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File _service:tar_scm:0006-MULL64-1-3-Add-A-B-op-CST-B-match-and-simplify-optim.patch of Package gcc
From e7013d2640d82e928ebdaf830b6833051ac65296 Mon Sep 17 00:00:00 2001 From: zhongyunde <zhongyunde@huawei.com> Date: Sat, 5 Nov 2022 13:22:33 +0800 Subject: [PATCH 06/22] [MULL64 1/3] Add A ? B op CST : B match and simplify optimizations Refer to commit b6bdd7a4, use pattern match to simple A ? B op CST : B (where CST is power of 2) simplifications. Fixes the 1st issue of https://gitee.com/openeuler/gcc/issues/I5TSG0?from=project-issue. gcc/ * match.pd (A ? B op CST : B): Add simplifcations for A ? B op POW2 : B gcc/testsuite/ * gcc.dg/pr107190.c: New test. --- gcc/match.pd | 21 +++++++++++++++++++++ gcc/testsuite/gcc.dg/pr107190.c | 27 +++++++++++++++++++++++++++ 2 files changed, 48 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/pr107190.c diff --git a/gcc/match.pd b/gcc/match.pd index fc2833bbd..fd0857fc9 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -4280,6 +4280,27 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) ) #endif +#if GIMPLE +(if (canonicalize_math_p ()) +/* These patterns are mostly used by PHIOPT to move some operations outside of + the if statements. They should be done late because it gives jump threading + and few other passes to reduce what is going on. */ +/* a ? x op C : x -> x op (a << log2(C)) when C is power of 2. */ + (for op (plus minus bit_ior bit_xor lshift rshift lrotate rrotate) + (simplify + (cond @0 (op:s @1 integer_pow2p@2) @1) + /* powerof2cst */ + (if (INTEGRAL_TYPE_P (type)) + (with { + tree shift = build_int_cst (integer_type_node, tree_log2 (@2)); + } + (op @1 (lshift (convert (convert:boolean_type_node @0)) { shift; }))) + ) + ) + ) +) +#endif + /* Simplification moved from fold_cond_expr_with_comparison. It may also be extended. */ /* This pattern implements two kinds simplification: diff --git a/gcc/testsuite/gcc.dg/pr107190.c b/gcc/testsuite/gcc.dg/pr107190.c new file mode 100644 index 000000000..235b2761a --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr107190.c @@ -0,0 +1,27 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fexpensive-optimizations -fdump-tree-phiopt2-details" } */ + +# define BN_BITS4 32 +# define BN_MASK2 (0xffffffffffffffffL) +# define BN_MASK2l (0xffffffffL) +# define BN_MASK2h (0xffffffff00000000L) +# define BN_MASK2h1 (0xffffffff80000000L) +# define LBITS(a) ((a)&BN_MASK2l) +# define HBITS(a) (((a)>>BN_BITS4)&BN_MASK2l) +# define L2HBITS(a) (((a)<<BN_BITS4)&BN_MASK2) + +unsigned int test_m(unsigned long in0, unsigned long in1) { + unsigned long m, m1, lt, ht, bl, bh; + lt = LBITS(in0); + ht = HBITS(in0); + bl = LBITS(in1); + bh = HBITS(in1); + m = bh * lt; + m1 = bl * ht; + ht = bh * ht; + m = (m + m1) & BN_MASK2; + if (m < m1) ht += L2HBITS((unsigned long)1); + return ht + m; +} + +/* { dg-final { scan-tree-dump "COND_EXPR in block 2 and PHI in block 4 converted to straightline code" "phiopt2" } } */ -- 2.33.0
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