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AArch64: Use b.cond instead of cbz/cbnz when all register are used up #5737

Merged
merged 1 commit into from
Jan 6, 2021
Merged

AArch64: Use b.cond instead of cbz/cbnz when all register are used up #5737

merged 1 commit into from
Jan 6, 2021

Commits on Jan 6, 2021

  1. AArch64: Use b.cond instead of cbz/cbnz when all register are used up 

    `ificmpeq` and its variant nodes have 3 children and the third child is
`GlRegDeps` whose children are `aRegLoad`/`iRegLoad`/`PassThrough` of global registers.
In some cases, `GlRegDeps` node uses all the allocatable integer registers.
If this happens, we cannot use `cbz`/`cbnz` instruction for branch
because `cbz`/`cbnz` requires a register in addition to those global registers.
This commit changes `ificmpHelper` to use `b.cond` instruction for that case.

Signed-off-by: Akira Saitoh <saiaki@jp.ibm.com>
    Akira Saitoh committed Jan 6, 2021
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