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re-introduce __builtin_add_overflow

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r57789 (74cdd89) was gradually "improve"d by naruse through r57793 to
r57806, resulted in reverting the efect of r57789 while retaining its
complexity.  I think the current situation is slightly worse than
before (same output complicated source code).

Here I introduce __builtin_add_overflow again, which (I think) is what
naruse wanted to do in r57793.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57807 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
shyouhei 2017-03-08 04:50:22 +00:00
parent 63c7ccc64b
commit b515528271
3 changed files with 20 additions and 25 deletions
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29
include/ruby/ruby.h
View file

@ -1505,15 +1505,14 @@ rb_integer_type_p(VALUE obj)
#endif
static inline int
rb_long2fix_overflow(long l, VALUE *ptr)
rb_long_is_fixable_p(long v)
{
if (RB_FIXABLE(l)) {
*ptr = RB_LONG2FIX(l);
return 0;
}
else {
return 1;
}
#ifdef HAVE_BUILTIN___BUILTIN_ADD_OVERFLOW
SIGNED_VALUE w;
return! __builtin_add_overflow(v, v, &w);
#else
return RB_FIXABLE(v);
#endif
}
#if SIZEOF_INT < SIZEOF_LONG
@ -1523,11 +1522,10 @@ rb_long2fix_overflow(long l, VALUE *ptr)
static inline VALUE
rb_int2num_inline(int v)
{
VALUE ret;
if (rb_long2fix_overflow(v, &ret))
return rb_int2big(v);
if (rb_long_is_fixable_p(v))
return RB_INT2FIX(v);
else
return ret;
return rb_int2big(v);
}
#define RB_INT2NUM(x) rb_int2num_inline(x)
@ -1547,11 +1545,10 @@ rb_uint2num_inline(unsigned int v)
static inline VALUE
rb_long2num_inline(long v)
{
VALUE ret;
if (rb_long2fix_overflow(v, &ret))
return rb_int2big(v);
if (rb_long_is_fixable_p(v))
return RB_LONG2FIX(v);
else
return ret;
return rb_int2big(v);
}
#define RB_LONG2NUM(x) rb_long2num_inline(x)

9
internal.h
View file

@ -368,7 +368,7 @@ ntz_intptr(uintptr_t x)
# define DL2NUM(x) LL2NUM(x)
#elif defined(HAVE_INT128_T)
# define DLONG int128_t
# define DL2NUM(x) ((RB_POSFIXABLE(x) && RB_NEGFIXABLE(x)) ? LONG2FIX(x) : rb_int128t2big(x))
# define DL2NUM(x) (RB_FIXABLE(x) ? LONG2FIX(x) : rb_int128t2big(x))
VALUE rb_int128t2big(int128_t n);
#endif
@ -1386,12 +1386,11 @@ rb_float_new_inline(double d)
static inline VALUE
rb_dbl2ival(double d)
{
VALUE val;
if (rb_long2fix_overflow(d, &val)) {
return rb_dbl2big(d);
if (RB_FIXABLE(d)) {
return LONG2FIX((long)d);
}
else {
return val;
return rb_dbl2big(d);
}
}

7
numeric.c
View file

@ -3007,16 +3007,15 @@ VALUE
rb_num2fix(VALUE val)
{
long v;
VALUE w;
if (FIXNUM_P(val)) {
return val;
}
else if (rb_long2fix_overflow((v = rb_num2long(val)), &w)) {
rb_raise(rb_eRangeError, "integer %ld out of range of fixnum", v);
else if (rb_long_is_fixable_p(v = rb_num2long(val))) {
return LONG2FIX(v);
}
else {
return w;
rb_raise(rb_eRangeError, "integer %ld out of range of fixnum", v);
}
}