Remove the error handling wrapper from pow

Introduce new pow symbol version that doesn't do SVID compatible error
handling.  The standard errno and fp exception based error handling is
inline in the new code and does not have significant overhead.

The wrapper is disabled for sysdeps/ieee754/dbl-64 by using empty
w_pow.c and enabled for targets with their own pow implementation or
ifunc dispatch on __ieee754_pow by including math/w_pow.c.

The compatibility symbol version still uses the wrapper with SVID error
handling around the new code.  There is no new symbol version nor
compatibility code on !LIBM_SVID_COMPAT targets (e.g. riscv).

On targets where previously powl was an alias of pow, now it points to
the compatibility symbol with the wrapper, because it still need the
SVID compatible error handling.  This affects NO_LONG_DOUBLE (e.g. arm)
and LONG_DOUBLE_COMPAT (e.g. alpha) targets as well.

The __pow_finite symbol is now an alias of pow.  Both __pow_finite and
pow set errno and thus not const functions.

The ia64 asm is changed so the compat and new symbol versions map to the
same address.

On x86_64 #include <math.h> was added before macro definitions that
may affect that header.

Tested with build-many-glibcs.py.

	* math/Versions (GLIBC_2.29): Add pow.
	* math/w_pow_compat.c (__pow_compat): Change to versioned compat
	symbol.
	* math/w_pow.c: New file.
	* sysdeps/i386/fpu/w_pow.c: New file.
	* sysdeps/ia64/fpu/e_pow.S: Add versioned symbols.
	* sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Rename to __pow
	and add necessary aliases.
	* sysdeps/ieee754/dbl-64/w_pow.c: New file.
	* sysdeps/m68k/m680x0/fpu/w_pow.c: New file.
	* sysdeps/mach/hurd/i386/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/alpha/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/arm/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/hppa/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/i386/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/ia64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/nios2/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist: Update.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/sh/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Update.
	* sysdeps/x86_64/fpu/multiarch/e_pow-fma.c (__ieee754_pow): Rename to
	__pow.
	* sysdeps/x86_64/fpu/multiarch/e_pow-fma4.c (__ieee754_pow): Likewise.
	* sysdeps/x86_64/fpu/multiarch/e_pow.c (__ieee754_pow): Likewise.
	* sysdeps/x86_64/fpu/multiarch/w_pow.c: New file.

4 files changed, 8 insertions, 5 deletions

diff --git a/sysdeps/x86_64/fpu/multiarch/e_pow-fma.c b/sysdeps/x86_64/fpu/multiarch/e_pow-fma.c
index 73c1e7fb89..2c5bfaeed7 100644
--- a/sysdeps/x86_64/fpu/multiarch/e_pow-fma.c
+++ b/sysdeps/x86_64/fpu/multiarch/e_pow-fma.c
@@ -1,5 +1,5 @@
-#define __ieee754_pow __ieee754_pow_fma
-#define __exp1 __exp1_fma
+#include <math.h>
+#define __pow __ieee754_pow_fma
 #define SECTION __attribute__ ((section (".text.fma")))
 
 #include <sysdeps/ieee754/dbl-64/e_pow.c>
diff --git a/sysdeps/x86_64/fpu/multiarch/e_pow-fma4.c b/sysdeps/x86_64/fpu/multiarch/e_pow-fma4.c
index 8971b655ca..7ec1a0ac84 100644
--- a/sysdeps/x86_64/fpu/multiarch/e_pow-fma4.c
+++ b/sysdeps/x86_64/fpu/multiarch/e_pow-fma4.c
@@ -1,5 +1,5 @@
-#define __ieee754_pow __ieee754_pow_fma4
-#define __exp1 __exp1_fma4
+#include <math.h>
+#define __pow __ieee754_pow_fma4
 #define SECTION __attribute__ ((section (".text.fma4")))
 
 #include <sysdeps/ieee754/dbl-64/e_pow.c>
diff --git a/sysdeps/x86_64/fpu/multiarch/e_pow.c b/sysdeps/x86_64/fpu/multiarch/e_pow.c
index 084073c936..207ffcd2f1 100644
--- a/sysdeps/x86_64/fpu/multiarch/e_pow.c
+++ b/sysdeps/x86_64/fpu/multiarch/e_pow.c
@@ -16,6 +16,8 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include <math.h>
+
 extern double __redirect_ieee754_pow (double, double);
 
 #define SYMBOL_NAME ieee754_pow
@@ -25,5 +27,5 @@ libc_ifunc_redirected (__redirect_ieee754_pow,
 		       __ieee754_pow, IFUNC_SELECTOR ());
 strong_alias (__ieee754_pow, __pow_finite)
 
-#define __ieee754_pow __ieee754_pow_sse2
+#define __pow __ieee754_pow_sse2
 #include <sysdeps/ieee754/dbl-64/e_pow.c>
diff --git a/sysdeps/x86_64/fpu/multiarch/w_pow.c b/sysdeps/x86_64/fpu/multiarch/w_pow.c
new file mode 100644
index 0000000000..b50c1988de
--- /dev/null
+++ b/sysdeps/x86_64/fpu/multiarch/w_pow.c
@@ -0,0 +1 @@
+#include <sysdeps/../math/w_pow.c>