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Author SHA1 Message Date
Sanjoy Das b174f9a316 [SCEV] Reapply 'Teach isLoopBackedgeGuardedByCond to exploit trip counts' 
Summary:
If the trip count of a specific backedge is `N`, then we know that
backedge is effectively guarded by the condition `{0,+,1} u< N`.  This
change teaches SCEV to use this condition to prove things in
`isLoopBackedgeGuardedByCond`.

Depends on D12948
Depends on D12949

The original checkin, r248608 had to be backed out due to an issue with
a ObjCXX unit test.  That issue is now fixed, so re-landing.

Reviewers: atrick, reames, majnemer, hfinkel

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D12950

llvm-svn: 248638
 2015-09-25 23:53:50 +00:00
Sanjoy Das 4a39b97671 Revert two SCEV changes that caused test failures in clang. 
r248606: "[SCEV] Exploit A < B => (A+K) < (B+K) when possible"
r248608: "[SCEV] Teach isLoopBackedgeGuardedByCond to exploit trip counts."
llvm-svn: 248614
 2015-09-25 21:16:50 +00:00
Sanjoy Das d706fa8a0c [SCEV] Teach isLoopBackedgeGuardedByCond to exploit trip counts. 
Summary:
If the trip count of a specific backedge is `N`, then we know that
backedge is effectively guarded by the condition `{0,+,1} u< N`.  This
change teaches SCEV to use this condition to prove things in
`isLoopBackedgeGuardedByCond`.

Depends on D12948
Depends on D12949

Reviewers: atrick, reames, majnemer, hfinkel

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D12950

llvm-svn: 248608
 2015-09-25 19:59:57 +00:00
Sanjoy Das f257452986 [SCEV] Add a `scalar-evolution-print-constant-ranges' option 
Summary:
Unused in this commit, but will be used in a subsequent change (D8142)
by a FileCheck test.

Reviewers: atrick

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8143

llvm-svn: 231708
 2015-03-09 21:43:39 +00:00
Bill Wendling dc17270968 FileCheckize some of the testcases. 
llvm-svn: 187756
 2013-08-05 23:43:18 +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 52e14d2272 Add a testcase for PR4569, which is now fixed. 
llvm-svn: 76526
 2009-07-21 00:50:52 +00:00