This pass performs if-conversion on SSA form machine code by
speculatively executing both sides of the branch and using a cmov
instruction to select the result. This can help lower the number of
branch mispredictions on architectures like x86 that don't have
predicable instructions.
The current implementation is very aggressive, and causes regressions on
mosts tests. It needs good heuristics that have yet to be implemented.
llvm-svn: 159694
IntegersSubsetMapping
- Replaced type of Items field from std::list with std::map. In neares future I'll test it with DenseMap and do the correspond replacement
if possible.
llvm-svn: 159659
some, and allows the routine to be inlined into common callers. The
various bits that hit this code in their hotpath seem slightly lower on
the profile, but I can't really measure a performance improvement as
everything seems to still be bottlenecked on likely cache misses. =/
llvm-svn: 159648
- execute_external should be;
- Not on Win32.
- Using bash.
In reverse, "execute_internal" shoud be (Win32 && !bash).
- lit.getBashPath() behaves differently before and after tweaking $PATH.
I will add a few explanations there later.
llvm-svn: 159641
inlineasm-cnstrnt-bad-r-1.ll is NOT supposed to fail, so it was removed. This resulted in the removal of a negative test (inlineasm-cnstrnt-bad-r-1.ll)
llvm-svn: 159625
It appears to have caught a use-after-free introduced as by r159567
and/or friends which call 'addPass' from many more places. The bug in
'addPass' doesn't appear to be new, and was spotted by inspection when
ASan shown a bright light of a stacktrace at these functions.
Hopefully this will fix the ASan failure -- I have no test case other
than running an ASan-built clang over the test suite.
llvm-svn: 159614
inlineasm-cnstrnt-bad-r-1.ll is NOT supposed to fail, so it was removed. This resulted in the removal of a negative test (inlineasm-cnstrnt-bad-r-1.ll)
llvm-svn: 159610
in the abstraction for lit test suites so that the various other layers
of abstraction pick up the same behavioral fix, and so that we still get
a complete list of dependencies for the 'check-all' target.
This should fix the follow-on issues of the same nature with various
other build targets, including Clang targets. Sorry for the churn, and
again thanks to Matt for testing and breaking this more thoroughly.
llvm-svn: 159593
No functionality changed here, except that the CMake installed by
default on Ubuntu Lucid should actually work with the makefile
generators now.
Thanks to Matt for the report and head-desking required to figure out
why it was failing.
llvm-svn: 159588
'|&' bash syntax. We have lots of users with a bash on their system
which doesn't support this syntax, and as bash is still significantly
faster, we should support them.
The test suite has already been updated to cope with this.
llvm-svn: 159580
This is still a work in progress but I believe it is currently good enough
to fix PR13122 "Need unit test driver for codegen IR passes". For example,
you can run llc with -stop-after=loop-reduce to have it dump out the IR after
running LSR. Serializing machine-level IR is not yet supported but we have
some patches in progress for that.
The plan is to serialize the IR to a YAML file, containing separate sections
for the LLVM IR, machine-level IR, and whatever other info is needed. Chad
suggested that we stash the stop-after pass in the YAML file and use that
instead of the start-after option to figure out where to restart the
compilation. I think that's a great idea, but since it's not implemented yet
I put the -start-after option into this patch for testing purposes.
llvm-svn: 159570
This is a preliminary step toward having TargetPassConfig be able to
start and stop the compilation at specified passes for unit testing
and debugging. No functionality change.
llvm-svn: 159567
My last checkin was apparently not the branch I intended. It was missing one change (added by chandlerc), and contained a spurious change.
llvm-svn: 159548
another mechanical change accomplished though the power of terrible Perl
scripts.
I have manually switched some "s to 's to make escaping simpler.
While I started this to fix tests that aren't run in all configurations,
the massive number of tests is due to a really frustrating fragility of
our testing infrastructure: things like 'grep -v', 'not grep', and
'expected failures' can mask broken tests all too easily.
Essentially, I'm deeply disturbed that I can change the testsuite so
radically without causing any change in results for most platforms. =/
llvm-svn: 159547
