Hey.
The patch is about VEC_COND_EXP comparison of a SSA_NAME with a constant
that is artifact of -fno-tree-ccp.
Patch can bootstrap on x86_64-linux-gnu and survives regression tests.
Ready to be installed?
Thanks,
Martin
gcc/ChangeLog:
PR tree-optimization/96466
* gimple-fold.c (expand_cmp_piecewise): New.
* gimple-fold.h (nunits_for_known_piecewise_op): New.
(expand_cmp_piecewise): Moved from ...
* tree-vect-generic.c (expand_vector_comparison): ... here.
(nunits_for_known_piecewise_op): Moved to gimple-fold.h.
* gimple-isel.cc (gimple_expand_vec_cond_expr): Use
expand_cmp_piecewise fallback for constants.
gcc/testsuite/ChangeLog:
PR tree-optimization/96466
* gcc.dg/vect/pr96466.c: New test.
---
gcc/gimple-fold.c | 28 ++++++++++++++++++++
gcc/gimple-fold.h | 14 ++++++++++
gcc/gimple-isel.cc | 10 ++++---
gcc/testsuite/gcc.dg/vect/pr96466.c | 18 +++++++++++++
gcc/tree-vect-generic.c | 41 ++---------------------------
5 files changed, 69 insertions(+), 42 deletions(-)
create mode 100644 gcc/testsuite/gcc.dg/vect/pr96466.c
diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c
index dcc1b56a273..86d5d0ed7d8 100644
--- a/gcc/gimple-fold.c
+++ b/gcc/gimple-fold.c
@@ -8056,3 +8056,31 @@ gimple_stmt_integer_valued_real_p (gimple *stmt, int
depth)
return false;
}
}
+
+tree
+expand_cmp_piecewise (gimple_stmt_iterator *gsi, tree type, tree op0, tree op1)
+{
+ tree inner_type = TREE_TYPE (TREE_TYPE (op0));
+ tree part_width = vector_element_bits_tree (TREE_TYPE (op0));
+ tree index = bitsize_int (0);
+ int nunits = nunits_for_known_piecewise_op (TREE_TYPE (op0));
+ int prec = GET_MODE_PRECISION (SCALAR_TYPE_MODE (type));
+ tree ret_type = build_nonstandard_integer_type (prec, 1);
+ tree ret_inner_type = boolean_type_node;
+ int i;
+ tree t = build_zero_cst (ret_type);
+
+ if (TYPE_PRECISION (ret_inner_type) != 1)
+ ret_inner_type = build_nonstandard_integer_type (1, 1);
+ for (i = 0; i < nunits;
+ i++, index = int_const_binop (PLUS_EXPR, index, part_width))
+ {
+ tree a = tree_vec_extract (gsi, inner_type, op0, part_width, index);
+ tree b = tree_vec_extract (gsi, inner_type, op1, part_width, index);
+ tree result = gimplify_build2 (gsi, NE_EXPR, ret_inner_type, a, b);
+ t = gimplify_build3 (gsi, BIT_INSERT_EXPR, ret_type, t, result,
+ bitsize_int (i));
+ }
+
+ return gimplify_build1 (gsi, VIEW_CONVERT_EXPR, type, t);
+}
diff --git a/gcc/gimple-fold.h b/gcc/gimple-fold.h
index 0ed1d1ffe83..7e843b34f53 100644
--- a/gcc/gimple-fold.h
+++ b/gcc/gimple-fold.h
@@ -147,6 +147,20 @@ gimple_build_vector (gimple_seq *seq, tree_vector_builder
*builder)
extern bool gimple_stmt_nonnegative_warnv_p (gimple *, bool *, int = 0);
extern bool gimple_stmt_integer_valued_real_p (gimple *, int = 0);
+/* Return the number of elements in a vector type TYPE that we have
+ already decided needs to be expanded piecewise. We don't support
+ this kind of expansion for variable-length vectors, since we should
+ always check for target support before introducing uses of those. */
+
+static inline unsigned int
+nunits_for_known_piecewise_op (const_tree type)
+{
+ return TYPE_VECTOR_SUBPARTS (type).to_constant ();
+}
+
+extern tree expand_cmp_piecewise (gimple_stmt_iterator *gsi, tree lhs,
+ tree op0, tree op1);
+
/* In gimple-match.c. */
extern tree gimple_simplify (enum tree_code, tree, tree,
gimple_seq *, tree (*)(tree));
diff --git a/gcc/gimple-isel.cc b/gcc/gimple-isel.cc
index b330cf4c20e..32e3bc31f7f 100644
--- a/gcc/gimple-isel.cc
+++ b/gcc/gimple-isel.cc
@@ -33,8 +33,8 @@ along with GCC; see the file COPYING3. If not see
#include "gimplify-me.h"
#include "gimplify.h"
#include "tree-cfg.h"
-#include "bitmap.h"
#include "tree-ssa-dce.h"
+#include "gimple-fold.h"
/* Expand all VEC_COND_EXPR gimple assignments into calls to internal
function based on type of selected expansion. */
@@ -119,8 +119,12 @@ gimple_expand_vec_cond_expr (gimple_stmt_iterator *gsi,
/* Fake op0 < 0. */
else
{
- gcc_assert (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (op0)))
- == MODE_VECTOR_INT);
+ if (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (op0))) != MODE_VECTOR_INT)
+ {
+ tree t = expand_cmp_piecewise (gsi, TREE_TYPE (lhs), op0, op1);
+ return gimple_build_assign (lhs, NOP_EXPR, t);
+ }
+
op0a = op0;
op0b = build_zero_cst (TREE_TYPE (op0));
tcode = LT_EXPR;
diff --git a/gcc/testsuite/gcc.dg/vect/pr96466.c
b/gcc/testsuite/gcc.dg/vect/pr96466.c
new file mode 100644
index 00000000000..8cca5e12ff2
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr96466.c
@@ -0,0 +1,18 @@
+/* PR tree-optimization/96466 */
+/* { dg-do compile } */
+/* { dg-options "-Og -finline-functions-called-once -fno-tree-ccp" } */
+
+typedef unsigned long __attribute__ ((__vector_size__ (8))) V;
+
+V
+bar (unsigned long x, V v)
+{
+ v &= x >= v;
+ return (V) v;
+}
+
+V
+foo (void)
+{
+ return bar (5, (V) 4441221375);
+}
diff --git a/gcc/tree-vect-generic.c b/gcc/tree-vect-generic.c
index 6d5d65195ae..b01aa301baa 100644
--- a/gcc/tree-vect-generic.c
+++ b/gcc/tree-vect-generic.c
@@ -42,20 +42,11 @@ along with GCC; see the file COPYING3. If not see
#include "insn-config.h"
#include "tree-ssa-dce.h"
#include "recog.h" /* FIXME: for insn_data */
+#include "gimple-fold.h"
static void expand_vector_operations_1 (gimple_stmt_iterator *, bitmap);
-/* Return the number of elements in a vector type TYPE that we have
- already decided needs to be expanded piecewise. We don't support
- this kind of expansion for variable-length vectors, since we should
- always check for target support before introducing uses of those. */
-static unsigned int
-nunits_for_known_piecewise_op (const_tree type)
-{
- return TYPE_VECTOR_SUBPARTS (type).to_constant ();
-}
-
/* Return true if TYPE1 has more elements than TYPE2, where either
type may be a vector or a scalar. */
@@ -427,35 +418,7 @@ expand_vector_comparison (gimple_stmt_iterator *gsi, tree type, tree op0,
TYPE_VECTOR_SUBPARTS (type)
* GET_MODE_BITSIZE (SCALAR_TYPE_MODE
(TREE_TYPE (type)))))
- {
- tree inner_type = TREE_TYPE (TREE_TYPE (op0));
- tree part_width = vector_element_bits_tree (TREE_TYPE (op0));
- tree index = bitsize_int (0);
- int nunits = nunits_for_known_piecewise_op (TREE_TYPE (op0));
- int prec = GET_MODE_PRECISION (SCALAR_TYPE_MODE (type));
- tree ret_type = build_nonstandard_integer_type (prec, 1);
- tree ret_inner_type = boolean_type_node;
- int i;
- location_t loc = gimple_location (gsi_stmt (*gsi));
- t = build_zero_cst (ret_type);
-
- if (TYPE_PRECISION (ret_inner_type) != 1)
- ret_inner_type = build_nonstandard_integer_type (1, 1);
- warning_at (loc, OPT_Wvector_operation_performance,
- "vector operation will be expanded piecewise");
- for (i = 0; i < nunits;
- i++, index = int_const_binop (PLUS_EXPR, index, part_width))
- {
- tree a = tree_vec_extract (gsi, inner_type, op0, part_width,
- index);
- tree b = tree_vec_extract (gsi, inner_type, op1, part_width,
- index);
- tree result = gimplify_build2 (gsi, code, ret_inner_type, a, b);
- t = gimplify_build3 (gsi, BIT_INSERT_EXPR, ret_type, t, result,
- bitsize_int (i));
- }
- t = gimplify_build1 (gsi, VIEW_CONVERT_EXPR, type, t);
- }
+ t = expand_cmp_piecewise (gsi, type, op0, op1);
else
t = expand_vector_piecewise (gsi, do_compare, type,
TREE_TYPE (TREE_TYPE (op0)), op0, op1,
--
2.28.0
