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In the case where op = add, y = base_ptr, and x = offset, this transform: (op y, (op x, c1)) -> (op (op x, y), c1) breaks the canonical form of add by putting the base pointer in the second operand and the offset in the first. This fix is important for the R600 target, because for some address spaces the base pointer and the offset are stored in separate register classes. The old pattern caused the ISel code for matching addressing modes to put the base pointer and offset in the wrong register classes, which required no-trivial code transformations to fix. llvm-svn: 262148 |
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