On Sun, Jul 1, 2012 at 5:03 PM, Søren Sandman <sandm...@cs.au.dk> wrote:
> From: Søren Sandmann Pedersen <s...@redhat.com>
>
> When compiling with -O0, gcc doesn't understand that in
>
> signed char x = 0;
>
> ...
>
> asm ("...",
> : "K" (x));
>
> x is constant. Fix this by using an immediate constant instead of a
> variable.
> ---
> configure.ac | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index 2b9d1ba..36f423e 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -351,12 +351,11 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
> int main () {
> __m64 v = _mm_cvtsi32_si64 (1);
> __m64 w;
> - signed char x = 0;
>
> /* Some versions of clang will choke on K */
> asm ("pshufw %2, %1, %0\n\t"
> : "=y" (w)
> - : "y" (v), "K" (x)
> + : "y" (v), "K" (5)
> );
>
> return _mm_cvtsi64_si32 (v);
> --
> 1.7.10.4
Seems like the smart thing to me.
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