[Bug libfortran/48602] Invalid F conversion of G descriptor for values close to powers of 10

[Jerry DeLisle]

On 04/17/2011 06:25 AM, thenlich at users dot sourceforge.net wrote:
--- snip ---

>
> I agree.
>
> Let's open a new bug for this. This bug is about the correct choice of format,
> not about rounding (this is somewhere else in the code).
>

Yes, new PR.  We are using builtin snprintf for DTOA.

#define DTOA \
snprintf (buffer, size, "%+-#" STR(MIN_FIELD_WIDTH) ".*" \
	  "e", ndigits - 1, tmp);

By examining the buffer returned, we are getting an exact value back before we 
even begin processing the string for our libgfortran needs. The buffer for this 
case contains:

buffer=990e-02

The first digit is an artifact of shifting the buffer for decimal point 
placement and is ignored. I still need to check the code between the call to 
snprintf and where I have placed a printf to view it.

snprintf may be rounding the value up. Testing continues.