i386: Use generic exp10f

The generic implementation is twice as fast.  Using the exp10f
benchmark:

 * master:
  "exp10f": {
   "workload-spec2017.wrf (adapted)": {
    "duration": 1.02967e+09,
    "iterations": 4.768e+07,
    "reciprocal-throughput": 18.3579,
    "latency": 24.8331,
    "max-throughput": 5.44725e+07,
    "min-throughput": 4.02688e+07
   }
  }

 * patched:
  "exp10f": {
   "workload-spec2017.wrf (adapted)": {
    "duration": 1.01821e+09,
    "iterations": 6.1984e+07,
    "reciprocal-throughput": 13.1975,
    "latency": 19.6563,
    "max-throughput": 7.57719e+07,
    "min-throughput": 5.08743e+07
   }
  }

Checked on i686-linux-gnu.

diff --git a/sysdeps/i386/fpu/e_exp10f.S b/sysdeps/i386/fpu/e_exp10f.S
deleted file mode 100644 (file)
index 196ce87..0000000
--- a/sysdeps/i386/fpu/e_exp10f.S
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * Written by Ulrich Drepper.
- */
-
-#include <machine/asm.h>
-#include <i386-math-asm.h>
-#include <libm-alias-finite.h>
-
-DEFINE_FLT_MIN
-
-#ifdef PIC
-# define MO(op) op##@GOTOFF(%ecx)
-#else
-# define MO(op) op
-#endif
-
-       .text
-/* 10^x = 2^(x * log2(10)) */
-ENTRY(__ieee754_exp10f)
-#ifdef  PIC
-       LOAD_PIC_REG (cx)
-#endif
-       flds    4(%esp)
-/* I added the following ugly construct because exp(+-Inf) resulted
-   in NaN.  The ugliness results from the bright minds at Intel.
-   For the i686 the code can be written better.
-   -- drepper@cygnus.com.  */
-       fxam                            /* Is NaN or +-Inf?  */
-       fstsw   %ax
-       movb    $0x45, %dh
-       andb    %ah, %dh
-       cmpb    $0x05, %dh
-       je      1f                      /* Is +-Inf, jump.  */
-       fldl2t
-       fmulp                           /* x * log2(10) */
-       fld     %st
-       frndint                         /* int(x * log2(10)) */
-       fsubr   %st,%st(1)              /* fract(x * log2(10)) */
-       fxch
-       f2xm1                           /* 2^(fract(x * log2(10))) - 1 */
-       fld1
-       faddp                           /* 2^(fract(x * log2(10))) */
-       fscale                          /* e^x */
-       fstp    %st(1)
-       FLT_NARROW_EVAL_UFLOW_NONNEG_NAN
-       ret
-
-1:     testl   $0x200, %eax            /* Test sign.  */
-       jz      2f                      /* If positive, jump.  */
-       fstp    %st
-       fldz                            /* Set result to 0.  */
-2:     ret
-END (__ieee754_exp10f)
-libm_alias_finite (__ieee754_exp10f, __exp10f)