http://llvm.org/bugs/show_bug.cgi?id=7529
Summary: Missing memoperands prevents ARM load/store folding in
a few cases
Product: libraries
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Revision 107114 changed the ARMLoadStoreOptimizer pass to not touch loads and
stores with missing memoperands. When there is no memoperand to say otherwise,
the memory access could be unaligned or volatile.
This caused a small change in code generation - 0.2% of ldms and 0.1% of stms
lost across the nightly test suite.
We should check why those loads and stores had no memoperands, and if we are
missing some possible optimizations.
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