public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r14-1014] Use BIT_FIELD_REF inside fold_single_bit_test
@ 2023-05-20 5:06 Andrew Pinski
0 siblings, 0 replies; only message in thread
From: Andrew Pinski @ 2023-05-20 5:06 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:c5df248509b489364c573e8b7f5f4c2fdb87f5b4
commit r14-1014-gc5df248509b489364c573e8b7f5f4c2fdb87f5b4
Author: Andrew Pinski <apinski@marvell.com>
Date: Fri May 19 19:44:35 2023 +0000
Use BIT_FIELD_REF inside fold_single_bit_test
Instead of depending on combine to do the extraction,
Let's create a tree which will expand directly into
the extraction. This improves code generation on some
targets.
gcc/ChangeLog:
* expr.cc (fold_single_bit_test): Use BIT_FIELD_REF
instead of shift/and.
Diff:
---
gcc/expr.cc | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)
diff --git a/gcc/expr.cc b/gcc/expr.cc
index b5bc3fabb7e..d04e8ed0204 100644
--- a/gcc/expr.cc
+++ b/gcc/expr.cc
@@ -12957,22 +12957,21 @@ fold_single_bit_test (location_t loc, enum tree_code code,
intermediate_type = ops_unsigned ? unsigned_type : signed_type;
inner = fold_convert_loc (loc, intermediate_type, inner);
- if (bitnum != 0)
- inner = build2 (RSHIFT_EXPR, intermediate_type,
- inner, size_int (bitnum));
+ tree bftype = build_nonstandard_integer_type (1, 1);
+ int bitpos = bitnum;
- one = build_int_cst (intermediate_type, 1);
+ if (BYTES_BIG_ENDIAN)
+ bitpos = GET_MODE_BITSIZE (operand_mode) - 1 - bitpos;
- if (code == EQ_EXPR)
- inner = fold_build2_loc (loc, BIT_XOR_EXPR, intermediate_type, inner, one);
+ inner = build3_loc (loc, BIT_FIELD_REF, bftype, inner,
+ bitsize_int (1), bitsize_int (bitpos));
- /* Put the AND last so it can combine with more things. */
- inner = build2 (BIT_AND_EXPR, intermediate_type, inner, one);
+ one = build_int_cst (bftype, 1);
- /* Make sure to return the proper type. */
- inner = fold_convert_loc (loc, result_type, inner);
+ if (code == EQ_EXPR)
+ inner = fold_build2_loc (loc, BIT_XOR_EXPR, bftype, inner, one);
- return inner;
+ return fold_convert_loc (loc, result_type, inner);
}
/* Generate code to calculate OPS, and exploded expression
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-05-20 5:06 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-05-20 5:06 [gcc r14-1014] Use BIT_FIELD_REF inside fold_single_bit_test Andrew Pinski
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).