Change `ConstantExpr` to follow the model the other constants are using:
only malloc a replacement if it's going to be used. This fixes a subtle
bug where if an API user had used `ConstantExpr::get()` already to
create the replacement but hadn't given it any users, we'd delete the
replacement.
This relies on r216015 to thread `OnlyIfReduced` through
`ConstantExpr::getWithOperands()`.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216016 91177308-0d34-0410-b5e6-96231b3b80d8
In order to change `ConstantExpr::replaceUsesOfWithOnConstant()` to work
like other constants (e.g., using `ConstantArray::getImpl()`), thread
`OnlyIfReduced` through as necessary. When `OnlyIfReduced` is false,
there's no functionality change. When it's true, if there's no constant
folding or type changes `nullptr` is returned instead of the new
constant.
`ConstantExpr::replaceUsesOfWithOnConstant()` will be updated to use the
"true" version in a follow-up commit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216015 91177308-0d34-0410-b5e6-96231b3b80d8
Note: This was originally reverted to track down a buildbot error. Reapply
without any modifications.
Original commit message:
FastISel didn't take much advantage of the different addressing modes available
to it on AArch64. This commit allows the ComputeAddress method to recognize more
addressing modes that allows shifts and sign-/zero-extensions to be folded into
the memory operation itself.
For Example:
lsl x1, x1, #3 --> ldr x0, [x0, x1, lsl #3]
ldr x0, [x0, x1]
sxtw x1, w1
lsl x1, x1, #3 --> ldr x0, [x0, x1, sxtw #3]
ldr x0, [x0, x1]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216013 91177308-0d34-0410-b5e6-96231b3b80d8
Note: This was originally reverted to track down a buildbot error. Reapply
without any modifications.
Original commit message:
In the large code model for X86 floating-point constants are placed in the
constant pool and materialized by loading from it. Since the constant pool
could be far away, a PC relative load might not work. Therefore we first
materialize the address of the constant pool with a movabsq and then load
from there the floating-point value.
Fixes <rdar://problem/17674628>.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216012 91177308-0d34-0410-b5e6-96231b3b80d8
Note: This was originally reverted to track down a buildbot error. Reapply
without any modifications.
Original commit message:
This mostly affects the i64 value type, which always resulted in an 15byte
mobavsq instruction to materialize any constant. The custom code checks the
value of the immediate and tries to use a different and smaller mov
instruction when possible.
This fixes <rdar://problem/17420988>.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216010 91177308-0d34-0410-b5e6-96231b3b80d8
Note: This was originally reverted to track down a buildbot error. Reapply
without any modifications.
Original commit message:
This change materializes now the value "0" from the zero register.
The zero register can be folded by several instruction, so no
materialization is need at all.
Fixes <rdar://problem/17924413>.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216009 91177308-0d34-0410-b5e6-96231b3b80d8
Note: This was originally reverted to track down a buildbot error. This commit
exposed a latent bug that was fixed in r215753. Therefore it is reapplied
without any modifications.
I run it through SPEC2k and SPEC2k6 for AArch64 and it didn't introduce any new
regeressions.
Original commit message:
This changes the order in which FastISel tries to materialize a constant.
Originally it would try to use a simple target-independent approach, which
can lead to the generation of inefficient code.
On X86 this would result in the use of movabsq to materialize any 64bit
integer constant - even for simple and small values such as 0 and 1. Also
some very funny floating-point materialization could be observed too.
On AArch64 it would materialize the constant 0 in a register even the
architecture has an actual "zero" register.
On ARM it would generate unnecessary mov instructions or not use mvn.
This change simply changes the order and always asks the target first if it
likes to materialize the constant. This doesn't fix all the issues
mentioned above, but it enables the targets to implement such
optimizations.
Related to <rdar://problem/17420988>.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216006 91177308-0d34-0410-b5e6-96231b3b80d8
Owning the buffer is somewhat inflexible. Some Binaries have sub Binaries
(like Archive) and we had to create dummy buffers just to handle that. It is
also a bad fit for IRObjectFile where the Module wants to own the buffer too.
Keeping this ownership would make supporting IR inside native objects
particularly painful.
This patch focuses in lib/Object. If something elsewhere used to own an Binary,
now it also owns a MemoryBuffer.
This patch introduces a few new types.
* MemoryBufferRef. This is just a pair of StringRefs for the data and name.
This is to MemoryBuffer as StringRef is to std::string.
* OwningBinary. A combination of Binary and a MemoryBuffer. This is needed
for convenience functions that take a filename and return both the
buffer and the Binary using that buffer.
The C api now uses OwningBinary to avoid any change in semantics. I will start
a new thread to see if we want to change it and how.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216002 91177308-0d34-0410-b5e6-96231b3b80d8
This fixes a few BuildMI callsites where the result register was added by
using addReg, which is per default a use and therefore an operand register.
Also use the zero register as result register when emitting a compare
instruction (SUBS with unused result register).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215997 91177308-0d34-0410-b5e6-96231b3b80d8
Previously, the hint mechanism relied on clean up passes to remove redundant
metadata, which still showed up if running opt at low levels of optimization.
That also has shown that multiple nodes of the same type, but with different
values could still coexist, even if temporary, and cause confusion if the
next pass got the wrong value.
This patch makes sure that, if metadata already exists in a loop, the hint
mechanism will never append a new node, but always replace the existing one.
It also enhances the algorithm to cope with more metadata types in the future
by just adding a new type, not a lot of code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215994 91177308-0d34-0410-b5e6-96231b3b80d8
* Use StringRef instead of std::string&
* Return a std::unique_ptr<Module> instead of taking an optional module to write
to (was not really used).
* Use current comment style.
* Use current naming convention.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215989 91177308-0d34-0410-b5e6-96231b3b80d8
I should have included this as part of r215986, which worked around this
corner by changing ArrayRef::equals() not to use std::equal. Alas.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215988 91177308-0d34-0410-b5e6-96231b3b80d8
This reverts commit r215981, which reverted the above commits because
MSVC std::equal asserts on nullptr iterators, and thes commits
introduced an `ArrayRef::equals()` on empty ArrayRefs.
ArrayRef was changed not to use std::equal in r215986.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215987 91177308-0d34-0410-b5e6-96231b3b80d8
MSVC's STL has a bug in `std::equal()`: it asserts on nullptr iterators,
causing a block revert in r215981. This works around that by re-writing
`ArrayRef::equals()` to do the work itself.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215986 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
This directive is similar to ".set mipsX".
It is used to change the CPU target of the assembler, enabling it to accept instructions for a specific CPU.
This patch only implements the r4000 CPU (which is treated internally as generic mips3) and the generic ISAs.
Contains work done by Matheus Almeida.
Reviewers: dsanders
Reviewed By: dsanders
Differential Revision: http://reviews.llvm.org/D4884
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215978 91177308-0d34-0410-b5e6-96231b3b80d8
Avoid creating a new `ConstantVector` on an RAUW of one of its members.
This reduces RAUW traffic on any containing constant.
This is part of PR20515.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215966 91177308-0d34-0410-b5e6-96231b3b80d8
Previously, `ConstantArray::replaceUsesOfWithOnConstant()` neglected to
check whether it becomes a `ConstantDataArray`. Call
`ConstantArray::getImpl()` to check for that.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215965 91177308-0d34-0410-b5e6-96231b3b80d8
Introduce `getImpl()` that tries the simplification logic from `get()`
and then gives up. This allows the logic to be reused elsewhere in a
follow-up commit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215963 91177308-0d34-0410-b5e6-96231b3b80d8
Avoid RAUW-ing `ConstantExpr` when an operand changes unless the new
`ConstantExpr` already has users. This prevents the RAUW from rippling
up the expression tree unnecessarily.
This commit indirectly adds test coverage for r215953 (this is how I
came across the bug).
This is part of PR20515.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215960 91177308-0d34-0410-b5e6-96231b3b80d8
Now that `ConstantAggrUniqueMap` and `ConstantUniqueMap` work the same
way, change the aggregates to use the new one.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215959 91177308-0d34-0410-b5e6-96231b3b80d8
Rewrite `ConstantUniqueMap` to be more similar to
`ConstantAggrUniqueMap`.
- Use a `DenseMap` with custom MapInfo instead of a `std::map` with
linear lookups and deletion.
- Don't waste memory explicitly storing (heavyweight) keys.
Only `ConstantExpr` and `InlineAsm` actually use this data structure, so
I also updated them to use it.
This code cleanup is a precursor to reducing RAUW traffic on
`ConstantExpr` -- I felt badly adding a new (linear) call to
`ConstantUniqueMap::FindExistingKey`, so this designs away the concern.
A follow-up commit will transition the users of `ConstantAggrUniqueMap`
over.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215957 91177308-0d34-0410-b5e6-96231b3b80d8
This code had a homemade RAUW that was incorrect when a user was a
constant: instead of calling `replaceUsersWithOnConstant()` it would
incorrectly update the operand in-place, invalidating
`LLVMContextImpl::ExprConstants`. RAUW does the job better.
The ValueHandle that `GVMap` is holding onto needs to be removed first,
so this commit also removes each variable from the map on-the-fly.
Since deletions from `ExprConstants` use a linear search that compares
directly on the pointer value (instead of using the key), there isn't an
obvious way to expose this with a testcase.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215953 91177308-0d34-0410-b5e6-96231b3b80d8
Previously all `blockaddress()` constants were treated as forward
references. They were resolved twice: once at the end of the function
in question, and again at the end of the module. Furthermore, if the
same blockaddress was referenced N times, the parser created N distinct
`GlobalVariable`s (one for each reference).
Instead, resolve all block addresses at the beginning of the function,
creating the standard `BasicBlock` forward references used for all other
basic block references. After the function, all references can be
resolved immediately. To check for the condition of parsing block
addresses from within the same function, I created a reference to the
current per-function-state in `BlockAddressPFS`.
Also, create only one forward-reference per basic block. Because
forward references to block addresses are rare, the data structure here
shouldn't matter. If somehow it does someday, this can be pretty easily
changed to a `DenseMap<std::pair<ValID, ValID>, GV>`.
This is part of PR20515.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215952 91177308-0d34-0410-b5e6-96231b3b80d8
Call `verifyModule()` after parsing and after every transformation.
Also convert some `DEBUG(dbgs())` to `errs()` to increase visibility
into what's going on.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215951 91177308-0d34-0410-b5e6-96231b3b80d8
- add check for volatile (probably unneeded, but I agree that we should be conservative about it).
- strengthen condition from isUnordered() to isSimple(), as I don't understand well enough Unordered semantics (and it also matches the comment better this way) to be confident in the previous behaviour (thanks for catching that one, I had missed the case Monotonic/Unordered).
- separate a condition in two.
- lengthen comment about aliasing and loads
- add tests in GVN/atomic.ll
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215943 91177308-0d34-0410-b5e6-96231b3b80d8
