[llvm-bugs] [Bug 42762] unexpected codegen for inline asm

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42762

Nemanja Ivanovic <nemanja.i.ibm at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #5 from Nemanja Ivanovic <nemanja.i.ibm at gmail.com> ---
Proposed fix in https://reviews.llvm.org/D77542

Please note that this won't give you optimal codegen. Namely, we will always
use zero as the index and compute the address into the base register. However,
it will at least generate correct code.

We can revisit optimizing codegen in the future. In the meantime, you could
change something like:
void dcbz_w_offset(void* addr, int offset)
{
    asm volatile ("dcbz %y0" :: "Z"(*(unsigned char*)(addr + offset)) :
"memory");
}

into:
void dcbz_w_offset(void* addr, int offset)
{
  asm volatile ("dcbz %1, %0" :: "b"((unsigned char*)addr), "r"(offset) :
"memory");
}

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