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Test a minimum case that crashes gcc when compiling smult_curve25519_donna_c64

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This commit is contained in:
Frank Denis
2013-09-08 02:15:12 -07:00
parent faf6f5cbc1
commit 7544cba1fa
1 changed files with 8 additions and 3 deletions
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configure.ac
+8 -3
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@@ -318,16 +318,21 @@ AC_SUBST(HAVE_AMD64_ASM_V)
AC_MSG_CHECKING(for 128-bit arithmetic)
HAVE_TI_MODE_V=0
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
]], [[
#ifndef __GNUC__
# error mode(TI) is a gcc extension
#endif
#if defined(__clang__) && !defined(__x86_64__)
# error clang doesn't properly compile smult_curve25519_donna_c64.c
#endif
#include <stdint.h>
typedef unsigned uint128_t __attribute__((mode(TI)));
uint128_t x;
(void) x;
void fcontract(uint8_t *output) {
uint128_t t[5];
t[2] += 0x8000000000000 - 1;
*((uint64_t *)(output+16)) = (t[2] >> 26) | (t[3] << 25);
}
]], [[
(void) fcontract;
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_TI_MODE], [1], [gcc TI mode is available])