GNU C Library master sources branch master updated. glibc-2.22-611-g2094350
Thu Dec 17 16:36:00 GMT 2015

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- Log -----------------------------------------------------------------;a=commitdiff;h=2094350c9c9c1b87cf34b193ad6541e4a29b62dc

commit 2094350c9c9c1b87cf34b193ad6541e4a29b62dc
Author: Adhemerval Zanella <>
Date:   Thu Dec 17 12:34:57 2015 -0200

    Fix POWER7 logb results for negative subnormals (bug 19375)
    The optimized POWER7 logb implementation does not use the absolute
    value of the word extracted from the input to apply the leading 0-bits
    builtin (to ignore the float sign).  This patch fixes it by
    clearing the signal bit in the resulting word.
    It fixes the subnormal tests failures when running on POWER7 ou
    newer chip.
    Tested on powerpc64le (POWER8).
    	[BZ# 19375]
    	* sysdeps/powerpc/power7/fpu/s_logb.c (__logb): Fix return for
    	negative subnormals.

diff --git a/ChangeLog b/ChangeLog
index 17b04cd..6cd6d72 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-12-17  Adhemerval Zanella  <>
+	* sysdeps/powerpc/power7/fpu/s_logb.c (__logb): Fix return for
+	negative subnormals.
 2015-12-16  H.J. Lu  <>
 	* sysdeps/unix/sysv/linux/x86_64/sysdep.h
diff --git a/sysdeps/powerpc/power7/fpu/s_logb.c b/sysdeps/powerpc/power7/fpu/s_logb.c
index c5feb67..abd1c2a 100644
--- a/sysdeps/powerpc/power7/fpu/s_logb.c
+++ b/sysdeps/powerpc/power7/fpu/s_logb.c
@@ -58,6 +58,7 @@ __logb (double x)
       int ma;
       EXTRACT_WORDS (ix, lx, x);
+      ix &= 0x7fffffff;
       if (ix == 0)
 	ma = __builtin_clz (lx) + 32;


Summary of changes:
 ChangeLog                           |    5 +++++
 sysdeps/powerpc/power7/fpu/s_logb.c |    1 +
 2 files changed, 6 insertions(+), 0 deletions(-)

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