Commit Graph

13 Commits

Author SHA1 Message Date
Nick Lewycky 3155552461 Reapply r140979 with fix! We never did get a testcase, but careful review of the
logic by David Meyer revealed this bug.

llvm-svn: 140992
2011-10-03 07:10:45 +00:00
Nick Lewycky b1dbce1406 Revert r140979 due to reports of bootstrap failure.
llvm-svn: 140980
2011-10-03 05:14:59 +00:00
Nick Lewycky 3c624b8d0d Add one more case we compute a max trip count.
llvm-svn: 140979
2011-10-03 01:03:57 +00:00
Nick Lewycky b1438c763a Revert r139126 due to selfhost failures reported by buildbots.
llvm-svn: 139130
2011-09-06 02:43:13 +00:00
Nick Lewycky c4c43fbb07 Teach SCEV to report a max backedge count in one interesting case in
HowFarToZero; the case for a canonical loop.

llvm-svn: 139126
2011-09-05 23:25:16 +00:00
Dan Gohman f7495f286a When analyzing loop exit conditions combined with and and or, don't
make any assumptions about when the two conditions will agree on when
to permit the loop to exit. This fixes PR7845.

llvm-svn: 110758
2010-08-11 00:12:36 +00:00
Dan Gohman 80386c10d4 -disable-output is no longer needed with -analyze.
llvm-svn: 94574
2010-01-26 19:25:59 +00:00
Dan Gohman bc694918cc Use WriteAsOperand instead of getName() to print loop header names,
so that unnamed blocks are handled.

llvm-svn: 93059
2010-01-09 18:17:45 +00:00
Dan Gohman 1880092722 Change tests from "opt %s" to "opt < %s" so that opt doesn't see the
input filename so that opt doesn't print the input filename in the
output so that grep lines in the tests don't unintentionally match
strings in the input filename.

llvm-svn: 81537
2009-09-11 18:01:28 +00:00
Dan Gohman 9737a63ed8 Change these tests to feed the assembly files to opt directly, instead
of using llvm-as, now that opt supports this.

llvm-svn: 81226
2009-09-08 16:50:01 +00:00
Dan Gohman 463d3407e2 Loosen up the regex for this test so that it doesn't implicitly
depend on TargetData information.

llvm-svn: 79491
2009-08-19 23:19:36 +00:00
Dan Gohman 7227bc88f0 When printing a SCEVUnknown with pointer type, don't print an
artificial "ptrtoint", as it tends to clutter up complicated
expressions. The cast operators now print both source and
destination types, which is usually sufficient.

llvm-svn: 70554
2009-05-01 17:02:22 +00:00
Dan Gohman 2b8da35f9d Extend ScalarEvolution's getBackedgeTakenCount to be able to
compute an upper-bound value for the trip count, in addition to
the actual trip count. Use this to allow getZeroExtendExpr and
getSignExtendExpr to fold casts in more cases.

This may eventually morph into a more general value-range
analysis capability; there are certainly plenty of places where
more complete value-range information would allow more folding.

llvm-svn: 70509
2009-04-30 20:47:05 +00:00