tree b3ad27a92767b7a98852cd2152f3b079fe231747
parent 9f7f4acbf0fc42357e7c804447cb7c2468ca4f4e
author Piotr Fusik <p.fusik@samsung.com> 1748889796 +0200
committer GitHub <noreply@github.com> 1748889796 +0200
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[RISCV] Fold LI 1 / SLLI into BSETI during i64 materialization (#142348)

My first approach was to avoid emitting LI 1 / SLLI in the first place.
Unfortunately, that favors BSETI C / ADDI -1 over LI -1 / SRLI 64-C
even though the latter has both instructions compressible.
This is because the code assumes in several places that
a two-instruction sequence (here: BSETI / ADDI) cannot be improved.

Another possible approach would be to keep LI 1 / SLLI if it is to be
later replaced with SRLI. This would be harder to grasp than eventually
patching LI 1 / SLLI with BSETI.