We used to combine "sext(setcc x, y, cc) -> (select (setcc x, y, cc), -1, 0)"
Instead, we should combine to (select (setcc x, y, cc), T, 0) where the value
of T is 1 or -1, depending on the type of the setcc, and getBooleanContents()
for the type if it is not i1.
This fixes PR28504.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277371 91177308-0d34-0410-b5e6-96231b3b80d8
As it turns out, modref queries are broken with CFLAA. Specifically,
the data source we were using for determining modref behaviors
explicitly ignores operations on non-pointer values. So, it wouldn't
note e.g. storing an i32 to an i32* (or loading an i64 from an i64*).
It also ignores external function calls, rather than acting
conservatively for them.
(N.B. These operations, where necessary, *are* tracked by CFLAA; we just
use a different mechanism to do so. Said mechanism is relatively
imprecise, so it's unlikely that we can provide reasonably good modref
answers with it as implemented.)
Patch by Jia Chen.
Differential Revision: https://reviews.llvm.org/D22978
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277366 91177308-0d34-0410-b5e6-96231b3b80d8
Currently, CFLAnders assumes that values it hasn't seen don't alias
anything. This patch fixes that. Given that the only way for this to
happen is to query AA, rely on specific transformations happening, then
query AA again (looking for a specific set of queries), lit testing is a
bit difficult. If someone really wants a test, I'm happy to add one.
Patch by Jia Chen.
Differential Revision: https://reviews.llvm.org/D22981
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277362 91177308-0d34-0410-b5e6-96231b3b80d8
Scavenging slots were only reserved when pseudo-instruction expansion in
frame lowering created new virtual registers. It is possible to still
need a scavenging slot even if no virtual registers were created, in cases
where the stack is large enough to overflow instruction offsets.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277355 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
Allocating an AFGR64 shadows two GPR32's instead of just one.
This fixes an LNT regression detected by our internal buildbots.
Reviewers: sdardis
Subscribers: dsanders, sdardis, llvm-commits
Differential Revision: https://reviews.llvm.org/D23012
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277348 91177308-0d34-0410-b5e6-96231b3b80d8
Using RAUW was wrong here; if we have a switch transform such as:
18 -> 6 then
6 -> 0
If we use RAUW, while performing the second transform the *transformed* 6
from the first will be also replaced, so we end up with:
18 -> 0
6 -> 0
Found by clang stage2 bootstrap; testcase added.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277332 91177308-0d34-0410-b5e6-96231b3b80d8
The branch relaxation pass is computing the wrong offsets because it assumes
TLSDESC_CALLSEQ eats up 4 bytes, when in fact it is lowered to an instruction
sequence taking up 16 bytes. This can become a problem in huge files with lots
of TLS accesses, as it may slowly move branch targets out of the range computed
by the branch relaxation pass.
Fixes PR24234 https://llvm.org/bugs/show_bug.cgi?id=24234
Differential Revision: https://reviews.llvm.org/D22870
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277331 91177308-0d34-0410-b5e6-96231b3b80d8
It looks like the two independent parts of the rotate operation (a lshr and shl) are being reordered on some bots. Add CHECK-DAGs to account for this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277329 91177308-0d34-0410-b5e6-96231b3b80d8
If a switch is sparse and all the cases (once sorted) are in arithmetic progression, we can extract the common factor out of the switch and create a dense switch. For example:
switch (i) {
case 5: ...
case 9: ...
case 13: ...
case 17: ...
}
can become:
if ( (i - 5) % 4 ) goto default;
switch ((i - 5) / 4) {
case 0: ...
case 1: ...
case 2: ...
case 3: ...
}
or even better:
switch ( ROTR(i - 5, 2) {
case 0: ...
case 1: ...
case 2: ...
case 3: ...
}
The division and remainder operations could be costly so we only do this if the factor is a power of two, and emit a right-rotate instead of a divide/remainder sequence. Dense switches can be lowered significantly better than sparse switches and can even be transformed into lookup tables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277325 91177308-0d34-0410-b5e6-96231b3b80d8
Initialize all AArch64-specific passes in the TargetMachine so they can be run
by llc. This can lead to conflicts in opt with some command line options that
share the same name as the pass, so I took this opportunity to do some cleanups:
* rename all relevant command line options from "aarch64-blah" to
"aarch64-enable-blah" and update the tests accordingly
* run clang-format on their declarations
* move all these declarations to a common place (the TargetMachine) as opposed
to having them scattered around (AArch64BranchRelaxation and
AArch64AddressTypePromotion were the only offenders)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277322 91177308-0d34-0410-b5e6-96231b3b80d8
Had to update a stack folding test to clobber the other 16 registers since this now made them get used instead of spilling.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277321 91177308-0d34-0410-b5e6-96231b3b80d8
No bots have yelled yet, but this test references an x86 intrinsic.
Also, it invokes llc on x86 IR.
Fixup to r277315.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277316 91177308-0d34-0410-b5e6-96231b3b80d8
When extracting a set of blocks make sure to inherit all of the target
dependent attributes to make sure that the function will be valid for
lowering. One example is the "target-features" attribute for x86, if the
extracted region has functionality that relies on a specific feature it
will fail to be lowered.
This also allows for extracted functions to be valid for inlining, at
least back into the parent function, as the target attributes are tested
when inlining for compatibility.
Patch by River Riddle!
Differential Revision: https://reviews.llvm.org/D22713
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277315 91177308-0d34-0410-b5e6-96231b3b80d8
