Make PRE actually handle critical edges (by splitting them).  Confirmed that bootstrap passes with this change.

llvm-svn: 53762

llvm-svn: 53761

llvm-svn: 53760

llvm-svn: 53757

heat death of the universe, fixing an O(N^2) problem in the
size of a basic block.

llvm-svn: 53749

Fix a leak that this turned up in LowerSubregs.cpp.
And, comment a leak in LiveIntervalAnalysis.cpp.

llvm-svn: 53746

PseudoSourceValue values, which never have names. Use getName()
for all other values, because we want to print just a short summary
of the value, not the entire instruction.

llvm-svn: 53738

llvm-svn: 53735

llvm-svn: 53734

more than once.

llvm-svn: 53731

llvm-svn: 53730

mask.  These are just indices into the shuffled vector
so their type is unrelated to the type of the
shuffled elements (which is what was being used before).
This fixes vec_shuffle-11.ll when using LegalizeTypes.
What seems to have happened is that Dan's recent change
r53687, which corrected the result type of the shuffle,
somehow caused LegalizeTypes to notice that the mask
operand was a BUILD_VECTOR with a legal type but elements
of an illegal type (i64).  LegalizeTypes legalized this
by introducing a new BUILD_VECTOR of i32 and bitcasting
it to the old type.  But the mask operand is not supposed
to be a bitcast but a straight BUILD_VECTOR of constants,
causing a crash.

llvm-svn: 53729

replacement of multiple values. This is slightly more efficient
than doing multiple ReplaceAllUsesOfValueWith calls, and theoretically
could be optimized even further. However, an important property of this
new function is that it handles the case where the source value set and
destination value set overlap. This makes it feasible for isel to use
SelectNodeTo in many very common cases, which is advantageous because
SelectNodeTo avoids a temporary node and it doesn't require CSEMap
updates for users of values that don't change position.

Revamp MorphNodeTo, which is what does all the work of SelectNodeTo, to
handle operand lists more efficiently, and to correctly handle a number
of corner cases to which its new wider use exposes it.

This commit also includes a change to the encoding of post-isel opcodes
in SDNodes; now instead of being sandwiched between the target-independent
pre-isel opcodes and the target-dependent pre-isel opcodes, post-isel
opcodes are now represented as negative values. This makes it possible
to test if an opcode is pre-isel or post-isel without having to know
the size of the current target's post-isel instruction set.

These changes speed up llc overall by 3% and reduce memory usage by 10%
on the InstructionCombining.cpp testcase with -fast and -regalloc=local.

llvm-svn: 53728

only missing ppc long double operations: FNEG
and FP_EXTEND.

llvm-svn: 53723

llvm-svn: 53722

it is breaking Darwin bootstrap due to missing
functionality.

llvm-svn: 53721

llvm-svn: 53720

llvm-svn: 53719

llvm-svn: 53716

llvm-svn: 53715

atomic operation to the new one.

llvm-svn: 53714

llvm-svn: 53713

llvm-svn: 53712

llvm-svn: 53705

Mark function used by asm block as used, otherwise optimizer may not see the use and may delete the function.

llvm-svn: 53692

could cause problems for memdep when it breaks critical edges.

llvm-svn: 53691

llvm-svn: 53689

llvm-svn: 53688

was turned up by some new SelectionDAG assertion checks that I'm
working on.

llvm-svn: 53687

and AssertSext.  Needed when passing huge integer
parameters with the zeroext or signext attributes.

llvm-svn: 53684

llvm-svn: 53681

llvm-svn: 53680

FindInsertedValue, it now performs a number of simple transformations that
should result in the same effect when applied iteratively.

llvm-svn: 53673

While this is not a wonderful organizing principle, it
does make it easy to find routines, and clear where to
insert new ones.

llvm-svn: 53672

llvm-svn: 53671

also use *idx_begin in the same expression, giving unpredictable results.

This fixes this bug: http://lists.cs.uiuc.edu/pipermail/llvmdev/2008-July/015877.html

llvm-svn: 53670

llvm-svn: 53666

llvm-svn: 53661

llvm-svn: 53660

llvm-svn: 53639