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* [gcc r11-3199] tree-optimization/94234 - Fold plusminus_mult expr with multi-use operands
@ 2020-09-15 3:15 Feng Xue
0 siblings, 0 replies; only message in thread
From: Feng Xue @ 2020-09-15 3:15 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:f9d2def016410a2095df6b399097b482f82064a5
commit r11-3199-gf9d2def016410a2095df6b399097b482f82064a5
Author: Feng Xue <fxue@os.amperecomputing.com>
Date: Tue Sep 1 17:17:58 2020 +0800
tree-optimization/94234 - Fold plusminus_mult expr with multi-use operands
2020-09-03 Feng Xue <fxue@os.amperecomputing.com>
gcc/
PR tree-optimization/94234
* genmatch.c (dt_simplify::gen_1): Emit check on final simplification
result when "!" is specified on toplevel output expr.
* match.pd ((A * C) +- (B * C) -> (A +- B) * C): Allow folding on expr
with multi-use operands if final result is a simple gimple value.
gcc/testsuite/
PR tree-optimization/94234
* gcc.dg/pr94234-2.c: New test.
Diff:
---
gcc/genmatch.c | 10 ++++++++--
gcc/match.pd | 22 +++++++++++++---------
gcc/testsuite/gcc.dg/pr94234-2.c | 39 +++++++++++++++++++++++++++++++++++++++
3 files changed, 60 insertions(+), 11 deletions(-)
diff --git a/gcc/genmatch.c b/gcc/genmatch.c
index 906d842c4d8..01363e3f09c 100644
--- a/gcc/genmatch.c
+++ b/gcc/genmatch.c
@@ -3426,8 +3426,14 @@ dt_simplify::gen_1 (FILE *f, int indent, bool gimple, operand *result)
/* Re-fold the toplevel result. It's basically an embedded
gimple_build w/o actually building the stmt. */
if (!is_predicate)
- fprintf_indent (f, indent,
- "res_op->resimplify (lseq, valueize);\n");
+ {
+ fprintf_indent (f, indent,
+ "res_op->resimplify (lseq, valueize);\n");
+ if (e->force_leaf)
+ fprintf_indent (f, indent,
+ "if (!maybe_push_res_to_seq (res_op, NULL)) "
+ "goto %s;\n", fail_label);
+ }
}
else if (result->type == operand::OP_CAPTURE
|| result->type == operand::OP_C_EXPR)
diff --git a/gcc/match.pd b/gcc/match.pd
index 6e45836e32b..46fd880bd37 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -2570,15 +2570,19 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(for plusminus (plus minus)
(simplify
(plusminus (mult:cs@3 @0 @1) (mult:cs@4 @0 @2))
- (if ((!ANY_INTEGRAL_TYPE_P (type)
- || TYPE_OVERFLOW_WRAPS (type)
- || (INTEGRAL_TYPE_P (type)
- && tree_expr_nonzero_p (@0)
- && expr_not_equal_to (@0, wi::minus_one (TYPE_PRECISION (type)))))
- /* If @1 +- @2 is constant require a hard single-use on either
- original operand (but not on both). */
- && (single_use (@3) || single_use (@4)))
- (mult (plusminus @1 @2) @0)))
+ (if (!ANY_INTEGRAL_TYPE_P (type)
+ || TYPE_OVERFLOW_WRAPS (type)
+ || (INTEGRAL_TYPE_P (type)
+ && tree_expr_nonzero_p (@0)
+ && expr_not_equal_to (@0, wi::minus_one (TYPE_PRECISION (type)))))
+ (if (single_use (@3) || single_use (@4))
+ /* If @1 +- @2 is constant require a hard single-use on either
+ original operand (but not on both). */
+ (mult (plusminus @1 @2) @0)
+#if GIMPLE
+ (mult! (plusminus @1 @2) @0)
+#endif
+ )))
/* We cannot generate constant 1 for fract. */
(if (!ALL_FRACT_MODE_P (TYPE_MODE (type)))
(simplify
diff --git a/gcc/testsuite/gcc.dg/pr94234-2.c b/gcc/testsuite/gcc.dg/pr94234-2.c
new file mode 100644
index 00000000000..1f4b194dd43
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr94234-2.c
@@ -0,0 +1,39 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-forwprop1" } */
+
+int use_fn (int a);
+
+int foo (int n)
+{
+ int b1 = 8 * (n + 1);
+ int b2 = 8 * n;
+
+ use_fn (b1 ^ b2);
+
+ return b1 - b2;
+}
+
+unsigned goo (unsigned m_param, unsigned n_param)
+{
+ unsigned b1 = m_param * (n_param + 2);
+ unsigned b2 = m_param * (n_param + 1);
+
+ use_fn (b1 ^ b2);
+
+ return b1 - b2;
+}
+
+unsigned hoo (unsigned k_param)
+{
+ unsigned b1 = k_param * 28;
+ unsigned b2 = k_param * 15;
+ unsigned b3 = k_param * 12;
+
+ use_fn (b1 ^ b2 ^ b3);
+
+ return (b1 - b2) - b3;
+}
+
+/* { dg-final { scan-tree-dump-times "return 8;" 1 "forwprop1" } } */
+/* { dg-final { scan-tree-dump-times "return m_param" 1 "forwprop1" } } */
+/* { dg-final { scan-tree-dump-not "return k_param" "forwprop1" } } */
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