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Re: PATCH: Use __builtin_clzll in 64-bit __logb
- From: Andreas Jaeger <aj at suse dot com>
- To: libc-alpha at sourceware dot org
- Date: Mon, 14 May 2012 21:13:05 +0200
- Subject: Re: PATCH: Use __builtin_clzll in 64-bit __logb
- References: <20120511122204.GA3854@intel.com>
On 05/11/2012 02:22 PM, H.J. Lu wrote:
Hi,
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),
Andreas
Thanks.
H.J.
---
* 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@{suse.com,opensuse.org} Twitter/Identica: jaegerandi
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