[Qemu-devel] [PATCH 100/111] m68k: use log10l() to compute log10_FP0()

[Bryce Lanham <blanham@gmail.com>]

From: Laurent Vivier <laurent@vivier.eu>

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 target-m68k/helper.c |   22 +++++++---------------
 1 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/target-m68k/helper.c b/target-m68k/helper.c
index f67a2d8..0c60093 100644
--- a/target-m68k/helper.c
+++ b/target-m68k/helper.c
@@ -1368,23 +1368,15 @@ void HELPER(ln_FP0)(CPUState *env)
 
 void HELPER(log10_FP0)(CPUState *env)
 {
-    float64 f, log2, log210;
-    floatx80 res;
-
-    /* log10(x) = log2(x) / log2(10) */
-
-    DBG_FPUH("log10_FP0 %Lg", floatx80_to_ldouble(FP0_to_floatx80(env)));
-    f = floatx80_to_float64(FP0_to_floatx80(env), &env->fp_status);
+    floatx80 val;
+    long double res;
 
-    log2 = float64_log2(f, &env->fp_status);
-    log210 = float64_log2(floatx80_to_float64(floatx80_10, &env->fp_status),
-                          &env->fp_status);
-    res = floatx80_div(float64_to_floatx80(log2, &env->fp_status),
-                       float64_to_floatx80(log210, &env->fp_status),
-                       &env->fp_status);
-    DBG_FPU(" = %Lg\n", floatx80_to_ldouble(res));
+    val = FP0_to_floatx80(env);
+    DBG_FPUH("log10_FP0 %Lg", floatx80_to_ldouble(val));
+    res = log10l(floatx80_to_ldouble(val));
+    DBG_FPU(" = %Lg\n", res);
 
-    floatx80_to_FP0(env, res);
+    floatx80_to_FP0(env, ldouble_to_floatx80(res));
 }
 
 void HELPER(atan_FP0)(CPUState *env)
-- 
1.7.2.3