3
98%
master: 98%

Ran 19 Aug 2019 06:27AM UTC

Files 244

Run time 21s

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Committed 19 Aug 2019 06:14AM UTC coverage: 97.996% (-0.005%) from 98.001%

Job # NAME="unix coverage build and tests"

Build Type

push

travis-ci

Committed by

dpgeorge

Commit Message

py/nlr: Use MP_UNREACHABLE at the end of arch-specific nlr_jump funcs.

Recent versions of gcc perform optimisations which can lead to the
following code from the MP_NLR_JUMP_HEAD macro being omitted:

    top->ret_val = val; \
    MP_NLR_RESTORE_PYSTACK(top); \
    *_top_ptr = top->prev; \

This is noticeable (at least) in the unix coverage on x86-64 built with gcc
9.1.0.  This is because the nlr_jump function is marked as no-return, so
gcc deduces that the above code has no effect.

Adding MP_UNREACHABLE tells the compiler that the asm code may branch
elsewhere, and so it cannot optimise away the code.

Run Details

18481 of 18859 relevant lines covered (98.0%)

367603.19 hits per line

micropython / micropython / 11144 / 3
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master: 98%

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