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sparc: Preserve ORIGINAL_REGNO in epilogue_renumber [PR105257] 

The following testcase ICEs, because the pic register is
(reg:DI 24 %i0 [109]) and is used in the delay slot of a return.
We invoke epilogue_renumber and that changes it to
(reg:DI 8 %o0) which no longer satisfies sparc_pic_register_p
predicate, so we don't recognize the insn anymore.

The following patch fixes that by preserving ORIGINAL_REGNO if
specified, so we get (reg:DI 8 %o0 [109]) instead.

2022-04-19  Jakub Jelinek  <jakub@redhat.com>

	PR target/105257
	* config/sparc/sparc.cc (epilogue_renumber): If ORIGINAL_REGNO,
	use gen_raw_REG instead of gen_rtx_REG and copy over also
	ORIGINAL_REGNO.  Use return 0; instead of /* fallthrough */.

	* gcc.dg/pr105257.c: New test.
This commit is contained in:
Jakub Jelinek 2022-04-19 18:58:59 +02:00
parent eb03e42459
commit eeca2b8bd0
2 changed files with 30 additions and 2 deletions
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16
gcc/config/sparc/sparc.cc
View File

@ -8884,8 +8884,20 @@ epilogue_renumber (rtx *where, int test)
if (REGNO (*where) >= 8 && REGNO (*where) < 24) /* oX or lX */
return 1;
if (! test && REGNO (*where) >= 24 && REGNO (*where) < 32)
*where = gen_rtx_REG (GET_MODE (*where), OUTGOING_REGNO (REGNO(*where)));
/* fallthrough */
{
if (ORIGINAL_REGNO (*where))
{
rtx n = gen_raw_REG (GET_MODE (*where),
OUTGOING_REGNO (REGNO (*where)));
ORIGINAL_REGNO (n) = ORIGINAL_REGNO (*where);
*where = n;
}
else
*where = gen_rtx_REG (GET_MODE (*where),
OUTGOING_REGNO (REGNO (*where)));
}
return 0;
case SCRATCH:
case PC:
case CONST_INT:

16
gcc/testsuite/gcc.dg/pr105257.c Normal file
View File

@ -0,0 +1,16 @@
/* PR target/105257 */
/* { dg-do compile } */
/* { dg-options "-O2" } */
/* { dg-additional-options "-fpic" { target fpic } } */
extern int sigsetjmp (void **, int);
void *buf[32];
void (*fn) (void);
const char *
bar (void)
{
sigsetjmp (buf, 0);
fn ();
return "";
}