in function fold, we can find following code snippet:
5547 else if (TREE_CODE_CLASS (code) == '<'
5548 && TREE_CODE (arg0) == COMPOUND_EXPR)
5549 return build (COMPOUND_EXPR, type, TREE_OPERAND (arg0, 0),
5550 fold (build (code, type, TREE_OPERAND (arg0, 1), arg1)));
5551 else if (TREE_CODE_CLASS (code) == '<'
5552 && TREE_CODE (arg1) == COMPOUND_EXPR)
5553 return build (COMPOUND_EXPR, type, TREE_OPERAND (arg1, 0),
5554 fold (build (code, type, arg0, TREE_OPERAND (arg1, 1))));
These lines of code can be removed, as following code fragement covers the
case. And what's more the condition at line 5552 is not correct, the correct
condition should include TREE_OPERAND (arg1, 0) and arg0 without side-effect.
This deficiency is not present v4.3.0
--
Summary: Code deficiency in function fold
Product: gcc
Version: 3.4.6
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: wuhui1973 at 21cn dot com
GCC build triplet: linux-i386
GCC host triplet: linux-i386
GCC target triplet: linux-i386
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37822
