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  VS Arduino › Visual Micro › Visual Studio 2017, 2019, 2022 › error: unable to find a register to spill in class 'POINTER_REGS
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Normal Topic error: unable to find a register to spill in class 'POINTER_REGS (Read 6153 times)
Scott Wilson
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error: unable to find a register to spill in class 'POINTER_REGS
Dec 14th, 2016 at 1:12am
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Hi, I'm getting a very strange compiler when I include the attached file. This file is a variant of a file that I have used many times. As far as I can tell, the issue is the number of elements in input_hidden1_weights or one of the other arrays. That is, I don't see this problem when InputCount is smaller, etc. I'm using VS2015 and have the latest uMicro add in. Thanks, Scott


namespace HoverTable2
{
#include "Test 20161212UpTo HoverTable2_180.h"
}

***** 

PumpControl_Dancing002.ino:879: In file included from
 
Test 20161212UpTo HoverTable2_180.h: In function void HoverTable2::ScaleInputs(double*, double, double, int)
 
Test 20161212UpTo HoverTable2_180.h: 91:1: error: unable to find a register to spill in class 'POINTER_REGS
 
Test 20161212UpTo HoverTable2_180.h: 91:1: error: this is the insn
(insn 96 95 98 3 (set (reg*: SF 124 [ D.6608 ])
        (mem*: SF (post_inc:HI (reg:HI 2 r2 [orig:133 ivtmp.447 ] [133])) [5 MEM[base: _33, offset: 0B]+0 S4 A8])) C:\Users\scottw\AppData\Local\Temp\VMBuilds\PumpControl_Dancing002\uno\Test 20161212UpTo HoverTable2_180.h:88 99 {*movsf}
     (expr_list*: REG_INC (reg:HI 2 r2 [orig:133 ivtmp.447 ] [133])
   (nil)))
Test 20161212UpTo HoverTable2_180.h:91: confused by earlier errors, bailing out
Error compiling project sources
Build failed for project 'PumpControl_Dancing002'
  
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Scott Wilson
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Re: error: unable to find a register to spill in class 'POINTER_REGS
Reply #1 - Dec 14th, 2016 at 6:02pm
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It appears this is a gcc bug, fixed in v7. I'm not sure how to get this fix into my vMicro environment....

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60040
« Last Edit: Dec 14th, 2016 at 6:02pm by Scott Wilson »  
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Tim@Visual Micro
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Re: error: unable to find a register to spill in class 'POINTER_REGS
Reply #2 - Dec 14th, 2016 at 6:09pm
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Hi,

Visual micro doesn't have any of these sources in it. Instead it uses the sources provided by your config. This means the arduino ide installation and/or the hardware you have installed.

It's not possibe to see what version of arduino or what hardware you are using from your post.

Please switch on vmicro>compiler>verbose and also the "show build properties" switch. Then build and either post or email the build out as a .txt file.

Email info[at]visualmicro.com
  
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Scott Wilson
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Re: error: unable to find a register to spill in class 'POINTER_REGS
Reply #3 - Dec 14th, 2016 at 6:34pm
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Thanks, attached is the output.
  
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Tim@Visual Micro
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Re: error: unable to find a register to spill in class 'POINTER_REGS
Reply #4 - Dec 14th, 2016 at 6:58pm
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Hi,

You are using arduino 1.6.8 which contains gcc 4.8.1

The link you posted shows this is resolved in gcc 4.8.3 but failed again in 4.9.0

If you update to arduino 1.6.13 and then look at the the "built_in_tools_version.txt" in folder "[ArduinoIDE_Folder\hardware\tools\avr" you will see it contains gcc 4.9.2

Hope that then works as hoped.

  
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Scott Wilson
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Re: error: unable to find a register to spill in class 'POINTER_REGS
Reply #5 - Dec 14th, 2016 at 7:30pm
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Thanks so much for your help with this!

My reading of the bug history is different than yours, it appears the patch wasn't committed and still appears in 5.3.

Through some trial and error, I was able to work around the bug by making two of the arrays function local:

void ScaleInputs(double* input, double minimum, double maximum, int size)
{
     // SBW 2016.12.14 Fix for gcc error: : unable to find a register to spill in class 'POINTER_REGS
     // Make these arrays function local. Made const for good measure.
     const double max_input[InputCount] = { 1.20000000000000e+004, 3.21500000000000e+004, 3.24080000000000e+004, 1.89000000000000e+000, 2.01000000000000e+000, 1.20000000000000e-001, 1.00000000000000e+000, 1.19000000000000e+000, 2.26000000000000e+000, 5.15000000000000e+000 };
     const double min_input[InputCount] = { 2.00000000000000e+003, 3.18210000000000e+004, 3.16850000000000e+004, 1.14000000000000e+000, 0.00000000000000e+000, -1.85000000000000e+000, -9.60000000000000e-001, -1.60000000000000e-001, 5.20000000000000e-001, -1.39000000000000e+000 };
     for (long i=0; i<size; i++)
     {
           double delta = (maximum-minimum)/(max_input[i]-min_input[i]);
           input[i] = minimum - delta*min_input[i]+ delta*input[i];
     }
}
  
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Re: error: unable to find a register to spill in class 'POINTER_REGS
Reply #6 - Dec 14th, 2016 at 8:38pm
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Yes I think you read better than me Smiley

Thanks for the update and hopefully arduino will update soon (although they only just updated to 4.9.2 and that took a very long time)


  
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