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| author | Richard Guenther <rguenther@suse.de> | 2009-06-17 10:26:24 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2009-06-17 10:26:24 +0000 |
| commit | 3cb8677cc030b145391ac547f159609b03dbbd6c (patch) | |
| tree | 6565fa35aaddaec6451161a08051d6b81e16a68d /gcc/tree-chrec.c | |
| parent | d81b4c614be057ac515828a6b7a92745a542c551 (diff) | |
| download | gcc-3cb8677cc030b145391ac547f159609b03dbbd6c.tar.gz | |
re PR middle-end/40460 (Enormous memory usage during compilation with -O2 or -O3 optimizations.)
2009-06-17 Richard Guenther <rguenther@suse.de>
PR middle-end/40460
* tree-chrec.h (build_polynomial_chrec): If we cannot determine
if there is no evolution of left in the loop bail out.
* tree-chrec.c (chrec_fold_multiply_poly_poly): CSE one
chrec_fold_multiply.
* g++.dg/torture/pr40460.C: New testcase.
From-SVN: r148593
Diffstat (limited to 'gcc/tree-chrec.c')
| -rw-r--r-- | gcc/tree-chrec.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/gcc/tree-chrec.c b/gcc/tree-chrec.c index 495f95a8be7..997ce893593 100644 --- a/gcc/tree-chrec.c +++ b/gcc/tree-chrec.c @@ -220,16 +220,16 @@ chrec_fold_multiply_poly_poly (tree type, /* "a*c". */ t0 = chrec_fold_multiply (type, CHREC_LEFT (poly0), CHREC_LEFT (poly1)); - /* "a*d + b*c + b*d". */ + /* "a*d + b*c". */ t1 = chrec_fold_multiply (type, CHREC_LEFT (poly0), CHREC_RIGHT (poly1)); t1 = chrec_fold_plus (type, t1, chrec_fold_multiply (type, CHREC_RIGHT (poly0), CHREC_LEFT (poly1))); - t1 = chrec_fold_plus (type, t1, chrec_fold_multiply (type, - CHREC_RIGHT (poly0), - CHREC_RIGHT (poly1))); - /* "2*b*d". */ + /* "b*d". */ t2 = chrec_fold_multiply (type, CHREC_RIGHT (poly0), CHREC_RIGHT (poly1)); + /* "a*d + b*c + b*d". */ + t1 = chrec_fold_plus (type, t1, t2); + /* "2*b*d". */ t2 = chrec_fold_multiply (type, SCALAR_FLOAT_TYPE_P (type) ? build_real (type, dconst2) : build_int_cst (type, 2), t2); |