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  • #1354

Loop unrolling sub-optimal in presence of some labels

ID0001100: This issue was created automatically from Mantis Issue 1100. Further discussion may take place here.


Id Project Category View Due Date Updated
ID0001100 Frama-C Kernel public 2012-02-18 2014-02-12
Reporter yakobowski Assigned To yakobowski Resolution fixed
Priority low Severity minor Reproducibility always
Platform - OS - OS Version -
Product Version Frama-C Nitrogen-20111001 Target Version - Fixed in Version Frama-C Oxygen-20120901

Description :

Repro case : -------------------p.c--------------- void main () { int x = 0; L: while(x < 4) { x++; } }

frama-c -ulevel 2 -print p.c results in

void main(void) { int x; x = 0; if (! (x < 4)) { goto unrolling_2_loop; } x ++; unrolling_4_loop: /* internal / ; if (! (x < 4)) { goto unrolling_2_loop; } x ++; unrolling_3_loop: / internal / ; L: while (x < 4) { x ++; } unrolling_2_loop: / internal */ ; return; }

The loop is unrolled before the label L. This is not incorrect per se, and even seems to be ok inside 'switch'. However, this will rarely be what the user expects and needs.

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