diff --git a/sysdeps/powerpc/power7/fpu/s_logb.c b/sysdeps/powerpc/fpu/s_logb.c
similarity index 56%
rename from sysdeps/powerpc/power7/fpu/s_logb.c
rename to sysdeps/powerpc/fpu/s_logb.c
index 4cddc0f9c1..364f7f0cc3 100644
--- a/sysdeps/powerpc/power7/fpu/s_logb.c
+++ b/sysdeps/powerpc/fpu/s_logb.c
@@ -1,4 +1,4 @@
-/* logb(). PowerPC/POWER7 version.
+/* Get exponent of a floating-point value.  PowerPC version.
    Copyright (C) 2012-2019 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,59 +16,49 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <math.h>
-#include <math_private.h>
-#include <math_ldbl_opt.h>
-#include <libm-alias-double.h>
+/* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make
+   generic implementation faster.  */
+#if defined(_ARCH_PWR8) || !defined(_ARCH_PWR7)
+# include <sysdeps/ieee754/dbl-64/s_logb.c>
+#else
+# include <math.h>
+# include <math_private.h>
+# include <math_ldbl_opt.h>
+# include <libm-alias-double.h>
 
 /* This implementation avoids FP to INT conversions by using VSX
    bitwise instructions over FP values.  */
-
-static const double two1div52 = 2.220446049250313e-16;	/* 1/2**52  */
-static const double two10m1   = -1023.0;		/* 2**10 -1  */
-
-/* FP mask to extract the exponent.  */
-static const union {
-  unsigned long long mask;
-  double d;
-} mask = { 0x7ff0000000000000ULL };
-
 double
 __logb (double x)
 {
   double ret;
 
-  if (__builtin_expect (x == 0.0, 0))
+  if (__glibc_unlikely (x == 0.0))
     /* Raise FE_DIVBYZERO and return -HUGE_VAL[LF].  */
-    return -1.0 / __builtin_fabs (x);
+    return -1.0 / fabs (x);
 
-  /* ret = x & 0x7ff0000000000000;  */
-  asm (
-    "xxland %x0,%x1,%x2\n"
-    "fcfid  %0,%0"
-    : "=f" (ret)
-    : "f" (x), "f" (mask.d));
-  /* ret = (ret >> 52) - 1023.0;  */
-  ret = (ret * two1div52) + two10m1;
-  if (__builtin_expect (ret > -two10m1, 0))
+  /* Mask to extract the exponent.  */
+  asm ("xxland %x0,%x1,%x2\n"
+       "fcfid  %0,%0"
+       : "=d" (ret)
+       : "d" (x), "d" (0x7ff0000000000000ULL));
+  ret = (ret * 0x1p-52) - 1023.0;
+  if (ret > 1023.0)
     /* Multiplication is used to set logb (+-INF) = INF.  */
     return (x * x);
-  else if (__builtin_expect (ret == two10m1, 0))
+  else if (ret == -1023.0)
     {
       /* POSIX specifies that denormal numbers are treated as
          though they were normalized.  */
-      int32_t lx, ix;
-      int ma;
-
-      EXTRACT_WORDS (ix, lx, x);
-      ix &= 0x7fffffff;
-      if (ix == 0)
-	ma = __builtin_clz (lx) + 32;
-      else
-	ma = __builtin_clz (ix);
-      return (double) (-1023 - (ma - 12));
+      int64_t ix;
+      EXTRACT_WORDS64 (ix, x);
+      ix &= UINT64_C (0x7fffffffffffffff);
+      return (double) (-1023 - (__builtin_clzll (ix) - 12));
     }
   /* Test to avoid logb_downward (0.0) == -0.0.  */
   return ret == -0.0 ? 0.0 : ret;
 }
+# ifndef __logb
 libm_alias_double (__logb, logb)
+# endif
+#endif
diff --git a/sysdeps/powerpc/power7/fpu/s_logbf.c b/sysdeps/powerpc/fpu/s_logbf.c
similarity index 67%
rename from sysdeps/powerpc/power7/fpu/s_logbf.c
rename to sysdeps/powerpc/fpu/s_logbf.c
index b0d006b5c7..cf564ad294 100644
--- a/sysdeps/powerpc/power7/fpu/s_logbf.c
+++ b/sysdeps/powerpc/fpu/s_logbf.c
@@ -1,4 +1,4 @@
-/* logbf(). PowerPC/POWER7 version.
+/* Get exponent of a floating-point value.  PowerPC version.
    Copyright (C) 2012-2019 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,40 +16,33 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <libm-alias-float.h>
-
+/* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make
+   generic implementation faster.  */
+#if defined(_ARCH_PWR8) || !defined(_ARCH_PWR7)
+# include <sysdeps/ieee754/flt-32/s_logbf.c>
+#else
+# include <math.h>
+# include <libm-alias-float.h>
 /* This implementation avoids FP to INT conversions by using VSX
    bitwise instructions over FP values.  */
-
-static const double two1div52 = 2.220446049250313e-16;	/* 1/2**52  */
-static const double two10m1   = -1023.0;		/* -2**10 + 1  */
-static const double two7m1    = -127.0;			/* -2**7 + 1  */
-
-/* FP mask to extract the exponent.  */
-static const union {
-  unsigned long long mask;
-  double d;
-} mask = { 0x7ff0000000000000ULL };
-
 float
 __logbf (float x)
 {
   /* VSX operation are all done internally as double.  */
   double ret;
 
-  if (__builtin_expect (x == 0.0, 0))
+  if (__glibc_unlikely (x == 0.0))
     /* Raise FE_DIVBYZERO and return -HUGE_VAL[LF].  */
-    return -1.0 / __builtin_fabsf (x);
+    return -1.0 / fabs (x);
 
-  /* ret = x & 0x7f800000;  */
-  asm (
-    "xxland %x0,%x1,%x2\n"
-    "fcfid  %0,%0"
-    : "=f"(ret)
-    : "f" (x), "f" (mask.d));
+  /* mask to extract the exponent.  */
+  asm ("xxland %x0,%x1,%x2\n"
+       "fcfid  %0,%0"
+       : "=d"(ret)
+       : "d" (x), "d" (0x7ff0000000000000ULL));
   /* ret = (ret >> 52) - 1023.0, since ret is double.  */
-  ret = (ret * two1div52) + two10m1;
-  if (__builtin_expect (ret > -two7m1, 0))
+  ret = (ret * 0x1p-52) - 1023.0;
+  if (ret > 127.0)
     /* Multiplication is used to set logb (+-INF) = INF.  */
     return (x * x);
   /* Since operations are done with double we don't need
@@ -57,4 +50,7 @@ __logbf (float x)
      The test is to avoid logb_downward (0.0) == -0.0.  */
   return ret == -0.0 ? 0.0 : ret;
 }
+# ifndef __logbf
 libm_alias_float (__logb, logb)
+# endif
+#endif
diff --git a/sysdeps/powerpc/power7/fpu/s_logbl.c b/sysdeps/powerpc/fpu/s_logbl.c
similarity index 72%
rename from sysdeps/powerpc/power7/fpu/s_logbl.c
rename to sysdeps/powerpc/fpu/s_logbl.c
index 76c29daeca..543cd4a188 100644
--- a/sysdeps/powerpc/power7/fpu/s_logbl.c
+++ b/sysdeps/powerpc/fpu/s_logbl.c
@@ -1,4 +1,4 @@
-/* logbl(). PowerPC/POWER7 version.
+/* Get exponent of a floating-point value.  PowerPC version.
    Copyright (C) 2012-2019 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,22 +16,17 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <math.h>
-#include <math_private.h>
-#include <math_ldbl_opt.h>
+/* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make
+   generic implementation faster.  */
+#if defined(_ARCH_PWR8) || !defined(_ARCH_PWR7)
+# include <./sysdeps/ieee754/ldbl-128ibm/s_logbl.c>
+#else
+# include <math.h>
+# include <math_private.h>
+# include <math_ldbl_opt.h>
 
 /* This implementation avoids FP to INT conversions by using VSX
    bitwise instructions over FP values.  */
-
-static const double two1div52 = 2.220446049250313e-16;	/* 1/2**52  */
-static const double two10m1   = -1023.0;		/* 2**10 -1  */
-
-/* FP mask to extract the exponent.  */
-static const union {
-  unsigned long long mask;
-  double d;
-} mask = { 0x7ff0000000000000ULL };
-
 long double
 __logbl (long double x)
 {
@@ -39,24 +34,23 @@ __logbl (long double x)
   double ret;
   int64_t hx;
 
-  if (__builtin_expect (x == 0.0L, 0))
+  if (__glibc_unlikely (x == 0.0))
     /* Raise FE_DIVBYZERO and return -HUGE_VAL[LF].  */
     return -1.0L / __builtin_fabsl (x);
 
   ldbl_unpack (x, &xh, &xl);
   EXTRACT_WORDS64 (hx, xh);
-  /* ret = x & 0x7ff0000000000000;  */
-  asm (
-    "xxland %x0,%x1,%x2\n"
-    "fcfid  %0,%0"
-    : "=f" (ret)
-    : "f" (xh), "f" (mask.d));
-  /* ret = (ret >> 52) - 1023.0;  */
-  ret = (ret * two1div52) + two10m1;
-  if (__builtin_expect (ret > -two10m1, 0))
+
+  /* Mask to extract the exponent.  */
+  asm ("xxland %x0,%x1,%x2\n"
+       "fcfid  %0,%0"
+       : "=d" (ret)
+       : "d" (xh), "d" (0x7ff0000000000000ULL));
+  ret = (ret * 0x1p-52) - 1023.0;
+  if (ret > 1023.0)
     /* Multiplication is used to set logb (+-INF) = INF.  */
     return (xh * xh);
-  else if (__builtin_expect (ret == two10m1, 0))
+  else if (ret == -1023.0)
     {
       /* POSIX specifies that denormal number is treated as
          though it were normalized.  */
@@ -78,6 +72,7 @@ __logbl (long double x)
   /* Test to avoid logb_downward (0.0) == -0.0.  */
   return ret == -0.0 ? 0.0 : ret;
 }
-#ifndef __logbl
+# ifndef __logbl
 long_double_symbol (libm, __logbl, logbl);
+# endif
 #endif
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logb-power7.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logb-power7.c
index 812771ac2e..c893ebcf29 100644
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logb-power7.c
+++ b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logb-power7.c
@@ -16,16 +16,5 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <math.h>
-#include <math_ldbl_opt.h>
-
-#undef weak_alias
-#define weak_alias(a, b)
-#undef strong_alias
-#define strong_alias(a, b)
-#undef compat_symbol
-#define compat_symbol(lib, name, alias, ver)
-
 #define __logb __logb_power7
-
-#include <sysdeps/powerpc/power7/fpu/s_logb.c>
+#include <sysdeps/powerpc/fpu/s_logb.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbf-power7.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbf-power7.c
index 62c2318421..059c53bce2 100644
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbf-power7.c
+++ b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbf-power7.c
@@ -16,11 +16,5 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <math.h>
-
-#undef weak_alias
-#define weak_alias(a, b)
-
 #define __logbf __logbf_power7
-
-#include <sysdeps/powerpc/power7/fpu/s_logbf.c>
+#include <sysdeps/powerpc/fpu/s_logbf.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbl-power7.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbl-power7.c
index c4fe590c6c..22a6ffb064 100644
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbl-power7.c
+++ b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbl-power7.c
@@ -17,5 +17,4 @@
    <http://www.gnu.org/licenses/>.  */
 
 #define __logbl __logbl_power7
-
-#include <sysdeps/powerpc/power7/fpu/s_logbl.c>
+#include <sysdeps/powerpc/fpu/s_logbl.c>
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
index 63de39bbf1..f4e2e88af0 100644
--- a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
@@ -32,6 +32,12 @@ libm-sysdep_routines += s_ceil-power5+ \
 			s_llround-power5+ \
 			s_llround-ppc64 \
 			s_llroundf-ppc64 \
+			s_logb-power7 \
+			s_logbf-power7 \
+			s_logbl-power7 \
+			s_logb-ppc64 \
+			s_logbf-ppc64 \
+			s_logbl-ppc64 \
 			$(sysdep_calls:s_%=m_%)
 
 CFLAGS-s_ceil-power5+.c = -mcpu=power5+
@@ -48,6 +54,10 @@ CFLAGS-s_llround-power5+.c += -mcpu=power5+
 
 CFLAGS-s_modf-power5+.c += -mcpu=power5+
 CFLAGS-s_modff-power5+.c += -mcpu=power5+
+CFLAGS-s_logbf-power7.c = -mcpu=power7
+CFLAGS-s_logbl-power7.c = -mcpu=power7
+CFLAGS-s_logb-power7.c = -mcpu=power7
+
 # These files quiet sNaNs in a way that is optimized away without
 # -fsignaling-nans.
 CFLAGS-s_modf-ppc64.c += -fsignaling-nans
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb-power7.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb-power7.c
similarity index 91%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb-power7.c
rename to sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb-power7.c
index 507862b2bf..807bf58eeb 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb-power7.c
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb-power7.c
@@ -16,4 +16,5 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logb-power7.c>
+#define __logb __logb_power7
+#include <sysdeps/powerpc/fpu/s_logb.c>
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb-ppc64.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb-ppc64.c
similarity index 100%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb-ppc64.c
rename to sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb-ppc64.c
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb.c
similarity index 100%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb.c
rename to sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb.c
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf-power7.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf-power7.c
similarity index 91%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf-power7.c
rename to sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf-power7.c
index 3535ea78cd..4fee11dd84 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf-power7.c
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf-power7.c
@@ -16,4 +16,5 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbf-power7.c>
+#define __logbf __logbf_power7
+#include <sysdeps/powerpc/fpu/s_logbf.c>
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf-ppc64.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf-ppc64.c
similarity index 100%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf-ppc64.c
rename to sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf-ppc64.c
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf.c
similarity index 100%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf.c
rename to sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf.c
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl-power7.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl-power7.c
similarity index 91%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl-power7.c
rename to sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl-power7.c
index 915636176d..c413d6e50d 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl-power7.c
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl-power7.c
@@ -16,4 +16,5 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbl-power7.c>
+#define __logbl __logbl_power7
+#include <sysdeps/powerpc/fpu/s_logbl.c>
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl-ppc64.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl-ppc64.c
similarity index 100%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl-ppc64.c
rename to sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl-ppc64.c
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl.c
similarity index 100%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl.c
rename to sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl.c
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
deleted file mode 100644
index d7ad1e2724..0000000000
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
+++ /dev/null
@@ -1,11 +0,0 @@
-ifeq ($(subdir),math)
-sysdep_routines += $(sysdep_calls)
-libm-sysdep_routines += s_logb-power7 s_logbf-power7 \
-			s_logbl-power7 s_logb-ppc64 s_logbf-ppc64 \
-			s_logbl-ppc64 \
-			$(sysdep_calls:s_%=m_%)
-
-CFLAGS-s_logbf-power7.c = -mcpu=power7
-CFLAGS-s_logbl-power7.c = -mcpu=power7
-CFLAGS-s_logb-power7.c = -mcpu=power7
-endif
diff --git a/sysdeps/powerpc/powerpc64/power7/fpu/s_logb.c b/sysdeps/powerpc/powerpc64/power7/fpu/s_logb.c
deleted file mode 100644
index 2599c771d9..0000000000
--- a/sysdeps/powerpc/powerpc64/power7/fpu/s_logb.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/powerpc/power7/fpu/s_logb.c>
diff --git a/sysdeps/powerpc/powerpc64/power7/fpu/s_logbf.c b/sysdeps/powerpc/powerpc64/power7/fpu/s_logbf.c
deleted file mode 100644
index 7a5a8032e0..0000000000
--- a/sysdeps/powerpc/powerpc64/power7/fpu/s_logbf.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/powerpc/power7/fpu/s_logbf.c>
diff --git a/sysdeps/powerpc/powerpc64/power7/fpu/s_logbl.c b/sysdeps/powerpc/powerpc64/power7/fpu/s_logbl.c
deleted file mode 100644
index 524ae2c78d..0000000000
--- a/sysdeps/powerpc/powerpc64/power7/fpu/s_logbl.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <sysdeps/powerpc/power7/fpu/s_logbl.c>
