On 2010-09-29 20:22, Renato Botelho wrote:
It's using drand48() instead of rand()
...
GCC libc:
ga...@botelhor:~/testes> ./test
random value 0.396465
clang libc:
ga...@botelhor:~/testes> ./test
random value -inf
Renato, Derek, could you please apply the attached patch for ldexp,
rebuild your libc (with clang), and run your random test program again?
diff --git a/lib/libc/amd64/gen/ldexp.c b/lib/libc/amd64/gen/ldexp.c
index 43107fc..ecf1ff8 100644
--- a/lib/libc/amd64/gen/ldexp.c
+++ b/lib/libc/amd64/gen/ldexp.c
@@ -36,6 +36,8 @@ static char sccsid[] = "@(#)ldexp.c 8.1 (Berkeley) 6/4/93";
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+#include <math.h>
+
/*
* ldexp(value, exp): return value * (2 ** exp).
*
@@ -49,12 +51,16 @@ __FBSDID("$FreeBSD$");
double
ldexp (double value, int exp)
{
- double temp, texp, temp2;
+ double temp, texp;
+#ifdef __clang__
+ volatile
+#endif
+ double temp2;
texp = exp;
#ifdef __GNUC__
__asm ("fscale "
- : "=u" (temp2), "=t" (temp)
- : "0" (texp), "1" (value));
+ : "=t" (temp), "=u" (temp2)
+ : "0" (value), "1" (texp));
#else
#error unknown asm
#endif
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