[Sparc] Rewrite MBB's live-in registers for leaf functions. Also, add
register i7 as a live-in if current function's return address is taken.

This revision fixes PR16269.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187433 91177308-0d34-0410-b5e6-96231b3b80d8
MI Sched fix: assert "Disconnected LRG within the scheduling region."

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MI Sched: Track live-thru registers.

When registers must be live throughout the scheduling region, increase
the limit for the register class. Once we exceed the original limit,
they will be spilled, and there's no point further reducing pressure.

This isn't a perfect heuristics but avoids a situation where the
scheduler could become trapped by trying to achieve the impossible.

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whitespace

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Down-scale slot index distance to save bits.

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Remove dead code.

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[mips] Define "bal" as a pseudo instruction. Also, fix bug in the InstAlias that
turns "bal" into "bgezal".



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Implement getUniqueID for directories on windows.

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This test may have been sensitive to the ARM ABI...

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[mips] Delete instruction format for "bal".



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187443 91177308-0d34-0410-b5e6-96231b3b80d8
Change behavior of calling bitcasted alias functions.

It will now only convert the arguments / return value and call
the underlying function if the types are able to be bitcasted.
This avoids using fp<->int conversions that would occur before.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187444 91177308-0d34-0410-b5e6-96231b3b80d8
isKnownToBeAPowerOfTwo: Strengthen isKnownToBeAPowerOfTwo's analysis on add instructions

Call into ComputeMaskedBits to figure out which bits are set on both add
operands and determine if the value is a power-of-two-or-zero or not.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187445 91177308-0d34-0410-b5e6-96231b3b80d8
Remove isCastable since nothing uses it now

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Add capability for building with -gsplit-dwarf to the cmake build.

In limited testing this seems to work. Caveat emptor.

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Revert "Remove isCastable since nothing uses it now"

Apparently dragonegg uses it.

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Respect address space sizes in isEliminableCastPair.

This avoids constant folding bitcast/ptrtoint/inttoptr combinations
that have illegal bitcasts between differently sized address spaces.

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Make sure that -gsplit-dwarf isn't passed to the linker.

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Make these just inline, not static inline.

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Reflow this to be easier to read.

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Preserve fast-math flags when folding (fsub x, (fneg y)) to (fadd x, y).


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