[llvm] [CodeGenPrepare] Make sure instruction get from SunkAddrs is before MemoryInst (PR #139303)
via llvm-commits
llvm-commits at lists.llvm.org
Fri May 9 11:20:45 PDT 2025
https://github.com/weiguozhi created https://github.com/llvm/llvm-project/pull/139303
Function optimizeBlock may do optimizations on a block for multiple times. In the first iteration of the loop, MemoryInst1 may generate a sunk instruction and store it into SunkAddrs. In the second iteration of the loop, MemoryInst2 may use the same address and then it can reuse the sunk instruction stored in SunkAddrs, but MemoryInst2 may be before MemoryInst1 and the corresponding sunk instruction. In order to avoid use before def error, we need to move the sunk instruction before MemoryInst2.
It fixes issue 138208.
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