[llvm-commits] [PATCH] fix infinite loop in instcombine with more than 4GB memcpy

[Michael Liao]

Hi

Please review the patch fixing a possible infinite loop in instcombine
if memcpy size is larger than 4GB. The root cause is that memcpy size is
wrongly truncated into 32-bit instead of 64-bit.

The other changes includes replacing 0-checking with assertion as
0-sized memcpy/set is already removed in visitCallInst before calling
into memcpy/set simplification. The other reason is that returning the
same inst won't cause memcpy/set removed as they are not trivially dead
inst.

Test case is revised.

Yours
- Michael

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