https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78041
Bug ID: 78041
Summary: Wrong code on ARMv7 with -mthumb -mfpu=neon-fp16 -O0
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: bernd.edlinger at hotmail dot de
Target Milestone: ---
This is a slightly modified test case:
gcc.c-torture/execute/pr34971.c
struct foo
{
unsigned long long b:40;
} x;
extern void abort (void);
void test1(unsigned long long res)
{
/* Build a rotate expression on a 40 bit argument. */
if ((x.b<<9) + (x.b>>31) != res)
abort ();
}
int main()
{
x.b = 0x0100000001;
test1(0x0000000202);
x.b = 0x0100000000;
test1(0x0000000002);
return 0;
}
when compiled with these options it fails:
gcc -mcpu=cortex-a9 -mthumb -mfpu=neon-fp16 -O0
