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[Bug tree-optimization/23134] New: Address escapes even though the called function does not cause it to escape
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 29 Jul 2005 13:40:02 -0000
- Subject: [Bug tree-optimization/23134] New: Address escapes even though the called function does not cause it to escape
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
Take this "stupid" example (even though this most likely shows up in GCC but I don't know for sure):
int g1(int);
static void h(int *a) { *a = 1; }
int g(void)
{
int t = 0;
h(&t);
int t1 = t;
g1(t1);
return t1 == t;
}
That return should have been turned into "return 1" as t does not escape via h as h only touches it.
Compile with -O3 -fno-inline to see the problem.
--
Summary: Address escapes even though the called function does not
cause it to escape
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23134