[mips] Add checks for alignment and maximum displacements for most of the
branch instructions for mips and micromips instruction sets thus avoiding
the situation of generating branches to undesired locations if offsets
cannot be encoded.

This patch also checks if a fixup cannot be applied and returns a fatal error
if that's the case.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197223 91177308-0d34-0410-b5e6-96231b3b80d8
Enabling thumb2 mode used to force support for armv6t2. Replace this
with a temporary assertion and adjust the various test cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197224 91177308-0d34-0410-b5e6-96231b3b80d8
X86: When lowering shl_parts, don't emit shift amounts larger than the bit width.

While it's safe for the X86-specific shift nodes, dag combining will
kill generic nodes. Insert an AND to make it safe, isel will nuke it
as x86's shift instructions have an implicit AND.

Fixes PR16108, which contains a contraption to hit this case in between
constant folders.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197228 91177308-0d34-0410-b5e6-96231b3b80d8
[SystemZ] Make more use of LTGFR

InstCombine turns (sext (trunc)) into (ashr (shl)), then converts any
comparison of the ashr against zero into a comparison of the shl against zero.
This makes sense in itself, but we want to undo it for z, since the sign-
extension instruction has a CC-setting form.

I've included tests for both the original and InstCombined variants,
but the former already worked.  The patch fixes the latter.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197234 91177308-0d34-0410-b5e6-96231b3b80d8
[SystemZ] Add a structure to represent a selected comparison

...in an attempt to rein back the increasingly complex selection code.
A knock-on effect is that ICmpType is exposed from the outset, which
slightly simplifies adjustSubwordCmp.

The code is no piece of art even after this change, but at least it should
be slightly better.  No behavioral change intended.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197235 91177308-0d34-0410-b5e6-96231b3b80d8
[SystemZ] Extend integer absolute selection

This patch makes more use of LPGFR and LNGFR.  It builds on top of
the LTGFR selection from r197234.  Most of the tests are motivated
by what InstCombine would produce.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197236 91177308-0d34-0410-b5e6-96231b3b80d8
test commit.
Amend a comment.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197237 91177308-0d34-0410-b5e6-96231b3b80d8
[SystemZ] Make more use of TMHH

This originally came about after noticing that InstCombine turns
some of the TMHH (icmp (and...), ...) tests into plain comparisons.
Since there is no instruction to compare with a 64-bit immediate,
TMHH is generally better than an ordered comparison for the cases
that it can handle.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197238 91177308-0d34-0410-b5e6-96231b3b80d8
[SystemZ] Optimize X [!=]= Y in cases where X - Y or Y - X is also computed

In those cases it's better to compare the result of the subtraction
against zero.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197239 91177308-0d34-0410-b5e6-96231b3b80d8
Fix pr18235.

The cpp backend is not a reasonable fallback for a missing target. It is a
very special backend, so it is reasonable to use it only if explicitly
requested.

While at it, simplify the interface a bit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197241 91177308-0d34-0410-b5e6-96231b3b80d8
Assume defaults to produce smaller datalayout strings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197249 91177308-0d34-0410-b5e6-96231b3b80d8
[AArch64] Simplify the Neon Scalar3Same patterns for floating-point reciprocal
step, floating-point reciprocal square root step, floating-point absolute
difference, and integer/floating-point compare instructions.  Also, move the
scalar general arithmetic operation patterns closer to similar code.  No
functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197250 91177308-0d34-0410-b5e6-96231b3b80d8
Convert liveness tracking to work on a sub-register level instead of just register units.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197253 91177308-0d34-0410-b5e6-96231b3b80d8
Liveness Analysis Pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197254 91177308-0d34-0410-b5e6-96231b3b80d8
Grow the stackmap/patchpoint format to hold 64-bit IDs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197255 91177308-0d34-0410-b5e6-96231b3b80d8
Use a: and s: instead of a0: and s0: in the DataLayout strings.

They are equivalent and the size of 'a' and 's' is unused.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197259 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Liveness Analysis Pass"

This reverts commit r197254.

This was an accidental merge of Juergen's patch. It will be checked in
shortly, but wasn't meant to go in quite yet.

Conflicts:
	include/llvm/CodeGen/StackMaps.h
	lib/CodeGen/StackMaps.cpp
	test/CodeGen/X86/stackmap-liveness.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197260 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Convert liveness tracking to work on a sub-register level instead of just register units."

This reverts commit r197253.

This was a great change, but Juergen should be the commit author.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197262 91177308-0d34-0410-b5e6-96231b3b80d8
[block-freq] Add the APInt method extractBit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197271 91177308-0d34-0410-b5e6-96231b3b80d8
[block-freq] Add the method APInt::nearestLogBase2().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197272 91177308-0d34-0410-b5e6-96231b3b80d8