From 0f47d29912b0e3d0e387db715a16b7b4f273f389 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 19 Mar 2020 21:15:42 +0100
Subject: [SERVER] crc32: Fix compile with optimizations

Should have tested in "Release" mode I guess.
Seems we're at about 24x performance this way, so hooray.
---
 src/shared/crc32.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/shared')

diff --git a/src/shared/crc32.c b/src/shared/crc32.c
index 50f476a..098615f 100644
--- a/src/shared/crc32.c
+++ b/src/shared/crc32.c
@@ -508,7 +508,7 @@ static const uint32_t crc_table[TBLS][256] =
  *  V. Gopal, E. Ozturk, et al., 2009, http://intel.ly/2ySEwL0
  */
 static uint32_t
-__attribute__((target("pclmul")))
+__attribute__((target("pclmul,sse4.1")))
 crc32pclmul(uint32_t crc, const uint8_t *buf, size_t len)
 {
     /*
@@ -676,7 +676,7 @@ uint32_t crc32(crc, buf, len)
 #if defined(__x86_64__) || defined(__amd64__)
     static  atomic_int pclmul = -1;
     if (pclmul == -1) {
-        pclmul = __builtin_cpu_supports("pclmul");
+        pclmul = __builtin_cpu_supports("pclmul") && __builtin_cpu_supports("sse4.1");
     }
     if (pclmul && len >= PCLMUL_MIN_LEN) {
         c = crc32pclmul(c, buf, len & ~PCLMUL_ALIGN_MASK);
-- 
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