There can be various constant pointers in the IR which do not get relocated at a safepoint. One example is the address of a global variable. Another example is a pointer created via inttoptr. Note that the optimizer itself likes to create such inttoptrs when locally propagating constants through dynamically dead code.
To deal with this, we need to exclude uses of constants from contributing to the liveness of a safepoint which might reach that use. At some later date, it might be worth exploring what could be done to support the relocation of various special types of "constants", but that's future work.
Differential Revision: http://reviews.llvm.org/D9236
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235821 91177308-0d34-0410-b5e6-96231b3b80d8
This is a follow-on to D8833 (insertps optimization when the zero mask is not used).
In this patch, we check for the case where the zmask is used, but both input vectors
to the insertps intrinsic are the same operand or the zmask overrides the destination
lane. This lets us replace the 2nd shuffle input operand with the zero vector.
Differential Revision: http://reviews.llvm.org/D9257
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235810 91177308-0d34-0410-b5e6-96231b3b80d8
Update `lib/Linker` to handle `Function` metadata attachments. The
attachments stick with the function body.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235786 91177308-0d34-0410-b5e6-96231b3b80d8
Add serialization support for function metadata attachments (added in
r235783). The syntax is:
define @foo() !attach !0 {
Metadata attachments are only allowed on functions with bodies. Since
they come before the `{`, they're not really part of the body; since
they require a body, they're not really part of the header. In
`LLParser` I gave them a separate function called from `ParseDefine()`,
`ParseOptionalFunctionMetadata()`.
In bitcode, I'm using the same `METADATA_ATTACHMENT` record used by
instructions. Instruction metadata attachments are included in a
special "attachment" block at the end of a `Function`. The attachment
records are laid out like this:
InstID (KindID MetadataID)+
Note that these records always have an odd number of fields. The new
code takes advantage of this to recognize function attachments (which
don't need an instruction ID):
(KindID MetadataID)+
This means we can use the same attachment block already used for
instructions.
This is part of PR23340.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235785 91177308-0d34-0410-b5e6-96231b3b80d8
Add a verifier check that only functions with bodies have metadata
attachments. This should help catch bugs in frontends and
transformation passes. Part of PR23340.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235784 91177308-0d34-0410-b5e6-96231b3b80d8
Add IR support for `Metadata` attachments. Assembly and bitcode support
will follow shortly, but for now we just have unit tests. This is part
of PR23340.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235783 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unused `PFS` variable and take the `Instruction` by reference.
(Not really related to PR23340, but might as well clean this up while
I'm here.)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235782 91177308-0d34-0410-b5e6-96231b3b80d8
right scaling.
In the function canFoldInAddressingMode, VT is computed as the type of the
destination/source of a LOAD/STORE operations, instead of the memory type of the
operation.
On targets with a scaling factor on the offset of the LOAD/STORE operations, the
function may return false for actually valid cases. This may then prevent the
selection of profitable pre or post indexed load/store operations, and instead
select pre or post indexed load/store for unprofitable cases.
Patch by Francois de Ferriere <francois.de-ferriere@st.com>!
Differential Revision: http://reviews.llvm.org/D9146
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235780 91177308-0d34-0410-b5e6-96231b3b80d8
Parameterize the separator for attachments, since `Function` metadata
attachments (PR23340) aren't going to use a `,` (comma). No real
functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235775 91177308-0d34-0410-b5e6-96231b3b80d8
Collect metadata names once per `AssemblyWriter` instead of every time
we need to print some attachments. Just a drive-by; this caught my eye
while I was refactoring the code in r235772.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235774 91177308-0d34-0410-b5e6-96231b3b80d8
When using bit tests for hole checks, we call AddPredecessorToBlock to give the
phi node a value from the bit test block. This would break if we've
previously called removePredecessor on the default destination because the
switch is fully covered.
Test case by Mark Lacey.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235771 91177308-0d34-0410-b5e6-96231b3b80d8
Make room for more than just `Function::isMaterializable()` in the
`GlobalObject` subclass data bitfield. Since we're treating it like a
bitfield, change `Function::Function()` to zero-out the whole thing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235770 91177308-0d34-0410-b5e6-96231b3b80d8
Extract the set logic for metadata attachments from `Instruction` so it
can be reused for `Function` (PR23340).
This data structure makes a `SmallVector<>` look (a little) like a map,
just doing the bare minimum to support the `Instruction` (and soon,
`Function`) metadata API.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235769 91177308-0d34-0410-b5e6-96231b3b80d8
This introduces an intrinsic called llvm.eh.exceptioncode. It is lowered
by copying the EAX value live into whatever basic block it is called
from. Obviously, this only works if you insert it late during codegen,
because otherwise mid-level passes might reschedule it.
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Technically the operations are different -- the old logic moved items
from the back into the opened-up slots, instead of the usual
`remove_if()` logic of a slow and a fast iterator -- but unless a
profile tells us otherwise I prefer the simpler logic here. Regardless,
there shouldn't be an observable function change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235767 91177308-0d34-0410-b5e6-96231b3b80d8
Rename `MetadataStore` to the more explicit `InstructionMetadata`. This
will make room for `FunctionMetadata` (start of PR23340).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235763 91177308-0d34-0410-b5e6-96231b3b80d8
Same as r235145 for the call instruction - the justification, tradeoffs,
etc are all the same. The conversion script worked the same without any
false negatives (after replacing 'call' with 'invoke').
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235755 91177308-0d34-0410-b5e6-96231b3b80d8
AsmPrinter owns the OutStreamer, so an owning pointer makes sense here. Using a
reference for this is crufty.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235752 91177308-0d34-0410-b5e6-96231b3b80d8
In CMake dependencies can be filenames or targets, and targets can't be filenames. The Ninja generator handles filename dependencies because it generates targets for every output file from a command. For example:
add_custom_command(OUTPUT foo.txt COMMAND touch foo.txt)
With the Ninja generator this generates a target foo.txt, but with the Makefile generator it doesn't. This is probably because Ninja explicitly requires these hard dependency ties, and Make just behaves oddly in general.
To fix this we need to make the tablegen actions depend on a target rather than a filename.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235732 91177308-0d34-0410-b5e6-96231b3b80d8
Check that `@main` is calling `@foo2` (the renamed internal function),
not the `@foo` with external linkage that's been pulled in from the
override file.
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