* config/fp-bit.h (LSHIFT): Take shift count parameter.

	* config/fp-bit.c (_fpadd_parts): Shift in one go instead of one
	bit at a time.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@107602 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index aaed30c..2320e10 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2005-11-28  Joseph S. Myers  <joseph@codesourcery.com>
+
+       * config/fp-bit.h (LSHIFT): Take shift count parameter.
+       * config/fp-bit.c (_fpadd_parts): Shift in one go instead of one
+       bit at a time.
+
 2005-11-28  Bernd Schmidt  <bernd.schmidt@analog.com>
 
        * config/bfin/bfin.c (bfin_secondary_reload): Renamed from

diff --git a/gcc/config/fp-bit.c b/gcc/config/fp-bit.c
index ccf927e..cf943da 100644 (file)
--- a/gcc/config/fp-bit.c
+++ b/gcc/config/fp-bit.c
@@ -649,6 +649,7 @@ _fpadd_parts (fp_number_type * a,
      they're the same */
   {
     int diff;
+    int sdiff;
 
     a_normal_exp = a->normal_exp;
     b_normal_exp = b->normal_exp;
@@ -656,21 +657,21 @@ _fpadd_parts (fp_number_type * a,
     b_fraction = b->fraction.ll;
 
     diff = a_normal_exp - b_normal_exp;
+    sdiff = diff;
 
     if (diff < 0)
       diff = -diff;
     if (diff < FRAC_NBITS)
       {
-       /* ??? This does shifts one bit at a time.  Optimize.  */
-       while (a_normal_exp > b_normal_exp)
+       if (sdiff > 0)
          {
-           b_normal_exp++;
-           LSHIFT (b_fraction);
+           b_normal_exp += diff;
+           LSHIFT (b_fraction, diff);
          }
-       while (b_normal_exp > a_normal_exp)
+       else if (sdiff < 0)
          {
-           a_normal_exp++;
-           LSHIFT (a_fraction);
+           a_normal_exp += diff;
+           LSHIFT (a_fraction, diff);
          }
       }
     else
@@ -731,7 +732,7 @@ _fpadd_parts (fp_number_type * a,
 
   if (tmp->fraction.ll >= IMPLICIT_2)
     {
-      LSHIFT (tmp->fraction.ll);
+      LSHIFT (tmp->fraction.ll, 1);
       tmp->normal_exp++;
     }
   return tmp;

diff --git a/gcc/config/fp-bit.h b/gcc/config/fp-bit.h
index 3f7a0df..78d850b 100644 (file)
--- a/gcc/config/fp-bit.h
+++ b/gcc/config/fp-bit.h
@@ -318,7 +318,7 @@ typedef unsigned int UTItype __attribute__ ((mode (TI)));
 #endif
 
 /* Preserve the sticky-bit when shifting fractions to the right.  */
-#define LSHIFT(a) { a = (a & 1) | (a >> 1); }
+#define LSHIFT(a, s) { a = (a >> s) | !!(a & (((fractype) 1 << s) - 1)); }
 
 /* numeric parameters */
 /* F_D_BITOFF is the number of bits offset between the MSB of the mantissa