Use pop_back_val instead of back followed by pop_back.

llvm-svn: 122876

Use a worklist for later iterations just like ordinary instsimplify. The next
step is to only process instructions in subloops if they have been modified by
an earlier simplification.

llvm-svn: 1228

Use a worklist for later iterations just like ordinary instsimplify. The next
step is to only process instructions in subloops if they have been modified by
an earlier simplification.

llvm-svn: 122869

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Change LoopInstSimplify back to a LoopPass. It revisits subloops rather than
skipping them, but it should probably use a worklist and only revisit those
instructions in subloops that have actually ch

Change LoopInstSimplify back to a LoopPass. It revisits subloops rather than
skipping them, but it should probably use a worklist and only revisit those
instructions in subloops that have actually changed. It should probably also
use a worklist after the first iteration like instsimplify now does. Regardless,
it's only 0.3% of opt -O2 time on 403.gcc if it replaces the instcombine placed
in the middle of the loop passes.

llvm-svn: 122868

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Switch to the new style of asterisk placement.

llvm-svn: 122815

Address most of Duncan's review comments. Also, make LoopInstSimplify a simple
FunctionPass. It probably doesn't have a reason to be a LoopPass, as it will
probably drop the simple fixed point and ei

Address most of Duncan's review comments. Also, make LoopInstSimplify a simple
FunctionPass. It probably doesn't have a reason to be a LoopPass, as it will
probably drop the simple fixed point and either use RPO iteration or Duncan's
approach in instsimplify of only revisiting instructions that have changed.

The next step is to preserve LoopSimplify. This looks like it won't be too hard,
although the pass manager doesn't actually seem to respect when non-loop passes
claim to preserve LCSSA or LoopSimplify. This will have to be fixed.

llvm-svn: 122791

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Add a new loop-instsimplify pass, with the intention of replacing the instance
of instcombine that is currently in the middle of the loop pass pipeline. This
commit only checks in the pass; it will h

Add a new loop-instsimplify pass, with the intention of replacing the instance
of instcombine that is currently in the middle of the loop pass pipeline. This
commit only checks in the pass; it will hopefully be enabled by default later.

llvm-svn: 122719

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