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module/zfs: simplify ddt_stat_add() loop 

LLVM's Polly (ISL to be precise) is unhappy with the loop from
ddt_stat_add():

  CC [M]  fs/zfs/zfs/ddt.o
../lib/External/isl/isl_schedule_node.c:2470: cannot insert node
between set or sequence node and its filter children

(building with the custom patch which adds Polly support to Kbuild)

The mentioned loop is rather suboptimal. All that we need is to just
treat ddt_stat_t as an array of u64 and perform 1:1 addition or
substraction. This can be done in simpler for-loop with the
determined index and bounds. Compiler will expand d_end - d into
a number of ddt_stat_t fields at compile time.
This prevents Polly from failing on this file.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Lobakin <alobakin@pm.me>
Closes #12253
This commit is contained in:
Alexander 2021-06-29 16:26:11 +02:00 committed by GitHub
parent 5b7053a9a5
commit 6a19dea7f6
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1 changed files with 2 additions and 2 deletions
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module/zfs/ddt.c
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@ -423,8 +423,8 @@ ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg)
ASSERT(neg == 0 || neg == -1ULL); /* add or subtract */
while (d < d_end)
*d++ += (*s++ ^ neg) - neg;
for (int i = 0; i < d_end - d; i++)
d[i] += (s[i] ^ neg) - neg;
}
static void