OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

tree-optimization/103204 - fix missed valueization in VN 

The following fixes a missed valueization when simplifying
a MEM[&...] combination during valueization.

2021-11-12  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/103204
	* tree-ssa-sccvn.c (valueize_refs_1): Re-valueize the
	top operand after folding in an address.

	* gcc.dg/torture/pr103204.c: New testcase.
This commit is contained in:
Richard Biener 2021-11-12 09:09:29 +01:00
parent c60ded6f5e
commit 140346fa24
2 changed files with 24 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
gcc/testsuite/gcc.dg/torture/pr103204.c Normal file
View File

@ -0,0 +1,16 @@
/* { dg-do compile } */
int a[1][1];
int b, c;
void d()
{
int e;
int f[0];
int *g;
for (; e;)
c = b;
if (a[0][b] = (__UINTPTR_TYPE__)f != 3)
g = &f[b];
int h;
*g = *g = *g = h;
}

13
gcc/tree-ssa-sccvn.c
View File

@ -1640,13 +1640,12 @@ static void
valueize_refs_1 (vec<vn_reference_op_s> *orig, bool *valueized_anything,
bool with_avail = false)
{
vn_reference_op_t vro;
unsigned int i;
*valueized_anything = false;
FOR_EACH_VEC_ELT (*orig, i, vro)
for (unsigned i = 0; i < orig->length (); ++i)
{
re_valueize:
vn_reference_op_t vro = &(*orig)[i];
if (vro->opcode == SSA_NAME
|| (vro->op0 && TREE_CODE (vro->op0) == SSA_NAME))
{
@ -1694,7 +1693,11 @@ valueize_refs_1 (vec<vn_reference_op_s> *orig, bool *valueized_anything,
&& (*orig)[i - 1].opcode == MEM_REF)
{
if (vn_reference_maybe_forwprop_address (orig, &i))
*valueized_anything = true;
{
*valueized_anything = true;
/* Re-valueize the current operand. */
goto re_valueize;
}
}
/* If it transforms a non-constant ARRAY_REF into a constant
one, adjust the constant offset. */