[RISCV] Add tests for suboptimal handling of negative constants for i32 uaddo/usubo on RV64. NFC

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We end up zero extending constants when we promote to i64. We
should sign extend instead to allow use of addiw or improve
constant materialization.

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This commit is contained in:

Craig Topper 2021-07-11 12:31:02 -07:00

parent d87e58d536

commit 51f3472bbd

1 changed files with 418 additions and 270 deletions

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test/CodeGen/RISCV/xaluo.ll

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