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re PR tree-optimization/18298 (bad code from lim ssa pass with strcmp)

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2004-11-30  Andrew Pinski  <pinskia@physics.uc.edu>

        PR tree-opt/18298
        * tree-optimize.c (init_tree_optimization_passes): Add a may_alias
        pass right after fold builtins.
2004-11-30  Andrew Pinski  <pinskia@physics.uc.edu>

        PR tree-opt/18298
        * gcc.c-torture/execute/p18298.c: New test.

From-SVN: r91529
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Andrew Pinski 2004-11-30 15:38:43 +00:00 committed by Andrew Pinski
parent 00bda9206b
commit 209e170cf4
4 changed files with 33 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-11-30 Andrew Pinski <pinskia@physics.uc.edu>
PR tree-opt/18298
* tree-optimize.c (init_tree_optimization_passes): Add a may_alias
pass right after fold builtins.
2004-11-30 Andreas Krebbel <krebbel1@de.ibm.com>
* config/s390/s390-modes.def: Added cc modes documentation.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2004-11-30 Andrew Pinski <pinskia@physics.uc.edu>
PR tree-opt/18298
* gcc.c-torture/execute/p18298.c: New test.
2004-11-30 Ira Rosen <irar@il.ibm.com>
Dorit Naishlos <dorit@il.ibm.com>

18
gcc/testsuite/gcc.c-torture/execute/p18298.c Normal file
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@ -0,0 +1,18 @@
#include <stdbool.h>
#include <stdlib.h>
int strcmp (const char*, const char*);
char s[2048] = "a";
inline bool foo(const char *str) {
return !strcmp(s,str);
}
int main() {
int i = 0;
while(!(foo(""))) {
i ++;
s[0] = '\0';
if (i>2)
abort ();
}
return 0;
}

4
gcc/tree-optimize.c
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@ -372,6 +372,10 @@ init_tree_optimization_passes (void)
NEXT_PASS (pass_ccp);
NEXT_PASS (pass_redundant_phi);
NEXT_PASS (pass_fold_builtins);
/* FIXME: May alias should a TODO but for 4.0.0,
we add may_alias right after fold builtins
which can create arbitrary GIMPLE. */
NEXT_PASS (pass_may_alias);
NEXT_PASS (pass_split_crit_edges);
NEXT_PASS (pass_pre);
NEXT_PASS (pass_loop);