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| author | Zdenek Dvorak <dvorakz@suse.cz> | 2004-10-27 22:27:20 +0200 |
|---|---|---|
| committer | Zdenek Dvorak <rakdver@gcc.gnu.org> | 2004-10-27 20:27:20 +0000 |
| commit | 38b0dcb81effec70e61bb1e652c0cab254245115 (patch) | |
| tree | 36323e61beca852219425c346a9efad5a6b0dfb5 /gcc/tree-ssa-loop-niter.c | |
| parent | 89e73849fd8fe510b1e5b8b91b5ce1211d377f95 (diff) | |
| download | gcc-38b0dcb81effec70e61bb1e652c0cab254245115.zip gcc-38b0dcb81effec70e61bb1e652c0cab254245115.tar.gz gcc-38b0dcb81effec70e61bb1e652c0cab254245115.tar.bz2 | |
re PR tree-optimization/18048 (mgrid loop performance regression with ivopts (register pressure))
PR tree-optimization/18048
* fold-const.c (try_move_mult_to_index): New function.
(fold): Use try_move_mult_to_index.
* tree-ssa-loop-ivopts.c (try_add_cand_for): Prefer common candidates.
* tree-ssa-loop-niter.c (number_of_iterations_cond): Produce
an all-ones unsigned constant without extra bits.
* tree.c (build_low_bits_mask): New function.
* tree.h (build_low_bits_mask): Declare.
From-SVN: r89708
Diffstat (limited to 'gcc/tree-ssa-loop-niter.c')
| -rw-r--r-- | gcc/tree-ssa-loop-niter.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index b879b9e..496b3f3 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -419,9 +419,10 @@ number_of_iterations_cond (tree type, tree base0, tree step0, d = EXEC_BINARY (LSHIFT_EXPR, niter_type, build_int_cst_type (niter_type, 1), bits); s = EXEC_BINARY (RSHIFT_EXPR, niter_type, step0, bits); - bound = EXEC_BINARY (RSHIFT_EXPR, niter_type, - build_int_cst (niter_type, -1), - bits); + + bound = build_low_bits_mask (niter_type, + (TYPE_PRECISION (niter_type) + - tree_low_cst (bits, 1))); assumption = fold (build2 (FLOOR_MOD_EXPR, niter_type, base1, d)); assumption = fold (build2 (EQ_EXPR, boolean_type_node, |