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From fb86109ebb10cdb82e1e3ffa37bb7e770fb7c066 Mon Sep 17 00:00:00 2001
From: eastb233 <xiezhiheng@huawei.com>
Date: Wed, 7 Dec 2022 09:43:15 +0800
Subject: [PATCH] [MULL64] Disable mull64 transformation by default
This commit disables mull64 transformation by default since
it shows some runtime failure in workloads.
---
gcc/match.pd | 2 +-
gcc/opts.c | 1 -
gcc/testsuite/g++.dg/tree-ssa/mull64.C | 2 +-
gcc/testsuite/gcc.dg/pr107190.c | 2 +-
4 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/gcc/match.pd b/gcc/match.pd
index 433682afb..01f81b063 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -3393,7 +3393,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(simplify
(cond @0 (op:s @1 integer_pow2p@2) @1)
/* powerof2cst */
- (if (INTEGRAL_TYPE_P (type))
+ (if (flag_merge_mull && INTEGRAL_TYPE_P (type))
(with {
tree shift = build_int_cst (integer_type_node, tree_log2 (@2));
}
diff --git a/gcc/opts.c b/gcc/opts.c
index 751965e46..f12b13599 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -511,7 +511,6 @@ static const struct default_options default_options_table[] =
{ OPT_LEVELS_2_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_CHEAP },
{ OPT_LEVELS_2_PLUS, OPT_finline_functions, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fmerge_mull, NULL, 1 },
/* -O2 and above optimizations, but not -Os or -Og. */
{ OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_functions, NULL, 1 },
diff --git a/gcc/testsuite/g++.dg/tree-ssa/mull64.C b/gcc/testsuite/g++.dg/tree-ssa/mull64.C
index f61cf5e6f..cad891e62 100644
--- a/gcc/testsuite/g++.dg/tree-ssa/mull64.C
+++ b/gcc/testsuite/g++.dg/tree-ssa/mull64.C
@@ -1,5 +1,5 @@
/* { dg-do compile } */
-/* { dg-options "-O2 -Wno-psabi -fdump-tree-forwprop1-details -fdump-tree-forwprop4-details" } */
+/* { dg-options "-O2 -fmerge-mull -Wno-psabi -fdump-tree-forwprop1-details -fdump-tree-forwprop4-details" } */
# define BN_BITS4 32
# define BN_MASK2 (0xffffffffffffffffL)
diff --git a/gcc/testsuite/gcc.dg/pr107190.c b/gcc/testsuite/gcc.dg/pr107190.c
index 235b2761a..d1e72e5df 100644
--- a/gcc/testsuite/gcc.dg/pr107190.c
+++ b/gcc/testsuite/gcc.dg/pr107190.c
@@ -1,5 +1,5 @@
/* { dg-do compile } */
-/* { dg-options "-O2 -fexpensive-optimizations -fdump-tree-phiopt2-details" } */
+/* { dg-options "-O2 -fmerge-mull -fexpensive-optimizations -fdump-tree-phiopt2-details" } */
# define BN_BITS4 32
# define BN_MASK2 (0xffffffffffffffffL)
--
2.25.1
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