https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19832
--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:3d86e7f4a8aef1b864a51660825597eafe9059b1 commit r14-3606-g3d86e7f4a8aef1b864a51660825597eafe9059b1 Author: Andrew Pinski <apin...@marvell.com> Date: Wed Aug 30 21:21:01 2023 -0700 MATCH [PR19832]: Optimize some `(a != b) ? a OP b : c` This patch adds the following match patterns to optimize these: /* (a != b) ? (a - b) : 0 -> (a - b) */ /* (a != b) ? (a ^ b) : 0 -> (a ^ b) */ /* (a != b) ? (a & b) : a -> (a & b) */ /* (a != b) ? (a | b) : a -> (a | b) */ /* (a != b) ? min(a,b) : a -> min(a,b) */ /* (a != b) ? max(a,b) : a -> max(a,b) */ /* (a != b) ? (a * b) : (a * a) -> (a * b) */ /* (a != b) ? (a + b) : (a + a) -> (a + b) */ /* (a != b) ? (a + b) : (2 * a) -> (a + b) */ Note currently only integer types (include vector types) are handled. Floating point types can be added later on. OK? Bootstrapped and tested on x86_64-linux-gnu. The first pattern had still shows up in GCC in cse.c's preferable function which was the original motivation for this patch. PR tree-optimization/19832 gcc/ChangeLog: * match.pd: Add pattern to optimize `(a != b) ? a OP b : c`. gcc/testsuite/ChangeLog: * g++.dg/opt/vectcond-1.C: New test. * gcc.dg/tree-ssa/phi-opt-same-1.c: New test.
