From 0574bcd71d10f0c73383fa1e5b5a7211abbb7159 Mon Sep 17 00:00:00 2001
From: xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e>
Date: Tue, 30 Mar 2010 12:20:10 +0000
Subject: [PATCH] Determine endianness at run-time
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1303 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
---
test/c/sha1.c | 44 +++++++++++++++++++++++---------------------
1 file changed, 23 insertions(+), 21 deletions(-)
diff --git a/test/c/sha1.c b/test/c/sha1.c
index 4f85590a4..7ea413a79 100644
--- a/test/c/sha1.c
+++ b/test/c/sha1.c
@@ -5,14 +5,6 @@
#include <stdio.h>
#include <stdlib.h>
-#if defined(__ppc__) || defined(__PPC__)
-#define ARCH_BIG_ENDIAN
-#elif defined(__i386__) || defined(__x86_64__) || defined(__ARMEL__)
-#undef ARCH_BIG_ENDIAN
-#else
-#error "unknown endianness"
-#endif
-
typedef unsigned int u32;
struct SHA1Context {
@@ -26,22 +18,24 @@ struct SHA1Context {
#define rol5(x) (((x) << 5) | ((x) >> 27))
#define rol30(x) (((x) << 30) | ((x) >> 2))
+static int arch_big_endian;
+
static void SHA1_copy_and_swap(void * src, void * dst, int numwords)
{
-#ifdef ARCH_BIG_ENDIAN
- memcpy(dst, src, numwords * sizeof(u32));
-#else
- unsigned char * s, * d;
- unsigned char a, b;
- for (s = src, d = dst; numwords > 0; s += 4, d += 4, numwords--) {
- a = s[0];
- b = s[1];
- d[0] = s[3];
- d[1] = s[2];
- d[2] = b;
- d[3] = a;
+ if (arch_big_endian) {
+ memcpy(dst, src, numwords * sizeof(u32));
+ } else {
+ unsigned char * s, * d;
+ unsigned char a, b;
+ for (s = src, d = dst; numwords > 0; s += 4, d += 4, numwords--) {
+ a = s[0];
+ b = s[1];
+ d[0] = s[3];
+ d[1] = s[2];
+ d[2] = b;
+ d[3] = a;
+ }
}
-#endif
}
#define F(x,y,z) ( z ^ (x & (y ^ z) ) )
@@ -225,6 +219,14 @@ static void do_bench(int nblocks)
int main(int argc, char ** argv)
{
+ /* Determine endianness */
+ union { int i; unsigned char b[4]; } u;
+ u.i = 0x12345678;
+ switch (u.b[0]) {
+ case 0x12: arch_big_endian = 1; break;
+ case 0x78: arch_big_endian = 0; break;
+ default: printf("Cannot determine endianness\n"); return 2;
+ }
do_test(test_input_1, test_output_1);
do_test(test_input_2, test_output_2);
do_bench(1000000);
--
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