This is a preliminary patch for fast instruction selection on
PowerPC. Code generation can differ between DAG isel and fast isel.
Existing tests that specify -O0 were written to expect DAG isel. Make
this explicit by adding -fast-isel=false to the tests.
In some cases specifying -fast-isel=false produces different code even
when there isn't a fast instruction selector specified. This is
because TM.Options.EnableFastISel = 1 at -O0 whether or not a FastISel
object exists. Thus disabling fast isel can actually produce less
conservative code. Because of this, some of the expected code
generation in the -O0 tests needs to be adjusted.
In particular, handling of function arguments is less conservative
with -fast-isel=false (see isOnlyUsedInEntryBlock() in
SelectionDAGBuilder.cpp). This results in fewer stack accesses and,
in some cases, reduced stack size as uselessly loaded values are no
longer stored back to spill locations in the stack.
No functional change with this patch; test case adjustments only.
llvm-svn: 183939
This pass was assuming that if hasAddressTaken() returns false for a
function, the function's only uses are call sites. That's not true
because there can be references by BlockAddresses too.
Fix the pass to handle this case. Fix
BlockAddress::replaceUsesOfWithOnConstant() to allow a function's type
to be changed by RAUW'ing the function with a bitcast of the recreated
function.
Patch by Mark Seaborn.
llvm-svn: 183933
This is in preparation for switching the clang driver over to using LLVM's
Option library. Richard Smith introduced most of these changes to the clang
driver in r167638.
Reviewers: espindola on IRC
Differential Revision: http://llvm-reviews.chandlerc.com/D970
llvm-svn: 183925
Execute's Data parameter is now optional, so we won't allocate memory
for it on Windows and we'll close the process handle.
The Unix code should probably do something similar to avoid accumulation
of zombie children that haven't been waited on.
Tested on Linux and Windows.
llvm-svn: 183906
operator<< so that functions are printed as just their name instead of as their
entire definition, which is excessively verbose in this context.
llvm-svn: 183871
It was only used to implement ExecuteAndWait and ExecuteNoWait. Expose just
those two functions and make Execute and Wait implementations details.
llvm-svn: 183864
I'm taking David Blaikie's suggestion to use an
Optional<PPC::Predicate> return value instead. That's the right
solution for this problem. Thanks for pointing out that possibility!
llvm-svn: 183858
These records are mandatory for executables and are used by the loader.
Reviewers: rafael
CC: llvm-commits
Differential Revision: http://llvm-reviews.chandlerc.com/D939
llvm-svn: 183852
This is a preparatory patch for fast-isel support. The instruction
selector will need to access some functions in PPCGenCallingConv.inc,
which in turn requires several helper functions to be defined. These
are currently defined near the only use of PCCGenCallingConv.inc,
inside PPCISelLowering.cpp. This patch moves the declaration of the
functions into the associated header file to provide the needed
visibility.
No functional change intended.
llvm-svn: 183844
Allows returning a PPC::Predicate from a function with a no-predicate
value possible. Preparatory patch for fast-isel on PPC64 ELF. No
behavioral change intended.
llvm-svn: 183841
