This test case fails with latest gcc 4.3.0. The test assumes 32 bit integers,
but even after changing the constants to long, it produces incorrect results.
With -O2 we get this:
int f(unsigned number_of_digits_to_use)
{
if (number_of_digits_to_use > 1294)
206: 65 e0 ldi r22, 0x05 ; 5
208: 8f 30 cpi r24, 0x0F ; 15
20a: 96 07 cpc r25, r22
20c: c0 f4 brcc .+48 ; 0x23e <f+0x38>
return 0;
return ((number_of_digits_to_use * 3321928L) / 1000000L + 1) /16;
20e: bc 01 movw r22, r24
210: 80 e0 ldi r24, 0x00 ; 0
212: 90 e0 ldi r25, 0x00 ; 0
214: 0e 94 6c 06 call 0xcd8 ; 0xcd8 <__mulsi3>
[...]
It "forgets" to load r18:r19:r20:r21 with 3321928 before calling __mulsi3.
--
Summary: gcc.c-torture/execute/pr27364.c fails with -O1, -O2 and
-Os
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pmarques at grupopie dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: avr-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34916
