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PATCH: Use __builtin_clzll in 64-bit __logb
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: GNU C Library <libc-alpha at sourceware dot org>
- Date: Fri, 11 May 2012 05:22:04 -0700
- Subject: PATCH: Use __builtin_clzll in 64-bit __logb
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
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?
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);