mirror of
git://gcc.gnu.org/git/gcc.git
synced 2025-03-31 15:31:11 +08:00
re PR target/46779 ([avr] wrong code generation for values held in R28/R29)
PR target/46779 PR target/45291 PR target/41894 * gcc.target/avr/pr46779-1.c: New test case * gcc.target/avr/pr46779-2.c: New test case From-SVN: r172442
This commit is contained in:
parent
81c1113ac9
commit
54578a5777
@ -1,3 +1,11 @@
|
||||
2011-04-14 Georg-Johann Lay <avr@gjlay.de>
|
||||
|
||||
PR target/46779
|
||||
PR target/45291
|
||||
PR target/41894
|
||||
* gcc.target/avr/pr46779-1.c: New test case
|
||||
* gcc.target/avr/pr46779-2.c: New test case
|
||||
|
||||
2011-04-14 Jason Merrill <jason@redhat.com>
|
||||
|
||||
* g++.dg/cpp0x/sfinae15.C: New.
|
||||
|
51
gcc/testsuite/gcc.target/avr/pr46779-1.c
Normal file
51
gcc/testsuite/gcc.target/avr/pr46779-1.c
Normal file
@ -0,0 +1,51 @@
|
||||
/* { dg-do run } */
|
||||
/* { dg-options "-Os -fsplit-wide-types" } */
|
||||
|
||||
/* This testcase should uncover bugs like
|
||||
PR46779
|
||||
PR45291
|
||||
PR41894
|
||||
|
||||
The inline asm just serves to direct y into the Y register.
|
||||
Otherwise, it is hard to write a "stable" test case that
|
||||
also fails with slight variations in source code, middle- resp.
|
||||
backend.
|
||||
|
||||
The problem is that Y is also the frame-pointer, and
|
||||
avr.c:avr_hard_regno_mode_ok disallows QI to get in Y-reg.
|
||||
However, the y.a = 0 generates a
|
||||
(set (subreg:QI (reg:HI pseudo)) ...)
|
||||
where pseudo gets allocated to Y.
|
||||
|
||||
Reload fails to generate the right spill.
|
||||
*/
|
||||
|
||||
#include <stdlib.h>
|
||||
|
||||
struct S
|
||||
{
|
||||
unsigned char a, b;
|
||||
} ab = {12, 34};
|
||||
|
||||
void yoo (struct S y)
|
||||
{
|
||||
__asm volatile ("ldi %B0, 56" : "+y" (y));
|
||||
y.a = 0;
|
||||
__asm volatile ("; y = %0" : "+y" (y));
|
||||
ab = y;
|
||||
}
|
||||
|
||||
int main ()
|
||||
{
|
||||
yoo (ab);
|
||||
|
||||
if (ab.a != 0)
|
||||
abort();
|
||||
|
||||
if (ab.b != 56)
|
||||
abort();
|
||||
|
||||
exit (0);
|
||||
|
||||
return 0;
|
||||
}
|
51
gcc/testsuite/gcc.target/avr/pr46779-2.c
Normal file
51
gcc/testsuite/gcc.target/avr/pr46779-2.c
Normal file
@ -0,0 +1,51 @@
|
||||
/* { dg-do run } */
|
||||
/* { dg-options "-Os -fno-split-wide-types" } */
|
||||
|
||||
/* This testcase should uncover bugs like
|
||||
PR46779
|
||||
PR45291
|
||||
PR41894
|
||||
|
||||
The inline asm just serves to direct y into the Y register.
|
||||
Otherwise, it is hard to write a "stable" test case that
|
||||
also fails with slight variations in source code, middle- resp.
|
||||
backend.
|
||||
|
||||
The problem is that Y is also the frame-pointer, and
|
||||
avr.c:avr_hard_regno_mode_ok disallows QI to get in Y-reg.
|
||||
However, the y.a = 0 generates a
|
||||
(set (subreg:QI (reg:HI pseudo)) ...)
|
||||
where pseudo gets allocated to Y.
|
||||
|
||||
Reload fails to generate the right spill.
|
||||
*/
|
||||
|
||||
#include <stdlib.h>
|
||||
|
||||
struct S
|
||||
{
|
||||
unsigned char a, b;
|
||||
} ab = {12, 34};
|
||||
|
||||
void yoo (struct S y)
|
||||
{
|
||||
__asm volatile ("ldi %B0, 56" : "+y" (y));
|
||||
y.a = 0;
|
||||
__asm volatile ("; y = %0" : "+y" (y));
|
||||
ab = y;
|
||||
}
|
||||
|
||||
int main ()
|
||||
{
|
||||
yoo (ab);
|
||||
|
||||
if (ab.a != 0)
|
||||
abort();
|
||||
|
||||
if (ab.b != 56)
|
||||
abort();
|
||||
|
||||
exit (0);
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
x
Reference in New Issue
Block a user