Before, Hydrogen call instructions had uses of the PushArgument instructions
for their arguments.  These operands were unneeded, bloated the IR, and
caused calls to be the only Hydrogen instructions with an unpredictable
number of operands.

Now, PushArgument is a pure side-effecting instruction that has no uses.

Review URL: http://codereview.chromium.org/6480030

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6749 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

This change introduces an instruction for negation instead
of generating a multiplication with -1.

The code for x64 and ARM is not included in this change.


Review URL: http://codereview.chromium.org/6461021

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6748 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Review URL: http://codereview.chromium.org/6410112

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6725 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Make esi available to the register allocator rather than dedicating it
permanently to the context.

The context is still passed in register esi to JavaScript and to the runtime
as part of the calling convention.  Because some stubs might end up calling
JS or the runtime, it is also conservatively passed to stubs.

Roughly half the calls have been modified to use the context as an input
value in fixed register esi.  The other half are marked as calls or deferred
code so esi is spilled and can be explicitly set.

It is no longer necessary to restore the context to esi after a call that
might change it.

Review URL: http://codereview.chromium.org/6452001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6713 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

When constructing stack traces we interpret the deoptimization data for
optimized frames to find the receiver value.  This value could sometimes be
eliminated from the deoptimization data if we though it was unused.

BUG=v8:1118

Review URL: http://codereview.chromium.org/6465023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6694 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Each context in the context chain has a corresponding hydrogen value.
The context values are used for global object lookup and context slot
lookup.  Add simple (non-compound) assignment to context slots.

Review URL: http://codereview.chromium.org/6390003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6615 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

1. The placement of checks for negative zero has to be computed after
all conversion instructions have been inserted. I separated the code
into its own phase.

2. GVN need to take instruction flags into account when comparing
instructions for redundancy.

Review URL: http://codereview.chromium.org/6260035

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6534 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

It is a type error to treat a flag (an enum) as if it were a flag mask (an
int derived from shifting a bit by the enum value).  It is error prone to
have functions that take flag mask arguments because they will silently
accept flags.

Review URL: http://codereview.chromium.org/6373011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6500 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

The former default was true. The new default is false and the default
implementation is UNREACHABLE so it asserts in debug builds.  The function
is overridden in all concrete instruction classes that might have the flag
kUseGVN set.

Review URL: http://codereview.chromium.org/6255013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6493 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Rename HBranch (the instruction that coerces an arbitrary HValue to
control flow) to HTest to free up the term Branch to refer to any
control instruction with two successors.

Change the virtual FirstSuccessor and SecondSuccessor functions on
control instructions to a pair of data members.

Review URL: http://codereview.chromium.org/6366002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6417 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Add a generic tagged version for all bitwise operation that
invoke the generic stub. This allows us to perform generic
bitwise operations (i.e. on non-integers) without deoptimizing.

Review URL: http://codereview.chromium.org/6366006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6416 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Implement ConstantD and ConstantI.

BUG=1048

Review URL: http://codereview.chromium.org/6262005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6352 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Currently only closures which only read from the context are supported.

Review URL: http://codereview.chromium.org/5753005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6340 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

This prevents code motion from hoisting map-checks across such stores
which may result in unnecessary deoptimizations.

In the following example program we would move a map-check from the inner loop out before the outer loop which is not desirable:

function f() {
  var o = {};
  var j = 0;
  o.a = 1;
  do {
    o.b = 6;  // Map transition
    for (var i=0; i<10; i++) {
       o.a = o.b + i;
    }
  } while(++j < 1) {}
}

for (var i = 0; i < 1000000; i++) f();


Review URL: http://codereview.chromium.org/5991001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6071 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

The overflow conditions were not correctly detected for 
certain add, sub and mul instructions.

I replaced the previous code by using 64-bit arithmetic
to correctly identify overflows for *, + and -.

Review URL: http://codereview.chromium.org/5860009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6055 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5922 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5921 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5920 ce2b1a6d-e550-0410-aec6-3dcde31c8c00