Unable to find a register to spill in class POINTER_REGS bug

pert · April 9, 2018, 9:41pm

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unable to find a register to spill in class 'POINTER_REGS'

opened 12:22PM - 13 Oct 15 UTC

closed 12:07PM - 17 Sep 19 UTC

I upgraded from Arduino IDE 1.0.6 to 1.6.5 and now my sketch have compile error:… unable to find a register to spill in class 'POINTER_REGS' I've narrow it down to a function (I've modified it to try to understand the compile error). Odd thing is if I remove any of the 4 line of code in the for loop, then it compiles ok. Here's the test sketch with this issue: ``` float dhistory[10]; float test; void setup() { // put your setup code here, to run once: } void loop() { // put your main code here, to run repeatedly: test = getSlope(dhistory); } float getSlope(float history[]) { float sumx = 0; float sumy = 0; float sumxy = 0; float sumxsq = 0; float rate = 0; int n = 10; for (int i=1; i< 11; i++) { sumx = sumx + i; sumy = sumy + history[i-1]; sumy = sumy + history[i-1]; sumxsq = sumxsq + (i*i); } rate = sumy+sumx+sumxsq; return rate; } ```

Also, totally the wrong forum section for this topic.

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Unable to find a register to spill in class POINTER_REGS bug

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