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authorSangjin Han <sangjin@eecs.berkeley.edu>2017-06-02 05:07:46 +0000
committerThomas Monjalon <thomas@monjalon.net>2017-06-05 15:10:31 +0200
commitbbdb7136652ab80a77e9e3231b06dc63c5cd686b (patch)
tree22fb3cace7b837cd63aeefc236f7ed4239d1587f /lib/librte_lpm
parent62a0e941b5000fec02dc3bd3efed092b809ce570 (diff)
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lpm: fix build with gcc -O0 option
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>
Diffstat (limited to 'lib/librte_lpm')
-rw-r--r--lib/librte_lpm/rte_lpm_sse.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/librte_lpm/rte_lpm_sse.h b/lib/librte_lpm/rte_lpm_sse.h
index ef33c6a..5f2c4d4 100644
--- a/lib/librte_lpm/rte_lpm_sse.h
+++ b/lib/librte_lpm/rte_lpm_sse.h
@@ -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;