1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
From a85c798f91bfef796116f3ebf5e5e7e479c8683f Mon Sep 17 00:00:00 2001
From: Magnus Edenhill <magnus@edenhill.se>
Date: Thu, 29 Jun 2017 10:35:23 +0200
Subject: [PATCH] configure crc32 for x32: try to avoid dead-code removal
---
configure.librdkafka | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/configure.librdkafka b/configure.librdkafka
index 903b0276..923dd48f 100644
--- a/configure.librdkafka
+++ b/configure.librdkafka
@@ -86,11 +86,13 @@ function checks {
mkl_compile_check crc32chw WITH_CRC32C_HW disable CC "" \
"
#include <inttypes.h>
+#include <stdio.h>
#define LONGx1 \"8192\"
#define LONGx2 \"16384\"
void foo (void) {
const char *n = \"abcdefghijklmnopqrstuvwxyz0123456789\";
uint64_t c0 = 0, c1 = 1, c2 = 2;
+ uint64_t s;
uint32_t eax = 1, ecx;
__asm__(\"cpuid\"
: \"=c\"(ecx)
@@ -104,6 +106,8 @@ void foo (void) {
\"crc32q\t\" LONGx2 \"(%3), %2\"
: \"=r\"(c0), \"=r\"(c1), \"=r\"(c2)
: \"r\"(n), \"0\"(c0), \"1\"(c1), \"2\"(c2));
+ s = c0 + c1 + c2;
+ printf(\"avoiding unused code removal by printing %d, %d, %d\n\", (int)s, (int)eax, (int)ecx);
}
"
|
