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[Bug tree-optimization/40921] missed optimization: x + (-y * z * z) => x - y * z * z
- From: "kugan at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sun, 22 May 2016 08:13:45 +0000
- Subject: [Bug tree-optimization/40921] missed optimization: x + (-y * z * z) => x - y * z * z
- Auto-submitted: auto-generated
- References: <bug-40921-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40921
--- Comment #5 from kugan at gcc dot gnu.org ---
Author: kugan
Date: Sun May 22 08:13:13 2016
New Revision: 236564
URL: https://gcc.gnu.org/viewcvs?rev=236564&root=gcc&view=rev
Log:
gcc/testsuite/ChangeLog:
2016-05-22 Kugan Vivekanandarajah <kuganv@linaro.org>
PR middle-end/40921
* gcc.dg/tree-ssa/pr40921.c: New test.
gcc/ChangeLog:
2016-05-22 Kugan Vivekanandarajah <kuganv@linaro.org>
PR middle-end/40921
* tree-ssa-reassoc.c (try_special_add_to_ops): New.
(linearize_expr_tree): Call try_special_add_to_ops.
(reassociate_bb): Convert MULT_EXPR by (-1) to NEGATE_EXPR.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr40921.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-reassoc.c