------- Comment #11 from pinskia at gcc dot gnu dot org 2005-11-02 15:53
-------
The following fails with -O1 -fno-tree-sra.
typedef struct {
struct {unsigned Xl_ui;} Ul_i;
struct {unsigned Xl_uf;} Ul_f;
} l_fp;
void dolfptoa(short ndec)
{
l_fp work;
work.Ul_f.Xl_uf = 0x535f3d8;
while (ndec > 0) {
ndec--;
work.Ul_i.Xl_ui = 0;
work.Ul_i.Xl_ui = 0;
if ((work.Ul_f.Xl_uf) & 0x80000000)
(work.Ul_i.Xl_ui) |= 0x1;
(work.Ul_f.Xl_uf) <<= 1;
(work.Ul_i.Xl_ui) <<= 1;
if ((work.Ul_f.Xl_uf) & 0x80000000)
(work.Ul_i.Xl_ui) |= 0x1;
(work.Ul_f.Xl_uf) <<= 1;
(work.Ul_i.Xl_ui) <<= 1;
if (!(work.Ul_i.Xl_ui < 10))
abort ();
}
}
int main()
{
dolfptoa(6);
return 0;
}
----
The -fno-tree-sra is need as otherwise SRA actually does it work and renames
the PHIs correctly.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24627
