llvm-svn: 297064

tools/lld/ELF/Symbols.cpp:215:13: error: unused variable 'S'
[-Werror,-Wunused-variable]
  if (auto *S = dyn_cast<SharedSymbol>(this)

llvm-svn: 297063

llvm-svn: 297062

llvm-svn: 297061

also exit early on kill instead of redefinition.

Differential Revision: https://reviews.llvm.org/D30230

llvm-svn: 297060

llvm-svn: 297059

NewGVN: We were not really failing this testcase, because the instructions it was looking for are unused. GVN value numbers unused instructions, NewGVN does not.  Fix the instructions to be used, so we eliminate the redundancies it's checking for, and un-XFAIL it

llvm-svn: 297058

This was requested in PR31958 and elsewhere.

llvm-svn: 297057

David Blaikie pointed out that the `setForceChildren` API is no longer needed and should be removed from the DWARF Generator APIs.

Also the DWARFDebugInfoTest file had some copy pasted comments that are not relevant. I've removed them.

llvm-svn: 297056

llvm-svn: 297055

If a block has non-analyzable branches, the listed successors don't need
to add up to one. For example, if a block has a conditional tail call,
that tail call will not have a corresponding successor in the successor
list, but will still be a possible branch.

Differential Revision: https://reviews.llvm.org/D30556

llvm-svn: 297054

it was accessing the details of the Log class directly. Let it go
through the channel class instead.

This also discovered a bug when we were setting but not clearing the log
options when enabling a channel.

llvm-svn: 297053

llvm-svn: 297052

Before, we were producing G_INSERT instructions that were actually closer to a
cast or even a COPY when both input and output sizes are the same. This doesn't
really make sense and means that everything interpreting a G_INSERT also has to
handle all these kinds of casts.

So now we detect these degenerate cases and emit real casts instead.

llvm-svn: 297051

llvm-svn: 297050

This puts us at parity with bfd, which could already gc this case.

I noticed the sections not being gced when linking a modified freebsd
kernel. A section that was not gced and not mentioned in the linker
script would end up breaking the expected layout. Since fixing the gc
is relatively simple and an improvement, that seems better than trying
to hack the orphan placement code.

There are 173 input section in the entire link whose names are valid C
identifiers, so this is probably not too performance critical.

llvm-svn: 297049

llvm-svn: 297048

llvm-svn: 297047

llvm-svn: 297046

Use the store size of the argument type, which will be a byte-sized
quantity, rather than dividing the size in bits by 8.

Fixes PR32136 and re-enables copy elision from i64 arguments.

Reverts the workaround in from r296950.

llvm-svn: 297045

llvm-svn: 297044

llvm-svn: 297043

Now that G_INSERT instructions can only insert one register, this code was
overly general. In another direction it didn't handle registers that crossed
split boundaries properly, which needed to be fixed.

llvm-svn: 297042

llvm-svn: 297040

llvm-svn: 297039

Summary: We do not need that special handling because the debug info is more accurate now. Performance testing shows no regression on google internal benchmarks.

Reviewers: davidxl, aprantl

Reviewed By: aprantl

Subscribers: llvm-commits, aprantl

Differential Revision: https://reviews.llvm.org/D30658

llvm-svn: 297038

llvm-svn: 297037

1) Looks in Plugins and clang
2) Adds a mode to display the deps sorted by the number of times
   the deps occurs in a particular project

llvm-svn: 297036

llvm-svn: 297035

llvm-svn: 297034

Merge the tail block into the loop in cases where the main loop body
exits early, subject to profitability constraints. This will coalesce
the loop body into fewer blocks.

For example:
  loop:                           loop:
    // loop body                      // loop body
    if (...) jump exit      -->       // more body
  more:                               if (...) jump exit
    // more body                      jump loop
    jump loop

llvm-svn: 297033

The code in updateDeadFlags removed unnecessary <dead> flags, but there
can be cases where such a flag is not set, and yet a register has become
dead. For example, if a mux with identical inputs is replaced with a COPY,
the predicate register may no longer be used after that.

llvm-svn: 297032

llvm-svn: 297031

GNUMode shouldn't be a benign language option because it influences the
resulting AST when checking for the existence of GNUMode-specific macro
"linux" (e.g. by having code inside #ifdef linux). This patch marks it as a
normal language option so it gets correctly passed to the compiler invocation
for the used modules.

The added test case illustrated this because it compiles without modules, but
fails when using modules.

Patch by Raphael Isemann (D30496)!

llvm-svn: 297030

Div/rem-of-0 does not cause faults/undef (not the same as div/rem-by-0).

llvm-svn: 297029

Summary:
Until now, NamespaceEndCommentFixer was adding missing comments for every run,
which results in multiple end comments for:
```
namespace {
  int i;
  int j;
}
#if A
  int a = 1;
#else
  int a = 2;
#endif
```
result before:

```
namespace {
  int i;
  int j;
}// namespace // namespace
#if A
  int a = 1;
#else
  int a = 2;
#endif
```
result after:
```
namespace {
  int i;
  int j;
}// namespace
#if A
  int a = 1;
#else
  int a = 2;
#endif
```

Reviewers: djasper

Reviewed By: djasper

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D30659

llvm-svn: 297028

external_source_symbol attribute docs

llvm-svn: 297027

Refactoring of duplicated code and more fixes to follow.

This is motivated by the post-commit comments for r296699:
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20170306/435182.html

Ie, we can crash if we're missing obvious simplifications like this that
exist in the IR simplifier or if these occur later than expected.

The x86 change for non-splat division shows a potential opportunity to improve
vector codegen: we assumed that since only one lane had meaningful results, we
should do the math in scalar. But that means moving back and forth from vector
registers.

llvm-svn: 297026

Reviewers: klimek, djasper

Reviewed By: djasper

Subscribers: krasimir, kimgr, cfe-commits

Differential Revision: https://reviews.llvm.org/D30532

llvm-svn: 297025

NFC.

llvm-svn: 297024