OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Always track arguments, even when ignoring equiv params. 

To "ignore" ranges from equivalences, we should track the range separately,
but still do the other name processing which determiens if there is a single
name or not for equivalence.  Otherwise we mistakently think we can introduce
an equivalences.

	gcc/
	PR tree-optimization/103440
	* gimple-range-fold.cc (fold_using_range::range_of_phi): Continue
	normal param processing for equiv params.

	gcc/testsuite/
	* gcc.dg/pr103440.c: New.
This commit is contained in:
Andrew MacLeod 2021-11-29 09:19:34 -05:00
parent fa01e206c8
commit e43b15c88c
2 changed files with 33 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
gcc/gimple-range-fold.cc
View File

@ -795,20 +795,17 @@ fold_using_range::range_of_phi (irange &r, gphi *phi, fur_source &src)
// Get the range of the argument on its edge.
src.get_phi_operand (arg_range, arg, e);
// Likewise, if the incoming PHI argument is equivalent to this
// PHI definition, it provides no new info. Accumulate these ranges
// in case all arguments are equivalences.
if (src.query ()->query_relation (e, arg, phi_def, false) == EQ_EXPR)
{
single_arg = arg;
equiv_range.union_(arg_range);
continue;
}
if (!arg_range.undefined_p ())
{
// Register potential dependencies for stale value tracking.
r.union_ (arg_range);
// Likewise, if the incoming PHI argument is equivalent to this
// PHI definition, it provides no new info. Accumulate these ranges
// in case all arguments are equivalences.
if (src.query ()->query_relation (e, arg, phi_def, false) == EQ_EXPR)
equiv_range.union_(arg_range);
else
r.union_ (arg_range);
if (gimple_range_ssa_p (arg) && src.gori ())
src.gori ()->register_dependency (phi_def, arg);
@ -829,7 +826,7 @@ fold_using_range::range_of_phi (irange &r, gphi *phi, fur_source &src)
// If all arguments were equivalences, use the equivalence ranges as no
// arguments were processed.
if (!seen_arg)
if (r.undefined_p () && !equiv_range.undefined_p ())
r = equiv_range;
// If the PHI boils down to a single effective argument, look at it.

24
gcc/testsuite/gcc.dg/pr103440.c Normal file
View File

@ -0,0 +1,24 @@
/* { dg-do run } */
/* { dg-options "-Os" } */
/* { dg-timeout 10 } */
int a, b, c, d, e;
int main() {
int f = 2, g = 1, h = -3;
L1:
c = b ^ 1;
if (!f)
goto L3;
if (d)
g = e;
f = h;
if (!c)
goto L1;
L2:
if (g)
a = 0;
L3:
if (d == g)
goto L2;
return 0;
}