pzhengqc e48916f615 [ARM][ConstantIslands] Correct MinNoSplitDisp calculation (#114590) ...

MinNoSplitDisp was first introduced in D16890 to handle cases where the
ConstantIslands pass fails to converge in the presence of big basic
blocks. However, the computation of the variable seems to be wrong as it
currently computes the offset immediately following UserBB. In other
words, it represents the distance from the beginning of the function to
the end of UserBB. The distance from the beginning of the function does
not seem to be a good indicator of how big the basic block is unless the
basic block is close to the beginning of the function. I think
MinNoSplitDisp should compute the distance between UserOffset and the
end of UserBB instead.

2024-12-14 10:14:50 -08:00

95 KiB

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