https://gcc.gnu.org/g:9e971c671ded9647beb0a1c5b9430b4e64060862
commit r14-10255-g9e971c671ded9647beb0a1c5b9430b4e64060862
Author: Richard Biener <rguent...@suse.de>
Date: Mon May 6 12:03:09 2024 +0200
tree-optimization/114921 - _Float16 -> __bf16 isn't noop fixup
The following further strengthens the check which convert expressions
we allow to vectorize as simple copy by resorting to
tree_nop_conversion_p on the vector components.
PR tree-optimization/114921
* tree-vect-stmts.cc (vectorizable_assignment): Use
tree_nop_conversion_p to identify converts we can vectorize
with a simple assignment.
(cherry picked from commit d0d6dcc019cd32eebf85d625f56e0f7573938319)
Diff:
---
gcc/tree-vect-stmts.cc | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)
diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index f8d8636b139..21e8fe98e44 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -5955,14 +5955,17 @@ vectorizable_assignment (vec_info *vinfo,
if (!vectype_in)
vectype_in = get_vectype_for_scalar_type (vinfo, TREE_TYPE (op), slp_node);
- /* We can handle NOP_EXPR conversions that do not change the number
- of elements or the vector size. */
- if ((CONVERT_EXPR_CODE_P (code)
- || code == VIEW_CONVERT_EXPR)
- && (!vectype_in
- || maybe_ne (TYPE_VECTOR_SUBPARTS (vectype_in), nunits)
- || maybe_ne (GET_MODE_SIZE (TYPE_MODE (vectype)),
- GET_MODE_SIZE (TYPE_MODE (vectype_in)))))
+ /* We can handle VIEW_CONVERT conversions that do not change the number
+ of elements or the vector size or other conversions when the component
+ types are nop-convertible. */
+ if (!vectype_in
+ || maybe_ne (TYPE_VECTOR_SUBPARTS (vectype_in), nunits)
+ || (code == VIEW_CONVERT_EXPR
+ && maybe_ne (GET_MODE_SIZE (TYPE_MODE (vectype)),
+ GET_MODE_SIZE (TYPE_MODE (vectype_in))))
+ || (CONVERT_EXPR_CODE_P (code)
+ && !tree_nop_conversion_p (TREE_TYPE (vectype),
+ TREE_TYPE (vectype_in))))
return false;
if (VECTOR_BOOLEAN_TYPE_P (vectype) != VECTOR_BOOLEAN_TYPE_P (vectype_in))
