From 078339fc04f5de59e55de8c54f4504b7672d60d0 Mon Sep 17 00:00:00 2001 From: Andrew Pinski Date: Fri, 28 Apr 2023 12:45:19 -0700 Subject: [PATCH] MATCH: Port CLRSB part of builtin_zero_pattern This ports the clrsb builtin part of builtin_zero_pattern to match.pd. A simple pattern to port. OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. gcc/ChangeLog: * match.pd (a != 0 ? CLRSB(a) : CST -> CLRSB(a)): New pattern. --- gcc/match.pd | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/gcc/match.pd b/gcc/match.pd index b14b7017c9a5..08a4f8ebdc1e 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -7787,6 +7787,14 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) (cond (ne @0 integer_zerop@1) (func@3 (convert? @0)) integer_zerop@2) @3)) +/* a != 0 ? FUN(a) : CST -> Fun(a) for some CLRSB builtins + where CST is precision-1. */ +(for func (CLRSB) + (simplify + (cond (ne @0 integer_zerop@1) (func@4 (convert?@3 @0)) INTEGER_CST@2) + (if (wi::to_widest (@2) == TYPE_PRECISION (TREE_TYPE (@3)) - 1) + @4))) + #if GIMPLE /* a != 0 ? CLZ(a) : CST -> .CLZ(a) where CST is the result of the internal function for 0. */ (for func (CLZ)