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Ran 23 Mar 2018 10:13PM UTC

Files 34

Run time 8min

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Committed 23 Mar 2018 10:10PM UTC coverage: 87.07% (+0.02%) from 87.048%

Job # COMPILER=g++ C_COMPILER=gcc BUILD_TYPE=Coverage

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push

travis-ci

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web-flow

Commit Message

Add tests to verify assembler output -- Fix DoNotOptimize. (#530)

* Add tests to verify assembler output -- Fix DoNotOptimize.

For things like `DoNotOptimize`, `ClobberMemory`, and even `KeepRunning()`,
it is important exactly what assembly they generate. However, we currently
have no way to test this. Instead it must be manually validated every
time a change occurs -- including a change in compiler version.

This patch attempts to introduce a way to test the assembled output automatically.
It's mirrors how LLVM verifies compiler output, and it uses LLVM FileCheck to run
the tests in a similar way.

The tests function by generating the assembly for a test in CMake, and then
using FileCheck to verify the // CHECK lines in the source file are found
in the generated assembly.

Currently, the tests only run on 64-bit x86 systems under GCC and Clang,
and when FileCheck is found on the system.

Additionally, this patch tries to improve the code gen from DoNotOptimize.
This should probably be a separate change, but I needed something to test.

* Disable assembly tests on Bazel for now

* Link FIXME to github issue

* Fix Tests on OS X

* fix strip_asm.py to work on both Linux and OS X like targets

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1495 of 1717 relevant lines covered (87.07%)

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