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File _service:tar_scm:0060-Backport-Optimize-x-0-y-y-to-x-31-y-in-match.pd.patch of Package gcc
From 4352b952ba24c413697fcfc191d06165a8a31ced Mon Sep 17 00:00:00 2001 From: Andrew Pinski <apinski@marvell.com> Date: Sat, 22 May 2021 19:49:50 +0000 Subject: [PATCH 12/35] [Backport] Optimize x < 0 ? ~y : y to (x >> 31) ^ y in match.pd Reference: https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=1fd76b24306ed4df4cf9e797d900699ed59ce7f7 This copies the optimization that is done in phiopt for "x < 0 ? ~y : y to (x >> 31) ^ y" into match.pd. The code for phiopt is kept around until phiopt uses match.pd (which I am working towards). Note the original testcase is now optimized early on and I added a new testcase to optimize during phiopt. OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. Thanks, Andrew Pinski Differences from v1: V2: Add check for integeral type to make sure vector types are not done. gcc: * match.pd (x < 0 ? ~y : y): New patterns. gcc/testsuite: * gcc.dg/tree-ssa/pr96928.c: Update test for slightly different IR. * gcc.dg/tree-ssa/pr96928-1.c: New testcase. --- gcc/match.pd | 32 +++++++++++++++ gcc/testsuite/gcc.dg/tree-ssa/pr96928-1.c | 48 +++++++++++++++++++++++ gcc/testsuite/gcc.dg/tree-ssa/pr96928.c | 7 +++- 3 files changed, 85 insertions(+), 2 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/pr96928-1.c diff --git a/gcc/match.pd b/gcc/match.pd index 032830b0d..5899eea95 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -4390,6 +4390,38 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) (cmp (bit_and@2 @0 integer_pow2p@1) @1) (icmp @2 { build_zero_cst (TREE_TYPE (@0)); }))) +(for cmp (ge lt) +/* x < 0 ? ~y : y into (x >> (prec-1)) ^ y. */ +/* x >= 0 ? ~y : y into ~((x >> (prec-1)) ^ y). */ + (simplify + (cond (cmp @0 integer_zerop) (bit_not @1) @1) + (if (INTEGRAL_TYPE_P (type) + && INTEGRAL_TYPE_P (TREE_TYPE (@0)) + && !TYPE_UNSIGNED (TREE_TYPE (@0)) + && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (type)) + (with + { + tree shifter = build_int_cst (integer_type_node, TYPE_PRECISION (type) - 1); + } + (if (cmp == LT_EXPR) + (bit_xor (convert (rshift @0 {shifter;})) @1) + (bit_not (bit_xor (convert (rshift @0 {shifter;})) @1)))))) +/* x < 0 ? y : ~y into ~((x >> (prec-1)) ^ y). */ +/* x >= 0 ? y : ~y into (x >> (prec-1)) ^ y. */ + (simplify + (cond (cmp @0 integer_zerop) @1 (bit_not @1)) + (if (INTEGRAL_TYPE_P (type) + && INTEGRAL_TYPE_P (TREE_TYPE (@0)) + && !TYPE_UNSIGNED (TREE_TYPE (@0)) + && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (type)) + (with + { + tree shifter = build_int_cst (integer_type_node, TYPE_PRECISION (type) - 1); + } + (if (cmp == GE_EXPR) + (bit_xor (convert (rshift @0 {shifter;})) @1) + (bit_not (bit_xor (convert (rshift @0 {shifter;})) @1))))))) + /* If we have (A & C) != 0 ? D : 0 where C and D are powers of 2, convert this into a shift followed by ANDing with D. */ (simplify diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr96928-1.c b/gcc/testsuite/gcc.dg/tree-ssa/pr96928-1.c new file mode 100644 index 000000000..a2770e5e8 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr96928-1.c @@ -0,0 +1,48 @@ +/* PR tree-optimization/96928 */ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-phiopt2" } */ +/* { dg-final { scan-tree-dump-times " = a_\[0-9]*\\\(D\\\) >> " 5 "phiopt2" } } */ +/* { dg-final { scan-tree-dump-times " = ~c_\[0-9]*\\\(D\\\);" 1 "phiopt2" } } */ +/* { dg-final { scan-tree-dump-times " = ~" 1 "phiopt2" } } */ +/* { dg-final { scan-tree-dump-times " = \[abc_0-9\\\(\\\)D]* \\\^ " 5 "phiopt2" } } */ +/* { dg-final { scan-tree-dump-not "a < 0" "phiopt2" } } */ + +int +foo (int a) +{ + if (a < 0) + return ~a; + return a; +} + +int +bar (int a, int b) +{ + if (a < 0) + return ~b; + return b; +} + +unsigned +baz (int a, unsigned int b) +{ + if (a < 0) + return ~b; + return b; +} + +unsigned +qux (int a, unsigned int c) +{ + if (a >= 0) + return ~c; + return c; +} + +int +corge (int a, int b) +{ + if (a >= 0) + return b; + return ~b; +} diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr96928.c b/gcc/testsuite/gcc.dg/tree-ssa/pr96928.c index 209135726..e8fd82fc2 100644 --- a/gcc/testsuite/gcc.dg/tree-ssa/pr96928.c +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr96928.c @@ -1,8 +1,11 @@ /* PR tree-optimization/96928 */ /* { dg-do compile } */ -/* { dg-options "-O2 -fdump-tree-phiopt2" } */ +/* { dg-options "-O2 -fdump-tree-phiopt2 -fdump-tree-optimized" } */ /* { dg-final { scan-tree-dump-times " = a_\[0-9]*\\\(D\\\) >> " 5 "phiopt2" } } */ -/* { dg-final { scan-tree-dump-times " = ~c_\[0-9]*\\\(D\\\);" 1 "phiopt2" } } */ +/* The following check is done at optimized because a ^ (~b) is rewritten as ~(a^b) + and in the case of match.pd optimizing these ?:, the ~ is moved out already + by the time we get to phiopt2. */ +/* { dg-final { scan-tree-dump-times "\\\^ c_\[0-9]*\\\(D\\\);" 1 "optimized" } } */ /* { dg-final { scan-tree-dump-times " = ~" 1 "phiopt2" } } */ /* { dg-final { scan-tree-dump-times " = \[abc_0-9\\\(\\\)D]* \\\^ " 5 "phiopt2" } } */ /* { dg-final { scan-tree-dump-not "a < 0" "phiopt2" } } */ -- 2.27.0.windows.1
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