Make drem an alias of remainder (bug 16171).

The libm drem functions just call the corresponding __remainder
functions.  This patch removes the unnecessary wrappers by making them
into weak aliases at the ELF level.

Tested for x86_64, x86, mips64 and powerpc.

	[BZ #16171]
	* math/w_remainder.c (drem): Define as weak alias of __remainder.
	[NO_LONG_DOUBLE] (dreml): Define as weak alias of __remainder.
	* math/w_remainderf.c (dremf): Define as weak alias of
	__remainderf.
	* math/w_remainderl.c (dreml): Define as weak alias of
	__remainderl.
	* sysdeps/ia64/fpu/e_remainder.S (drem): Define as weak alias of
	__remainder.
	* sysdeps/ia64/fpu/e_remainderf.S (dremf): Define as weak alias of
	__remainderf.
	* sysdeps/ia64/fpu/e_remainderl.S (dreml): Define as weak alias of
	__remainderl.
	* sysdeps/ieee754/ldbl-opt/nldbl-remainder.c (dreml): Define as
	weak alias of remainderl.
	* sysdeps/ieee754/ldbl-opt/w_remainder.c
	[LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)] (__drem): Define as strong
	alias of __remainder.
	[LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)] (dreml): Use compat_symbol.
	* sysdeps/ieee754/ldbl-opt/w_remainderl.c (__dreml): Define as
	strong alias of __remainderl.
	(dreml): Use long_double_symbol.
	* math/Makefile (libm-calls): Remove w_drem.
	* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Remove drem.
	(CFLAGS-nldbl-drem.c): Remove variable.
	(CFLAGS-nldbl-remainder.c): Add -fno-builtin-dreml.
	* math/w_drem.c: Remove file.
	* math/w_dremf.c: Likewise.
	* math/w_dreml.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/nldbl-drem.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/w_drem.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/w_dreml.c: Likewise.

7 files changed, 8 insertions, 21 deletions

diff --git a/sysdeps/ieee754/ldbl-opt/Makefile b/sysdeps/ieee754/ldbl-opt/Makefile
index 222122de0b..53091e410c 100644
--- a/sysdeps/ieee754/ldbl-opt/Makefile
+++ b/sysdeps/ieee754/ldbl-opt/Makefile
@@ -31,7 +31,7 @@ libnldbl-calls = asprintf dprintf fprintf fscanf fwprintf fwscanf iovfscanf \
 		 tanh acosh asinh atanh exp log log10 exp10 pow10 expm1 \
 		 log1p logb exp2 sqrt cbrt fabs floor j0 j1 y0 y1 erf erfc \
 		 lgamma tgamma gamma rint nearbyint round trunc \
-		 copysign fdim fmax fmin nextafter pow hypot fmod drem \
+		 copysign fdim fmax fmin nextafter pow hypot fmod \
 		 remainder ldexp scalbn frexp modf scalbln fma nan sincos \
 		 jn yn ilogb remquo lrint lround llrint llround nexttowardf \
 		 nexttoward conj cacos cacosh casin catan catanh ccos ccosh \
@@ -81,7 +81,6 @@ CFLAGS-nldbl-csinh.c = -fno-builtin-csinhl
 CFLAGS-nldbl-csqrt.c = -fno-builtin-csqrtl
 CFLAGS-nldbl-ctan.c = -fno-builtin-ctanl
 CFLAGS-nldbl-ctanh.c = -fno-builtin-ctanhl
-CFLAGS-nldbl-drem.c = -fno-builtin-dreml
 CFLAGS-nldbl-erf.c = -fno-builtin-erfl
 CFLAGS-nldbl-erfc.c = -fno-builtin-erfcl
 CFLAGS-nldbl-exp.c = -fno-builtin-expl
@@ -125,7 +124,7 @@ CFLAGS-nldbl-nexttoward.c = -fno-builtin-nexttoward -fno-builtin-nexttowardl
 CFLAGS-nldbl-nexttowardf.c = -fno-builtin-nexttowardf
 CFLAGS-nldbl-pow.c = -fno-builtin-powl
 CFLAGS-nldbl-pow10.c = -fno-builtin-pow10l
-CFLAGS-nldbl-remainder.c = -fno-builtin-remainderl
+CFLAGS-nldbl-remainder.c = -fno-builtin-remainderl -fno-builtin-dreml
 CFLAGS-nldbl-remquo.c = -fno-builtin-remquol
 CFLAGS-nldbl-rint.c = -fno-builtin-rintl
 CFLAGS-nldbl-round.c = -fno-builtin-roundl
diff --git a/sysdeps/ieee754/ldbl-opt/nldbl-drem.c b/sysdeps/ieee754/ldbl-opt/nldbl-drem.c
deleted file mode 100644
index 1e08ce1d28..0000000000
--- a/sysdeps/ieee754/ldbl-opt/nldbl-drem.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include "nldbl-compat.h"
-
-double
-attribute_hidden
-dreml (double x, double y)
-{
-  return drem (x, y);
-}
diff --git a/sysdeps/ieee754/ldbl-opt/nldbl-remainder.c b/sysdeps/ieee754/ldbl-opt/nldbl-remainder.c
index a8d5bafb5f..581dc78a4d 100644
--- a/sysdeps/ieee754/ldbl-opt/nldbl-remainder.c
+++ b/sysdeps/ieee754/ldbl-opt/nldbl-remainder.c
@@ -6,3 +6,5 @@ remainderl (double x, double y)
 {
   return remainder (x, y);
 }
+extern __typeof (remainderl) dreml attribute_hidden;
+weak_alias (remainderl, dreml)
diff --git a/sysdeps/ieee754/ldbl-opt/w_drem.c b/sysdeps/ieee754/ldbl-opt/w_drem.c
deleted file mode 100644
index 788a5d29d6..0000000000
--- a/sysdeps/ieee754/ldbl-opt/w_drem.c
+++ /dev/null
@@ -1,5 +0,0 @@
-#include <math_ldbl_opt.h>
-#include <math/w_drem.c>
-#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
-compat_symbol (libm, __drem, dreml, GLIBC_2_0);
-#endif
diff --git a/sysdeps/ieee754/ldbl-opt/w_dreml.c b/sysdeps/ieee754/ldbl-opt/w_dreml.c
deleted file mode 100644
index d14d7e202c..0000000000
--- a/sysdeps/ieee754/ldbl-opt/w_dreml.c
+++ /dev/null
@@ -1,5 +0,0 @@
-#include <math_ldbl_opt.h>
-#undef weak_alias
-#define weak_alias(n,a)
-#include <math/w_dreml.c>
-long_double_symbol (libm, __dreml, dreml);
diff --git a/sysdeps/ieee754/ldbl-opt/w_remainder.c b/sysdeps/ieee754/ldbl-opt/w_remainder.c
index 94d98930f4..dfa7b7f569 100644
--- a/sysdeps/ieee754/ldbl-opt/w_remainder.c
+++ b/sysdeps/ieee754/ldbl-opt/w_remainder.c
@@ -2,4 +2,6 @@
 #include <math/w_remainder.c>
 #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
 compat_symbol (libm, __remainder, remainderl, GLIBC_2_0);
+strong_alias (__remainder, __drem)
+compat_symbol (libm, __drem, dreml, GLIBC_2_0);
 #endif
diff --git a/sysdeps/ieee754/ldbl-opt/w_remainderl.c b/sysdeps/ieee754/ldbl-opt/w_remainderl.c
index e450a25bbc..7a344b7709 100644
--- a/sysdeps/ieee754/ldbl-opt/w_remainderl.c
+++ b/sysdeps/ieee754/ldbl-opt/w_remainderl.c
@@ -3,3 +3,5 @@
 #define weak_alias(n,a)
 #include <math/w_remainderl.c>
 long_double_symbol (libm, __remainderl, remainderl);
+strong_alias (__remainderl, __dreml)
+long_double_symbol (libm, __dreml, dreml);