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tree-optimization/105109 - bogus uninit diagnostic with _Complex

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When update_address_taken rewrites a _Complex into SSA it changes
stores to real/imaginary parts to loads of the other component and
a COMPLEX_EXPR.  That matches what gimplification does but it misses
suppression of diagnostics for the load of the other component.
The following patch adds that, syncing up gimplification and
update_address_taken behavior.

2022-03-31  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/105109
	* tree-ssa.cc (execute_update_addresses_taken): Suppress
	diagnostics on the load of the other complex component.

	* gcc.dg/uninit-pr105109.c: New testcase.
This commit is contained in:
Richard Biener 2022-03-31 09:21:27 +02:00
parent bf4832d6fa
commit 97ad0b8313
2 changed files with 16 additions and 0 deletions
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15
gcc/testsuite/gcc.dg/uninit-pr105109.c Normal file
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@ -0,0 +1,15 @@
/* { dg-do compile } */
/* { dg-options "-O -Wuninitialized" } */
static void foo(int dim,float _Complex f0[])
{
int d;
f0[0] -= 3.14; /* { dg-bogus "uninitialized" } */
for (d = 0; d < dim; ++d) f0[0] += 3.14;
}
void bar(int dim, const float _Complex u_t[], float _Complex f0[])
{
float _Complex exp[1] = {0.};
foo(dim, exp);
f0[0] = u_t[0] - exp[0];
}

1
gcc/tree-ssa.cc
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@ -1905,6 +1905,7 @@ execute_update_addresses_taken (void)
? REALPART_EXPR : IMAGPART_EXPR,
TREE_TYPE (other),
TREE_OPERAND (lhs, 0));
suppress_warning (lrhs);
gimple *load = gimple_build_assign (other, lrhs);
location_t loc = gimple_location (stmt);
gimple_set_location (load, loc);