Fix for PR10293
Michele Scandale
michele.scandale at gmail.com
Sat May 4 05:00:52 PDT 2013
Hi everybody,
here I propose a patch for PR 10293, related to loop rotate and missing hoisting
of loop invariant code.
http://llvm.org/bugs/show_bug.cgi?id=10293
For the case listed in the bug report the proposed solution solve the problem
because the loop rotation is performed instead of latch simplification, making
the block that contains the instruction the new loop header. This condition
allows to hoist the 'load' instruction because now it dominates all the exit
blocks so is guaranteed to be executed.
The patch postpones the call to 'simplifyLoopLatch' after the effective
loop-rotation to handle those cases where the rotation may fail.
Thanks in advance.
Michele Scandale
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