Nemanja Ivanovic 0464586ac5 [PowerPC] Combine 64-bit bswap(load) without LDBRX ...

When targeting CPUs that don't have LDBRX, we end up producing code that is
very inefficient and large for this common idiom. This patch just
optimizes it two 32-bit LWBRX instructions along with a merge.

This fixes https://bugs.llvm.org/show_bug.cgi?id=49610

Differential revision: https://reviews.llvm.org/D104836

2021-06-24 15:11:47 -05:00

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