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Author SHA1 Message Date
Mehdi Amini 044cb34bdc Revert "Revert "This patch builds on top of D13378 to handle constant condition."" 
This reverts commit r249528 and reapply r249431. The fix for the
fallout has been commited in r249575.

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 249581
 2015-10-07 18:14:25 +00:00
James Molloy 47efaeb36e Revert "This patch builds on top of D13378 to handle constant condition." 
This reverts commit r249431. This caused failures in sqlite3: http://lab.llvm.org:8011/builders/clang-native-arm-lnt/builds/14453

llvm-svn: 249528
 2015-10-07 09:03:34 +00:00
Mehdi Amini cf2513b352 This patch builds on top of D13378 to handle constant condition. 
With this patch, clang -O3 optimizes correctly providing > 1000x speedup on this artificial benchmark):

for (a=0; a<n; a++)
    for (b=0; b<n; b++)
        for (c=0; c<n; c++)
            for (d=0; d<n; d++)
                for (e=0; e<n; e++)
                    for (f=0; f<n; f++)
                        x++;
From test-suite/SingleSource/Benchmarks/Shootout/nestedloop.c

Reviewers: sanjoyd

Differential Revision: http://reviews.llvm.org/D13390

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 249431
 2015-10-06 17:19:20 +00:00