Commit Graph

8 Commits

Author SHA1 Message Date
Andrew Trick
3228cc259b Added SCEV::NoWrapFlags to manage unsigned, signed, and self wrap
properties.
Added the self-wrap flag for SCEV::AddRecExpr.
A slew of temporary FIXMEs indicate the intention of the no-self-wrap flag
without changing behavior in this revision.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127590 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-14 16:50:06 +00:00
Dan Gohman
46ffb231c6 Disable the asserts that check that normalization is perfectly
invertible. ScalarEvolution's folding routines don't always succeed
in canonicalizing equal expressions to a single canonical form, and
this can cause these asserts to fail, even though there's no actual
correctness problem. This fixes PR8066.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113021 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-03 22:12:56 +00:00
Dan Gohman
fc3678a346 Fix SCEV denormalization of expressions where the exit value from
one loop is involved in the increment of an addrec for another
loop. This fixes rdar://8168938.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108863 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-20 17:06:20 +00:00
Dan Gohman
b7391fadff Change an argument from an Instruction* to a Value*, which is all
that is needed here.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108850 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-20 16:34:50 +00:00
Dan Gohman
082d6b6536 Minor code cleanups.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108848 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-20 16:32:11 +00:00
Dan Gohman
fb272ad614 Minor code simplification.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108793 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-20 00:57:18 +00:00
Dan Gohman
c87b40b1cd Fix normalization and de-normalization of non-affine SCEVs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105480 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-04 19:16:34 +00:00
Dan Gohman
448db1cdef Generalize IVUsers to track arbitrary expressions rather than expressions
explicitly split into stride-and-offset pairs. Also, add the
ability to track multiple post-increment loops on the same expression.

This refines the concept of "normalizing" SCEV expressions used for
to post-increment uses, and introduces a dedicated utility routine for
normalizing and denormalizing expressions.

This fixes the expansion of expressions which are post-increment users
of more than one loop at a time. More broadly, this takes LSR another
step closer to being able to reason about more than one loop at a time.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100699 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-07 22:27:08 +00:00