From 9b1de7e2e8e99eabf2b8d1ef74eb57fbd41bc730 Mon Sep 17 00:00:00 2001 From: Richard Sandiford Date: Wed, 1 Nov 2017 09:41:48 +0000 Subject: Add more vec_duplicate simplifications This patch adds a vec_duplicate_p helper that tests for constant or non-constant vector duplicates. Together with the existing const_vec_duplicate_p, this complements the gen_vec_duplicate and gen_const_vec_duplicate added by a previous patch. The patch uses the new routines to add more rtx simplifications involving vector duplicates. These mirror simplifications that we already do for CONST_VECTOR broadcasts and are needed for variable-length SVE, which uses: (const:M (vec_duplicate:M X)) to represent constant broadcasts instead. The simplifications do trigger on the testsuite for variable duplicates too, and in each case I saw the change was an improvement. The best way of testing the new simplifications seemed to be via selftests. The patch cribs part of David's patch here: https://gcc.gnu.org/ml/gcc-patches/2016-07/msg00270.html . 2017-11-01 Richard Sandiford David Malcolm Alan Hayward David Sherwood gcc/ * rtl.h (vec_duplicate_p): New function. * selftest-rtl.c (assert_rtx_eq_at): New function. * selftest-rtl.h (ASSERT_RTX_EQ): New macro. (assert_rtx_eq_at): Declare. * selftest.h (selftest::simplify_rtx_c_tests): Declare. * selftest-run-tests.c (selftest::run_tests): Call it. * simplify-rtx.c: Include selftest.h and selftest-rtl.h. (simplify_unary_operation_1): Recursively handle vector duplicates. (simplify_binary_operation_1): Likewise. Handle VEC_SELECTs of vector duplicates. (simplify_subreg): Handle subregs of vector duplicates. (make_test_reg, test_vector_ops_duplicate, test_vector_ops) (selftest::simplify_rtx_c_tests): New functions. Co-Authored-By: Alan Hayward Co-Authored-By: David Malcolm Co-Authored-By: David Sherwood From-SVN: r254294 --- gcc/selftest.h | 1 + 1 file changed, 1 insertion(+) (limited to 'gcc/selftest.h') diff --git a/gcc/selftest.h b/gcc/selftest.h index 6478922..cdad939 100644 --- a/gcc/selftest.h +++ b/gcc/selftest.h @@ -199,6 +199,7 @@ extern void unique_ptr_tests_cc_tests (); extern void vec_c_tests (); extern void wide_int_cc_tests (); extern void predict_c_tests (); +extern void simplify_rtx_c_tests (); extern int num_passes; -- cgit v1.1