Even if one bit is defined, the code is not clear what it is suppose to do.
The test wants to assert that some bits are undef, but that's not what the IR does and I don't think it's even possible to do that in any meaningful way. It was added in D12497, so @reames might want to double check.
Differential Revision: https://reviews.llvm.org/D60859
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362499 91177308-0d34-0410-b5e6-96231b3b80d8
For some reason multiple places need to do this, and the variant the
loop unroller and inliner use was not handling it.
Also, introduce a new wrapper to be slightly more precise, since on
AMDGPU some addrspacecasts are free, but not no-ops.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362436 91177308-0d34-0410-b5e6-96231b3b80d8
This patch fixes a problem that occurs in LowerSwitch when a switch statement has a PHI node as its condition, and the PHI node only has two incoming blocks, and one of those incoming blocks is through an unreachable default in the switch statement. When this condition occurs, LowerSwitch holds a pointer to the condition value, but removes the switch block as a predecessor of the PHI block, causing the PHI node to be replaced. LowerSwitch then tries to use its stale pointer to the original condition value, causing a crash.
Differential Revision: https://reviews.llvm.org/D62560
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362427 91177308-0d34-0410-b5e6-96231b3b80d8
Summary: Fneg can be implemented with an xor rather than a function call so we don't need to add the function call overhead. This was pointed out in D62699
Reviewers: efriedma, cameron.mcinally
Reviewed By: efriedma
Subscribers: javed.absar, eraman, hiraditya, haicheng, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D62747
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362304 91177308-0d34-0410-b5e6-96231b3b80d8
Fix for https://bugs.llvm.org/show_bug.cgi?id=31181 and partial fix
for LFTR poison handling issues in general.
When LFTR moves a condition from pre-inc to post-inc, it may now
depend on value that is poison due to nowrap flags. To avoid this,
we clear any nowrap flag that SCEV cannot prove for the post-inc
addrec.
Additionally, LFTR may switch to a different IV that is dynamically
dead and as such may be arbitrarily poison. This patch will correct
nowrap flags in some but not all cases where this happens. This is
related to the adoption of IR nowrap flags for the pre-inc addrec.
(See some of the switch_to_different_iv tests, where flags are not
dropped or insufficiently dropped.)
Finally, there are likely similar issues with the handling of GEP
inbounds, but we don't have a test case for this yet.
Differential Revision: https://reviews.llvm.org/D60935
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362292 91177308-0d34-0410-b5e6-96231b3b80d8
Two more tests with a switch to a dynamically dead IV, with poison
occuring on the first or second iteration.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362291 91177308-0d34-0410-b5e6-96231b3b80d8
At the moment, LoopPredication completely bails out if it sees a latch of the form:
%cmp = icmp ne %iv, %N
br i1 %cmp, label %loop, label %exit
OR
%cmp = icmp ne %iv.next, %NPlus1
br i1 %cmp, label %loop, label %exit
This is unfortunate since this is exactly the form that LFTR likes to produce. So, go ahead and recognize simple cases where we can.
For pre-increment loops, we leverage the fact that LFTR likes canonical counters (i.e. those starting at zero) and a (presumed) range fact on RHS to discharge the check trivially.
For post-increment forms, the key insight is in remembering that LFTR had to insert a (N+1) for the RHS. CVP can hopefully prove that add nsw/nuw (if there's appropriate range on N to start with). This leaves us both with the post-inc IV and the RHS involving an nsw/nuw add, and SCEV can discharge that with no problem.
This does still need to be extended to handle non-one steps, or other harder patterns of variable (but range restricted) starting values. That'll come later.
Differential Revision: https://reviews.llvm.org/D62748
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362282 91177308-0d34-0410-b5e6-96231b3b80d8
When the object size argument is -1, no checking can be done, so calling the
_chk variant is unnecessary. We already did this for a bunch of these
functions.
rdar://50797197
Differential revision: https://reviews.llvm.org/D62358
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362272 91177308-0d34-0410-b5e6-96231b3b80d8
If we can determine that a saturating add/sub will not overflow based
on range analysis, convert it into a simple binary operation. This is
a sibling transform to the existing with.overflow handling.
Reapplying this with an additional check that the saturating intrinsic
has integer type, as LVI currently does not support vector types.
Differential Revision: https://reviews.llvm.org/D62703
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362263 91177308-0d34-0410-b5e6-96231b3b80d8
Noticed on D62703. LVI only handles plain integers, not vectors of
integers. This was previously not an issue, because vector support
for with.overflow is only a relatively recent addition.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362261 91177308-0d34-0410-b5e6-96231b3b80d8
If we can determine that a saturating add/sub will not overflow
based on range analysis, convert it into a simple binary operation.
This is a sibling transform to the existing with.overflow handling.
Differential Revision: https://reviews.llvm.org/D62703
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362242 91177308-0d34-0410-b5e6-96231b3b80d8
AMDGPU uses multiplier 9 for the inline cost. It is taken into account
everywhere except for inline hint threshold. As a result we are penalizing
functions with the inline hint making them less probable to be inlined
than those without the hint. Defaults are 225 for a normal function and
325 for a function with an inline hint. Currently we have effective
threshold 225 * 9 = 2025 for normal functions and just 325 for those with
the hint. That is fixed by this patch.
Differential Revision: https://reviews.llvm.org/D62707
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362239 91177308-0d34-0410-b5e6-96231b3b80d8
When we switch to opaque pointer types we will need some way to describe
how many bytes a 'byval' parameter should occupy on the stack. This adds
a (for now) optional extra type parameter.
If present, the type must match the pointee type of the argument.
The original commit did not remap byval types when linking modules, which broke
LTO. This version fixes that.
Note to front-end maintainers: if this causes test failures, it's probably
because the "byval" attribute is printed after attributes without any parameter
after this change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362128 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
I'm adding ORE to memset/memcpy formation, with tests,
but mainly this is split off from D61144.
Reviewers: reames, anemet, thegameg, craig.topper
Reviewed By: thegameg
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D62631
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362092 91177308-0d34-0410-b5e6-96231b3b80d8
Currently, only the following information is provided by LoopVectorizer
in the case when the CF of the loop is not legal for vectorization:
LV: Can't vectorize the instructions or CFG
LV: Not vectorizing: Cannot prove legality.
But this information is not enough for the root cause analysis; what is
exactly wrong with the loop should also be printed:
LV: Not vectorizing: The exiting block is not the loop latch.
Patch by Pavel Samolysov.
Reviewers: mkuper, hsaito, rengolin, fhahn
Reviewed By: fhahn
Differential Revision: https://reviews.llvm.org/D62311
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362056 91177308-0d34-0410-b5e6-96231b3b80d8
When we switch to opaque pointer types we will need some way to describe
how many bytes a 'byval' parameter should occupy on the stack. This adds
a (for now) optional extra type parameter.
If present, the type must match the pointee type of the argument.
Note to front-end maintainers: if this causes test failures, it's probably
because the "byval" attribute is printed after attributes without any parameter
after this change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362012 91177308-0d34-0410-b5e6-96231b3b80d8
Shawn Landden