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lpm: fix build with gcc -O0 option

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When rte_lpm.h is used on x86, -O0 option (no optimization at all)
given to gcc causes a compile error like this:

error: the last argument must be an 8-bit immediate
   i24 = _mm_srli_si128(i24, sizeof(uint64_t));

-O0 option is useful for debugging and code coverage measurement, but
this error prevents DPDK programs from building. This patch replaces
"sizeof(uint64_t)" with a constant literal "8" to work around the issue.
The issue occurs on gcc/g++ versions from 4.8 to 5.

Signed-off-by: Sangjin Han <sangjin@eecs.berkeley.edu>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
This commit is contained in:
Sangjin Han 2017-06-02 05:07:46 +00:00 committed by Thomas Monjalon
parent 62a0e941b5
commit bbdb713665
1 changed files with 2 additions and 1 deletions
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lib/librte_lpm/rte_lpm_sse.h
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@ -78,7 +78,8 @@ rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
/* extract values from tbl24[] */
idx = _mm_cvtsi128_si64(i24);
i24 = _mm_srli_si128(i24, sizeof(uint64_t));
/* With -O0 option, gcc 4.8 - 5.4 fails to fold sizeof() into a constant */
i24 = _mm_srli_si128(i24, /* sizeof(uint64_t) */ 8);
ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
tbl[0] = *ptbl;