11144
98%

Ran 19 Aug 2019 06:27AM UTC

Jobs 1

Files 244

Run time 22s

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Build # 11144

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

Jobs

ID	Job ID	Ran	Files	Coverage
3	11144.3 (NAME="unix coverage build and tests")	19 Aug 2019 06:27AM UTC	0	98.0	Travis Job 11144.3

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