This is the mail archive of the mailing list for the glibc project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: PATCH: Use __builtin_clzll in 64-bit __logb

On 05/11/2012 02:22 PM, H.J. Lu wrote:

X32 uses 64-bit math function.  But its long is 32bit.  64-bit __logb
should use __builtin_clzll instead of __builtin_clzl.  Testd on Linux/x32
and Linux/x86-64.  OK to install?

HJ, you filed bz # 14103 for this. Please add the number to ChangeLog, to NEWS and mark it as resolved (the same applies for 14104),



	* sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c (__logb): Replace
	__builtin_clzl with __builtin_clzll.

diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c
index 474eeef..185dd05 100644
--- a/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c
+++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c
@@ -36,7 +36,7 @@ __logb (double x)
      return x * x;
    if (__builtin_expect (ex == 0, 0))
-      int m = (ix == 0) ? 0 : __builtin_clzl (ix);
+      int m = (ix == 0) ? 0 : __builtin_clzll (ix);
        return -1022.0 + (double)(11 -m);
    return (double) (ex - 1023);

 Andreas Jaeger aj@{,} Twitter/Identica: jaegerandi
  SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
   GF: Jeff Hawn,Jennifer Guild,Felix Imendörffer,HRB16746 (AG Nürnberg)
    GPG fingerprint = 93A3 365E CE47 B889 DF7F  FED1 389A 563C C272 A126

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]