type. Most of 
the functionality is already localized to the header file, the only 
exception may be the "getAsInteger" function. It shouldn't be too hard 
to fix up the uses to deal with a different underlying type.

-Krzysztof


On 7/19/2017 2:56 PM, hameeza ahmed wrote:
> As you mentioned i changed 32 to 64 but now some new errors come which 
> require to change unsigned to uint64_t in mentioned files. i have 
> changed in mentioned files but still errors come to change in other files..
> 
> What to do?
> 
> On Thu, Jul 20, 2017 at 12:08 AM, Craig Topper <craig.topper at gmail.com 
> <mailto:craig.topper at gmail.com>> wrote:
> 
>     Did you change the hardcoded 32 right before the line that prints
>     that error in CodeGenRegisters.cpp to 64?
> 
>     ~Craig
> 
>     On Wed, Jul 19, 2017 at 11:38 AM, hameeza ahmed
>     <hahmed2305 at gmail.com <mailto:hahmed2305 at gmail.com>> wrote:
> 
>         Thank You.
> 
>         I have replaced all the occurrences of unsigned with uint64_t in
>         Lanemask.h and in all other related files like
>         codegenregisters.cpp, codegenregisters.h, MIParser.cpp etc...
>         Also i changed Log2_32 to Log2_64 and replaced 4 with 8 in
>           codegenregisters.cpp, but still getting the same error:
> 
> 
>         error:Ran out of lanemask bits to represent subregister
>         sub_32768bit_hi_then_sub_16384bit_hi_then_sub_8192bit_hi_then_sub_4096bit_hi_then_sub_2048bit_hi_then_sub_32bit_hi_then
> 
>         Now what to do?
> 
>         Please help.
> 
> 
>         On Wed, Jul 19, 2017 at 5:57 PM, Krzysztof Parzyszek
>         <kparzysz at codeaurora.org <mailto:kparzysz at codeaurora.org>> wrote:
> 
>             Hi,
>             The LaneBitmask is implemented in
>             include/llvm/MC/LaneBitmask.h.  You will need to change the
>             underlying type and the associated member functions.
>             If you have a large number of lanes, you will need to
>             replace it with a type that can contain as many independent
>             bits as you need (BitVector would be an ultimate solution). 
>             You may run into some problems with the uses of the member
>             function "getAsInteger", but you can change those to
>             something equivalent according to the type you use.
> 
>             -Krzysztof
> 
> 
>             On 7/19/2017 3:51 AM, hameeza ahmed wrote:
> 
>                 Hello,
>                 Mr. krzysztof I have seen similar question asked by you
>                 on llvm group. Could you please help me here to address
>                 this issue.
> 
>                 i am trying to construct a register of size 65536 bit by
>                 combining 2 registers of 32768 bits. both the 32768 bit
>                 registers are different so i have to use the following
>                 method
> 
>                 let SubRegIndices = [sub_32768bit, sub_32768bit_hi],
>                 CoveredBySubRegs = 1 in
> 
>                 but i am getting following error..
> 
>                 error:Ran out of lanemask bits to represent subregister
>                 sub_32768bit_hi_then_sub_16384bit_hi_then_sub_8192bit_hi_then_sub_4096bit_hi_then_sub_2048bit_hi_then_sub_32bit_hi_then
> 
>                 now how to increase lanemask bits? what changes are
>                 required??
> 
> 
>                 Kindly help.
> 
> 
> 
> 
> 
>             -- 
>             Qualcomm Innovation Center, Inc. is a member of Code Aurora
>             Forum, hosted by The Linux Foundation
> 
> 
> 
> 

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