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Propagate nondeterministic and side_effects flags in modref summary after inlining 

gcc/ChangeLog:

2022-04-09  Jan Hubicka  <hubicka@ucw.cz>

	* ipa-modref.cc (ipa_merge_modref_summary_after_inlining): Propagate
	nondeterministic and side_effects flags.

gcc/testsuite/ChangeLog:

2022-04-09  Jan Hubicka  <hubicka@ucw.cz>

	* gcc.dg/ipa/pr105160.c: New test.
This commit is contained in:
Jan Hubicka 2022-04-09 21:05:52 +02:00
parent c8f7324e81
commit aabb9a261e
2 changed files with 100 additions and 0 deletions
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23
gcc/ipa-modref.cc
View File

@ -5281,6 +5281,29 @@ ipa_merge_modref_summary_after_inlining (cgraph_edge *edge)
if (!ignore_stores)
to_info_lto->stores->collapse ();
}
/* Merge side effects and non-determinism.
PURE/CONST flags makes functions deterministic and if there is
no LOOPING_CONST_OR_PURE they also have no side effects. */
if (!(flags & (ECF_CONST | ECF_NOVOPS | ECF_PURE))
|| (flags & ECF_LOOPING_CONST_OR_PURE))
{
if (to_info)
{
if (!callee_info || callee_info->side_effects)
to_info->side_effects = true;
if ((!callee_info || callee_info->nondeterministic)
&& !ignore_nondeterminism_p (edge->caller->decl, flags))
to_info->nondeterministic = true;
}
if (to_info_lto)
{
if (!callee_info_lto || callee_info_lto->side_effects)
to_info_lto->side_effects = true;
if ((!callee_info_lto || callee_info_lto->nondeterministic)
&& !ignore_nondeterminism_p (edge->caller->decl, flags))
to_info_lto->nondeterministic = true;
}
}
if (callee_info || callee_info_lto)
{
auto_vec <modref_parm_map, 32> parm_map;

77
gcc/testsuite/gcc.dg/ipa/pr105160.c Normal file
View File

@ -0,0 +1,77 @@
/* { dg-do compile } */
/* { dg-options "-O -fdump-ipa-modref" } */
#define sysreg_read(regname) \
({ \
unsigned long __sr_val; \
asm volatile(""); \
\
__sr_val; \
})
#define sysreg_write(regname, __sw_val) \
do { \
asm volatile(""); \
} while (0)
#define isb() \
do { \
asm volatile( \
"isb" \
: \
: \
: "memory"); \
} while (0)
static unsigned long sctlr_read(void)
{
return sysreg_read(sctlr_el1);
}
static void sctlr_write(unsigned long val)
{
sysreg_write(sctlr_el1, val);
}
static void sctlr_rmw(void)
{
unsigned long val;
val = sctlr_read();
val |= 1UL << 7;
sctlr_write(val);
}
void sctlr_read_multiple(void)
{
sctlr_read();
sctlr_read();
sctlr_read();
sctlr_read();
}
void sctlr_write_multiple(void)
{
sctlr_write(0);
sctlr_write(0);
sctlr_write(0);
sctlr_write(0);
sctlr_write(0);
}
void sctlr_rmw_multiple(void)
{
sctlr_rmw();
sctlr_rmw();
sctlr_rmw();
sctlr_rmw();
}
void function(void)
{
sctlr_read_multiple();
sctlr_write_multiple();
sctlr_rmw_multiple();
isb();
}
/* { dg-final { scan-ipa-dump-not "Function found to be const" "modref" } } */