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Limit depth for all GORI expressions. 

Apply the logical_depth limit ranger uses to all stmts with multiple ssa-names
to avoid excessive outgoing calculations.

	gcc/
	PR tree-optimization/103254
	* gimple-range-gori.cc (range_def_chain::get_def_chain): Limit the
	depth for all statements with multple ssa names.

	gcc/testsuite/
	* gcc.dg/pr103254.c: New.
This commit is contained in:
Andrew MacLeod 2021-11-17 14:14:06 -05:00
parent f47870e6a2
commit ee448a523d
2 changed files with 34 additions and 11 deletions
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20
gcc/gimple-range-gori.cc
View File

@ -331,7 +331,6 @@ range_def_chain::get_def_chain (tree name)
{
tree ssa1, ssa2, ssa3;
unsigned v = SSA_NAME_VERSION (name);
bool is_logical = false;
// If it has already been processed, just return the cached value.
if (has_def_chain (name))
@ -348,15 +347,6 @@ range_def_chain::get_def_chain (tree name)
gimple *stmt = SSA_NAME_DEF_STMT (name);
if (gimple_range_handler (stmt))
{
is_logical = is_gimple_logical_p (stmt);
// Terminate the def chains if we see too many cascading logical stmts.
if (is_logical)
{
if (m_logical_depth == param_ranger_logical_depth)
return NULL;
m_logical_depth++;
}
ssa1 = gimple_range_ssa_p (gimple_range_operand1 (stmt));
ssa2 = gimple_range_ssa_p (gimple_range_operand2 (stmt));
ssa3 = NULL_TREE;
@ -376,6 +366,14 @@ range_def_chain::get_def_chain (tree name)
return NULL;
}
// Terminate the def chains if we see too many cascading stmts.
if (m_logical_depth == param_ranger_logical_depth)
return NULL;
// Increase the depth if we have a pair of ssa-names.
if (ssa1 && ssa2)
m_logical_depth++;
register_dependency (name, ssa1, gimple_bb (stmt));
register_dependency (name, ssa2, gimple_bb (stmt));
register_dependency (name, ssa3, gimple_bb (stmt));
@ -383,7 +381,7 @@ range_def_chain::get_def_chain (tree name)
if (!ssa1 && !ssa2 & !ssa3)
set_import (m_def_chain[v], name, NULL);
if (is_logical)
if (ssa1 && ssa2)
m_logical_depth--;
return m_def_chain[v].bm;

25
gcc/testsuite/gcc.dg/pr103254.c Normal file
View File

@ -0,0 +1,25 @@
/* { dg-do compile } */
/* { dg-options "-O3" } */
/* { dg-timeout 10 } */
short int i;
void
foo (void)
{
for (i = 1; i < 2; i += 4)
{
int j;
for (j = 0; j < 5; j += 4)
{
int k;
for (k = 0; k < 68; k += 4)
{
i &= j;
j &= i;
}
}
}
}