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re PR middle-end/37261 (Spurious (?) "integer overflow in expression" warnings)

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PR c/37261
	* fold-const.c (fold_binary): In (X | C1) & C2 canonicalization
	compute new & and | in type rather than TREE_TYPE (arg0).

	* gcc.dg/pr37261.c: New test.

From-SVN: r139784
This commit is contained in:
Jakub Jelinek 2008-08-29 20:59:13 +02:00 committed by Jakub Jelinek
parent 98c0cbd30a
commit bf09f0e0e9
4 changed files with 29 additions and 8 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
2008-08-29 Jakub Jelinek <jakub@redhat.com>
PR c/37261
* fold-const.c (fold_binary): In (X | C1) & C2 canonicalization
compute new & and | in type rather than TREE_TYPE (arg0).
* dwarf2out.c (fortran_common): Update comment.
(gen_variable_die): Swap com_die and var_die variables in Fortran
COMMON block handling code.

13
gcc/fold-const.c
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@ -10737,14 +10737,13 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1)
&& TREE_CODE (arg1) == INTEGER_CST
&& TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST)
{
tree tmp1 = fold_convert (TREE_TYPE (arg0), arg1);
tree tmp2 = fold_build2 (BIT_AND_EXPR, TREE_TYPE (arg0),
TREE_OPERAND (arg0, 0), tmp1);
tree tmp3 = fold_build2 (BIT_AND_EXPR, TREE_TYPE (arg0),
TREE_OPERAND (arg0, 1), tmp1);
tree tmp1 = fold_convert (type, arg1);
tree tmp2 = fold_convert (type, TREE_OPERAND (arg0, 0));
tree tmp3 = fold_convert (type, TREE_OPERAND (arg0, 1));
tmp2 = fold_build2 (BIT_AND_EXPR, type, tmp2, tmp1);
tmp3 = fold_build2 (BIT_AND_EXPR, type, tmp3, tmp1);
return fold_convert (type,
fold_build2 (BIT_IOR_EXPR, TREE_TYPE (arg0),
tmp2, tmp3));
fold_build2 (BIT_IOR_EXPR, type, tmp2, tmp3));
}
/* (X | Y) & Y is (X, Y). */

5
gcc/testsuite/ChangeLog
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@ -1,4 +1,7 @@
2008-08-22 Jakub Jelinek <jakub@redhat.com>
2008-08-29 Jakub Jelinek <jakub@redhat.com>
PR c/37261
* gcc.dg/pr37261.c: New test.
PR fortran/23057
* gfortran.dg/debug/pr35154-dwarf2.f: Adjust for replacement

15
gcc/testsuite/gcc.dg/pr37261.c Normal file
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@ -0,0 +1,15 @@
/* PR c/37261 */
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
unsigned
foo (int x)
{
unsigned a = ((x & 1) | 2) & 0x80000000; /* { dg-bogus "integer overflow in expression" } */
unsigned b = ((x & 2) | 2) & 0x80000000; /* { dg-bogus "integer overflow in expression" } */
unsigned c = ((x & 4) | 2) & 0x80000000; /* { dg-bogus "integer overflow in expression" } */
return a + b + c;
}
/* { dg-final { scan-tree-dump "return 0" "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */