[PATCH] D30751: [MachineCopyForwarding] Add new pass to do register COPY forwarding at end of register allocation.

[Hal Finkel via Phabricator via llvm-commits]

hfinkel added a comment.

High-level question: Why does the register allocator not do this on its own?



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Comment at: test/CodeGen/PowerPC/fma-mutate.ll:17
 ; CHECK: @foo3
-; CHECK: xsnmsubadp [[REG:[0-9]+]], {{[0-9]+}}, [[REG]]
+; CHECK: fmr [[REG:[0-9]+]], [[REG2:[0-9]+]]
+; CHECK: xsnmsubadp [[REG]], {{[0-9]+}}, [[REG2]]
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Is this an improvement?


https://reviews.llvm.org/D30751