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tree-optimization/98786 - fix issue with phiopt and abnormals

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This fixes factor_out_conditional_conversion to avoid creating overlapping
lifetimes for abnormals.  It also makes sure we do deal with a conditional
conversion (at least for one PHI arg def) - for the testcase that wasn't the case.

2021-01-22  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/98786
	* tree-ssa-phiopt.c (factor_out_conditional_conversion): Avoid
	adding new uses of abnormals.  Verify we deal with a conditional
	conversion.

	* gcc.dg/torture/pr98786.c: New testcase.
This commit is contained in:
Richard Biener 2021-01-22 10:34:42 +01:00
parent 4e3beaca15
commit fd61ca67f9
2 changed files with 38 additions and 0 deletions
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23
gcc/testsuite/gcc.dg/torture/pr98786.c Normal file
View File

@ -0,0 +1,23 @@
/* { dg-do compile } */
/* { dg-additional-options "-fno-tree-dce" } */
void
func_30 (void);
int __attribute__ ((pure, returns_twice))
func_38 (int g_15, int p_39)
{
return !!g_15 ? p_39 : 0;
}
void
func_26 (int func_26___trans_tmp_1)
{
long int l_37 = 0;
int __trans_tmp_1;
func_26___trans_tmp_1 = func_38 (func_26___trans_tmp_1, 1);
__trans_tmp_1 = func_38 (func_26___trans_tmp_1, l_37);
l_37 = 1;
func_30 ();
}

15
gcc/tree-ssa-phiopt.c
View File

@ -474,6 +474,9 @@ factor_out_conditional_conversion (edge e0, edge e1, gphi *phi,
if (!is_gimple_reg_type (TREE_TYPE (new_arg0)))
return NULL;
}
if (TREE_CODE (new_arg0) == SSA_NAME
&& SSA_NAME_OCCURS_IN_ABNORMAL_PHI (new_arg0))
return NULL;
if (TREE_CODE (arg1) == SSA_NAME)
{
@ -484,13 +487,25 @@ factor_out_conditional_conversion (edge e0, edge e1, gphi *phi,
|| gimple_assign_rhs_code (arg1_def_stmt) != convert_code)
return NULL;
/* Either arg1_def_stmt or arg0_def_stmt should be conditional. */
if (dominated_by_p (CDI_DOMINATORS, gimple_bb (phi), gimple_bb (arg0_def_stmt))
&& dominated_by_p (CDI_DOMINATORS,
gimple_bb (phi), gimple_bb (arg1_def_stmt)))
return NULL;
/* Use the RHS as new_arg1. */
new_arg1 = gimple_assign_rhs1 (arg1_def_stmt);
if (convert_code == VIEW_CONVERT_EXPR)
new_arg1 = TREE_OPERAND (new_arg1, 0);
if (TREE_CODE (new_arg1) == SSA_NAME
&& SSA_NAME_OCCURS_IN_ABNORMAL_PHI (new_arg1))
return NULL;
}
else
{
/* arg0_def_stmt should be conditional. */
if (dominated_by_p (CDI_DOMINATORS, gimple_bb (phi), gimple_bb (arg0_def_stmt)))
return NULL;
/* If arg1 is an INTEGER_CST, fold it to new type. */
if (INTEGRAL_TYPE_P (TREE_TYPE (new_arg0))
&& int_fits_type_p (arg1, TREE_TYPE (new_arg0)))