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lib: sbi_scratch: Optimize hartid and scratch lookup

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The compiler generates much better code for sbi_hartindex_to_hartid()
and sbi_hartindex_to_scratch() when using a constant for the bounds
check. This works out nicely because the underlying arrays are already
a constant size, so the only change needed is to fill the remainder of
each array with the appropriate default/out-of-bounds value. The
ellipsis in the designated initializer is a GCC extension (also
supported by Clang), but avoids runtime initialization of the array.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Samuel Holland
2025-02-20 10:42:28 -08:00
committed by Anup Patel
parent ef4ed2dda7
commit 6b97950cf5
2 changed files with 5 additions and 5 deletions
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6
include/sbi/sbi_scratch.h
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@@ -226,7 +226,7 @@ extern u32 hartindex_to_hartid_table[];
/** Get sbi_scratch from HART index */
#define sbi_hartindex_to_hartid(__hartindex) \
({ \
((__hartindex) <= sbi_scratch_last_hartindex()) ?\
((__hartindex) < SBI_HARTMASK_MAX_BITS) ? \
hartindex_to_hartid_table[__hartindex] : -1U; \
})
@@ -236,8 +236,8 @@ extern struct sbi_scratch *hartindex_to_scratch_table[];
/** Get sbi_scratch from HART index */
#define sbi_hartindex_to_scratch(__hartindex) \
({ \
((__hartindex) <= sbi_scratch_last_hartindex()) ?\
hartindex_to_scratch_table[__hartindex] : NULL;\
((__hartindex) < SBI_HARTMASK_MAX_BITS) ? \
hartindex_to_scratch_table[__hartindex] : NULL; \
})
/**