SerializedPtrID, followed by the *differences* in IDs. The big idea is that
most IDs will be just be 1 off from the previous (either that or NULL, which
we encode as a difference if 0), so this will greatly reduce the encoding
space for extra IDs to just 1 bit per pointer.
So far this optimization reduces serialization of Carbon.h by only 1%, but
we aren't using any abbreviations now in the Bitcode file to properly take
advantage of this optimization.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44199 91177308-0d34-0410-b5e6-96231b3b80d8
When a live interval is being spilled, rather than creating short, non-spillable
intervals for every def / use, split the interval at BB boundaries. That is, for
every BB where the live interval is defined or used, create a new interval that
covers all the defs and uses in the BB.
This is designed to eliminate one common problem: multiple reloads of the same
value in a single basic block. Note, it does *not* decrease the number of spills
since no copies are inserted so the split intervals are *connected* through
spill and reloads (or rematerialization). The newly created intervals can be
spilled again, in that case, since it does not span multiple basic blocks, it's
spilled in the usual manner. However, it can reuse the same stack slot as the
previously split interval.
This is currently controlled by -split-intervals-at-bb.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44198 91177308-0d34-0410-b5e6-96231b3b80d8
is disabled in the sense that it will refuse to create one from a UDiv
instruction, until the code is better tested.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44163 91177308-0d34-0410-b5e6-96231b3b80d8
deserialize objects if BatchReadOwnedPtrs was called more than once in the
same call chain then the second call would overwrite the SerializedPtrIDs
being used by the first call. Solved this problem by making the vector that
holds the pointer IDs local to a function call. Now BatchReadOwnedPtrs is
reentrant.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44152 91177308-0d34-0410-b5e6-96231b3b80d8
the deserializer.
Fixed assertion when "stream jumping" in the deserializer to properly function
when we have reached the end of the stream.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44124 91177308-0d34-0410-b5e6-96231b3b80d8
in favour of teaching CCAssignToStack that size 0 and/or align
0 means to use the ABI values. This seems a neater solution.
It is safe since no legal value type has size 0.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44107 91177308-0d34-0410-b5e6-96231b3b80d8
MachineOperand auxInfo. Previous clunky implementation uses an external map
to track sub-register uses. That works because register allocator uses
a new virtual register for each spilled use. With interval splitting (coming
soon), we may have multiple uses of the same register some of which are
of using different sub-registers from others. It's too fragile to constantly
update the information.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44104 91177308-0d34-0410-b5e6-96231b3b80d8
from a file containing Function/BasicBlock pairings. This is not safe against
anonymous or abnormally-named Funcs or BBs.
Make bugpoint use this interface to pass the BBs list to the child bugpoint.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44101 91177308-0d34-0410-b5e6-96231b3b80d8
