Matt Arsenault 24f14993e8 GlobalISel: Combine g_extract with g_merge_values ...

Try to use the underlying source registers.

This enables legalization in more cases where some irregular
operations are widened and others narrowed.

This seems to make the test_combines_2 AArch64 test worse, since the
MERGE_VALUES has multiple uses. Since this should be required for
legalization, a hasOneUse check is probably inappropriate (or maybe
should only be used if the merge is legal?).

llvm-svn: 353121

2019-02-04 23:41:59 +00:00

9.3 KiB

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