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tree-optimization/114246 - invalid call argument from DSE

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The following makes sure to strip type conversions added by
build_fold_addr_expr before placing the result in a call argument.

	PR tree-optimization/114246
	* tree-ssa-dse.cc (increment_start_addr): Strip useless
	type conversions from the adjusted address.

	* gcc.dg/torture/pr114246.c: New testcase.
This commit is contained in:
Richard Biener 2024-03-06 09:02:31 +01:00
parent 1157d5de35
commit 0249744a9f
2 changed files with 13 additions and 0 deletions
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11
gcc/testsuite/gcc.dg/torture/pr114246.c Normal file
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@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-additional-options "-w" } */
int a, b;
void
foo (void)
{
__builtin_memcpy (&a, (char *)&b - 1, 2);
__builtin_memcpy (&a, &b, 1);
}

2
gcc/tree-ssa-dse.cc
View file

@ -49,6 +49,7 @@ along with GCC; see the file COPYING3. If not see
#include "cfgloop.h"
#include "tree-data-ref.h"
#include "internal-fn.h"
#include "tree-ssa.h"
/* This file implements dead store elimination.
@ -658,6 +659,7 @@ increment_start_addr (gimple *stmt, tree *where, int increment)
*where,
build_int_cst (ptr_type_node,
increment)));
STRIP_USELESS_TYPE_CONVERSION (*where);
}
/* STMT is builtin call that writes bytes in bitmap ORIG, some bytes are dead