[LLVMdev] LLVM ERROR: Cannot select

[Zhiyuan Ren]

Duncan,

here is part of the assembly around the problem area. I used gcc -S -flto
to generate the .s file, llvm-as on the .s fiile will show error: invalid
cast opcode for cast from 'i40' to 'float'  %638 = trunc i40 %637 to float

%633 = bitcast i8* %632 to float*
  %634 = bitcast float* %633 to i40*
  %635 = load i40* %634, align 1
  %636 = shl i40 %635, 7
  %637 = ashr i40 %636, 8
  %638 = trunc i40 %637 to float

Thanks,
ZY


On Sat, May 11, 2013 at 3:49 PM, Duncan Sands <baldrick at free.fr> wrote:

> Hi ZY,
>
>
> On 11/05/13 20:37, Zhiyuan Ren wrote:
>
>> Duncan,
>>
>> Thanks for getting back to me. I am not sure how to find the original
>> bitcode
>> (and related Ada source code) that causes the truncate. This is the error
>> message that gcc gave me when I tried to compile an Ada source file using
>> dragonegg plugin (gcc -c -fplugin...).
>>
>
> use -S instead of -c and add -flto
> The resulting .s file contains the bitcode.  Please send in the file.
>
> Ciao, Duncan.
>
>
>> ZY
>>
>> ps, sorry for multiple emails, trying to find out how to reply to a
>> thread in
>> the mailing list
>>
>>
>> On Sat, May 11, 2013 at 12:42 PM, Duncan Sands <baldrick at free.fr
>> <mailto:baldrick at free.fr>> wrote:
>>
>>     Hi ZY,
>>
>>
>>     On 10/05/13 22:34, Zhiyuan Ren wrote:
>>
>>         Hello, I am new to LLVM and doing some experiment with 3.2 on Ada
>> code. Can
>>         anyone help me on the following error message?
>>
>>
>>     a truncate from an i32 to an f32 is not valid.  This caused the code
>> generator
>>     to abort.  What is the original bitcode that caused this?
>>
>>     Ciao, Duncan.
>>
>>
>>         Thanks,
>>         ZY
>>
>>
>>         LLVM ERROR: Cannot select: 0xa7a0bf0: f32 = truncate 0xa7a5ea8
>> [ID=24]
>>             0xa7a5ea8: i32 = X86ISD::SHLD 0xa790280, 0xa790390, 0xa76e088
>> [ID=22]
>>               0xa790280: i32,ch = load 0xa7386a0, 0xa7a68d8,
>> 0xa7a5628<LD1[%1482+4],
>>         anyext from i8> [ID=19]
>>                 0xa7a68d8: i32 = add 0xa7a6040, 0xa7a11c8 [ID=15]
>>                   0xa7a6040: i32,ch = CopyFromReg 0xa7386a0, 0xa790c98
>> [ORD=741]
>>         [ID=12]
>>                     0xa790c98: i32 = Register %vreg7 [ORD=741] [ID=3]
>>                   0xa7a11c8: i32 = Constant<13> [ID=7]
>>                 0xa7a5628: i32 = undef [ORD=737] [ID=2]
>>               0xa790390: i32,ch = load 0xa7386a0, 0xa7a57c0,
>>         0xa7a5628<LD4[%1482](align=1)> [ID=20]
>>                 0xa7a57c0: i32 = add 0xa7a6040, 0xa7a5f30 [ID=16]
>>                   0xa7a6040: i32,ch = CopyFromReg 0xa7386a0, 0xa790c98
>> [ORD=741]
>>         [ID=12]
>>                     0xa790c98: i32 = Register %vreg7 [ORD=741] [ID=3]
>>                   0xa7a5f30: i32 = Constant<9> [ID=5]
>>                 0xa7a5628: i32 = undef [ORD=737] [ID=2]
>>               0xa76e088: i8 = Constant<31> [ID=6]
>>
>>
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