[Bug other/25028] New: TImode-to-floating conversions broken

["jsm28 at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

int printf(const char *, ...);
typedef int TItype __attribute__((mode(TI)));
TItype x = -1;
int main(void) { printf("%f %f\n", (float)x, (double)x); return 0; }

displays
0.000000 0.000000
on x86_64-unknown-linux-gnu.  The conversion functions in libgcc2.c work for
converting DImode values on the presumption that SImode values can be converted
exactly to DFmode and wider.  They don't work for converting TImode values to
types which can't exactly represent all DImode values.

(I'd say these functions should have #if conditionals embodying their
prerequisites about type precisions, to make build fail for unsupported
combinations, but existing targets need fixing first.)


-- 
           Summary: TImode-to-floating conversions broken
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jsm28 at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25028