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31713943aa
My commit rL216160 introduced a bug PR21014: IndVars widens code 'for (i = ; i < ...; i++) arr[ CONST - i]' into 'for (i = ; i < ...; i++) arr[ i - CONST]' thus inverting index expression. This patch fixes it. Thanks to Jörg Sonnenberger for pointing. Differential Revision: http://reviews.llvm.org/D5576 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218867 91177308-0d34-0410-b5e6-96231b3b80d8
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