On Mon, Jul 31, 2023 at 05:27:33PM -0400, Sean Anderson wrote: > Since ARMv5, the clz instruction allows for efficient implementation of > ffs/fls with builtins. Until ARMv7 (with Thumb-2), this instruction is > only available in ARM mode. LTO makes it difficult to force specific > functions to be in ARM mode, as it is effectively a form of very > aggressive inlining. To work around this, fls/ffs are implemented in > assembly for ARMv5 and ARMv6 when compiling U-Boot in Thumb mode. > Overall, this saves around 75 bytes per call. > > Signed-off-by: Sean Anderson <sean.ander...@seco.com>
I'll add some wording about when this was synced from the kernel when applying. Reviewed-by: Tom Rini <tr...@konsulko.com> -- Tom
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