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Don't let DEBUG_INSNSs change register renaming decisions

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PR debug/94439
	* regrename.c (check_new_reg_p): Ignore DEBUG_INSNs when walking
	the chain.

	PR debug/94439
	* gcc.dg/torture/pr94439.c: New test.
This commit is contained in:
Jeff Law 2020-04-18 09:39:18 -06:00
parent b57e1621eb
commit baf3b9b2e5
4 changed files with 77 additions and 5 deletions
gcc
ChangeLogregrename.c
testsuite
ChangeLog
gcc.dg/torture
pr94439.c

6
gcc/ChangeLog

@ -1,3 +1,9 @@
2020-04-18 Jeff Law <law@redhat.com>
PR debug/94439
* regrename.c (check_new_reg_p): Ignore DEBUG_INSNs when walking
the chain.
2020-04-18 Iain Buclaw <ibuclaw@gdcproject.org>
* doc/sourcebuild.texi (Effective-Target Keywords, Environment

16
gcc/regrename.c

@ -348,11 +348,17 @@ check_new_reg_p (int reg ATTRIBUTE_UNUSED, int new_reg,
/* See whether it accepts all modes that occur in
definition and uses. */
for (tmp = this_head->first; tmp; tmp = tmp->next_use)
if ((!targetm.hard_regno_mode_ok (new_reg, GET_MODE (*tmp->loc))
&& ! DEBUG_INSN_P (tmp->insn))
|| call_clobbered_in_chain_p (this_head, GET_MODE (*tmp->loc),
new_reg))
return false;
{
/* Completely ignore DEBUG_INSNs, otherwise we can get
-fcompare-debug failures. */
if (DEBUG_INSN_P (tmp->insn))
continue;
if (!targetm.hard_regno_mode_ok (new_reg, GET_MODE (*tmp->loc))
|| call_clobbered_in_chain_p (this_head, GET_MODE (*tmp->loc),
new_reg))
return false;
}
return true;
}

5
gcc/testsuite/ChangeLog

@ -1,3 +1,8 @@
2020-04-18 Jeff Law <law@redhat.com>
PR debug/94439
* gcc.dg/torture/pr94439.c: New test.
2020-04-18 Iain Buclaw <ibuclaw@gdcproject.org>
* gdc.dg/link.d: Use d_runtime_has_std_library effective target.

55
gcc/testsuite/gcc.dg/torture/pr94439.c Normal file

@ -0,0 +1,55 @@
/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
/* { dg-additional-options "-flive-patching=inline-clone -funroll-loops -fno-tree-forwprop -fno-expensive-optimizations -mstack-arg-probe -fcompare-debug" } */
/* { dg-skip-if "" { *-*-* } { "-flto" } { "" } } */
extern void exit (int);
extern void abort (void);
#define COMPARE_BODY(A, B, TYPE, COPYSIGN) \
do { \
TYPE s1 = COPYSIGN ((TYPE) 1.0, A); \
TYPE s2 = COPYSIGN ((TYPE) 1.0, B); \
if (s1 != s2) \
abort (); \
if ((__builtin_isnan (A) != 0) != (__builtin_isnan (B) != 0)) \
abort (); \
if ((A != B) != (__builtin_isnan (A) != 0)) \
abort (); \
} while (0)
void
comparel (long double a, long double b)
{
COMPARE_BODY (a, b, long double, __builtin_copysignl);
}
void
comparecl (_Complex long double a, long double r, long double i)
{
comparel (__real__ a, r);
comparel (__imag__ a, i);
}
#define VERIFY(A, B, TYPE, COMPARE) \
do { \
TYPE a = A; \
TYPE b = B; \
_Complex TYPE cr = __builtin_complex (a, b); \
static _Complex TYPE cs = __builtin_complex (A, B); \
COMPARE (cr, A, B); \
COMPARE (cs, A, B); \
} while (0)
#define ALL_CHECKS(PZ, NZ, NAN, INF, TYPE, COMPARE) \
do { \
VERIFY (NAN, NZ, TYPE, COMPARE); \
VERIFY (INF, NZ, TYPE, COMPARE); \
VERIFY (INF, NAN, TYPE, COMPARE); \
VERIFY (INF, INF, TYPE, COMPARE); \
} while (0)
void
check_long_double (void)
{
ALL_CHECKS (0.0l, -0.0l, __builtin_nanl(""), __builtin_infl(), long double, comparecl);
}