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100435
2015 Jul 17
2
[LLVMdev] Suspicious behavior of mem2reg (promoteSingleBlockAlloca)
...ially uses the SSA
construction algorithm to promote allocas into registers, but there are
shortcuts for some special cases. One of the special cases is when an
alloca is "only used within a single basic block." (
http://llvm.org/docs/doxygen/html/PromoteMemoryToRegister_8cpp_source.html#l00435
)
But currently, I cannot understand the algorithm for this special case. In
this case, the mem2reg pass "perform[s] a single linear pass over the basic
block using the Alloca." In other words, a load is replaced by a read from
a register corresponding to the nearest preceding store....