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re PR rtl-optimization/16590 (Incorrect execution when compiling with -O2)

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PR rtl-optimization/16590
	* gcse.c (pre_delete): Do not create invalid REG_EQUAL notes.

	PR rtl-optimization/16590
	* g++.dg/opt/loop1.C: New test.

From-SVN: r86732
This commit is contained in:
Mark Mitchell 2004-08-29 19:40:20 +00:00 committed by Mark Mitchell
parent 477a21f7f9
commit 5e9f78cc74
4 changed files with 37 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-08-29 Mark Mitchell <mark@codesourcery.com>
PR rtl-optimization/16590
* gcse.c (pre_delete): Do not create invalid REG_EQUAL notes.
2004-08-29 Diego Novillo <dnovillo@redhat.com>
* tree-ssa-ccp.c (ccp_visit_stmt): Remove #if 0 guards.

4
gcc/gcse.c
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@ -4463,7 +4463,9 @@ pre_delete (void)
expr->reaching_reg
= gen_reg_rtx (GET_MODE (SET_DEST (set)));
gcse_emit_move_after (expr->reaching_reg, SET_DEST (set), insn);
emit_insn_after (gen_move_insn (SET_DEST (set),
expr->reaching_reg),
insn);
delete_insn (insn);
occr->deleted_p = 1;
SET_BIT (pre_redundant_insns, INSN_CUID (insn));

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2004-08-29 Mark Mitchell <mark@codesourcery.com>
PR rtl-optimization/16590
* g++.dg/opt/loop1.C: New test.
2004-08-29 Tobias Schlueter <tobias.schlueter@physik.uni-muenchen.de>
PR fortran/13910

24
gcc/testsuite/g++.dg/opt/loop1.C Normal file
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@ -0,0 +1,24 @@
// PR rtl-optimization/16590
// { dg-do run }
// { dg-options "-O2" }
extern "C" void abort();
struct iterator {
char * p;
int *dummy;
};
static iterator pend(char * start) {
iterator p = {start, 0};
if (p.p == start) p.p = start+5;
--p.p;
return p;
}
int main() {
char mem[4+1];
if(pend(mem).p != mem+4)
abort ();
}