Do not share a single unknown val# for all the live ranges merged into a physical sub-register live interval. When coalescer is merging in clobbered virtaul register live interval into a physical register live interval, give each virtual register val# a separate val# in the physical register live interval. Otherwise, the coalescer would have lost track of the definitions   information it needs to make correct coalescing decisions.

llvm-svn: 70026

f64 types.  This is not used for anything yet.

llvm-svn: 70006

This particular one is undefined behavior (although this
isn't related to the crash), so it will no longer do it
at compile time, which seems better.

llvm-svn: 69990

between registers and the stack may be required with the APCS ABI, but it
isn't tied to using a particular version of the ARM architecture.

llvm-svn: 69978

chained and "flagged" together.  I also made a few changes to handle the
chain and flag values more consistently.  I found these problems by
inspection so I'm not aware of anything that breaks because of them
(thus no testcase).

llvm-svn: 69977

should be bit-converted to i32, it is sufficient to list only i32 in
subsequent definitions.

llvm-svn: 69973

very elegant, but neither is the tls specification :-(

llvm-svn: 69968

llvm-svn: 69967

ISD::VECTOR_SHUFFLE now stores an array of integers representing the shuffle
mask internal to the node, rather than taking a BUILD_VECTOR of ConstantSDNodes
as the shuffle mask.  A value of -1 represents UNDEF.

In addition to eliminating the creation of illegal BUILD_VECTORS just to 
represent shuffle masks, we are better about canonicalizing the shuffle mask,
resulting in substantially better code for some classes of shuffles.

A clean up of x86 shuffle code, and some canonicalizing in DAGCombiner is next.

llvm-svn: 69952

use ISD::EXTRACT_ELEMENT. SelectionDAG has a special fast-path for
the cast of an EXTRACT_ELEMENT with a BUILD_PAIR operand, for the
common case.

llvm-svn: 69948

llvm-svn: 69946

utility function.

llvm-svn: 69937

but this change makes the code more general and easier to adapt for
new purposes.

llvm-svn: 69935

llvm-svn: 69934

llvm-svn: 69919

llvm-svn: 69918

with the persistent insertion point, and change IndVars to make
use of it. This fixes a bug where IndVars was holding on to a
stale insertion point and forcing the SCEVExpander to continue to
use it.

This fixes PR4038.

llvm-svn: 69892

Banksel immediate constant will always immediately follow the GA/ES, so scan an insn from beginnin to find out the banksel operand.

llvm-svn: 69883

whitespace in the same file.

llvm-svn: 69870

memory operand tuples. This doesn't ever come up in normal
code however.

llvm-svn: 69848

llvm-svn: 69844

llvm-svn: 69842

llvm-svn: 69836

llvm-svn: 69816

llvm-svn: 69809

instructions in order to avoid inserting new ones. However, if
the cast instruction is the SCEVExpander's InsertPt, this
causes subsequently emitted instructions to be inserted near
the cast, and not at the location of the original insert point.
Fix this by adjusting the insert point in such cases.
This fixes PR4009.

llvm-svn: 69808

to better handle inserting instructions at the end of a block.

llvm-svn: 69807

Make the function begin label start after ther data pointer.
The address of data frame for function can be obtained by subtracting 2 from the function begin label.

llvm-svn: 69801

Real fix for PR3549, by using caching for predecessor counts in addition to the predecessors themselves.  This halves the time
to optimize the testcase, beyond what my previous patch did.

llvm-svn: 69792

Use PredIteratorCache in LCSSA, which gives a 37% overall speedup on the testcase from PR3549.  More improvements to come.

llvm-svn: 69788

llvm-svn: 69752

practical benefit in the case of ScalarEvolution, and it's otherwise
a nuisance.

llvm-svn: 69749

This fixes a very subtle bug. vr defined by an implicit_def is allowed overlap with any register since it doesn't actually modify anything. However, if it's used as a two-address use, its live range can be extended and it can be spilled. The spiller must take care not to emit a reload for the vn number that's defined by the implicit_def. This is both a correctness and performance issue.

llvm-svn: 69743

type to truncate to should be the number of bits of the value that are
preserved, not the number that are clobbered with sign-extension.
This fixes regressions in ldecod.

llvm-svn: 69704

llvm-svn: 69680

Patch by Jay Foad!

llvm-svn: 69679

Patch by Jay Foad!

llvm-svn: 69678

Spotted by gcc-4.5.

llvm-svn: 69673

This fixes PR4002.

llvm-svn: 69672

llvm-svn: 69665