https://bugs.llvm.org/show_bug.cgi?id=46037
Bug ID: 46037
Summary: [LICM with cfl-aa=both] wrong code
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Global Analyses
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org
Created attachment 23521
--> https://bugs.llvm.org/attachment.cgi?id=23521&action=edit
reduced testcase
clang -O3 -march=z13 tc_cfl-aa.i -o ./a.out -w ; ./a.out
checksum = 4
$LLVM_BUILD/bin/clang -O3 -march=z13 tc_cfl-aa.i -o ./a.out -w -mllvm
-use-cfl-aa=both; ./a.out
checksum = 0
The reduced test program should print '4'.
It seems that LICM is hoisting the load of @d_ptr which seems wrong since @PtoP
is a pointer to pointer which alters @d_ptr before @d_ptr is derefenced.
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