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242fbc0df6
The PR shows that when cfgrtl.cc:duplicate_insn_chain attempts to
update the MR_DEPENDENCE_CLIQUE information for a MEM_EXPR we can end up
accidentally dropping (e.g.) an ARRAY_REF from the MEM_EXPR and end up
replacing it with the underlying MEM_REF. This leads to an
inconsistency in the MEM_EXPR information, and could lead to wrong code.
While the walk down to the MEM_REF is necessary to update
MR_DEPENDENCE_CLIQUE, we should use the outer tree expression for the
MEM_EXPR. This patch does that.
gcc/ChangeLog:
PR rtl-optimization/114924
* cfgrtl.cc (duplicate_insn_chain): When updating MEM_EXPRs,
don't strip (e.g.) ARRAY_REFs from the final MEM_EXPR.
(cherry picked from commit fe40d52561)
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