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From: "xiezhiheng at huawei dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94442] [10/11 regression] Redundant loads/stores emitted at -O3
Date: Mon, 29 Jun 2020 02:04:19 +0000 [thread overview]
Message-ID: <bug-94442-4-B3YoKhDcjy@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-94442-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94442
--- Comment #6 from xiezhiheng at huawei dot com ---
I'm trying to modify get_inner_reference to handle the case
for MEM[ptr, off].
I extract the "off" and add it to the recorded offset, then I
build a MEM[ptr, 0] and return it later.
Like this
}
exp = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
}
+ else if (TREE_CODE (TREE_OPERAND (exp, 0)) == SSA_NAME)
+ {
+ tree off = TREE_OPERAND (exp, 1);
+ if (!integer_zerop (off))
+ {
+ poly_offset_int boff = mem_ref_offset (exp);
+ boff <<= LOG2_BITS_PER_UNIT;
+ bit_offset += boff;
+
+ exp = build2 (MEM_REF, TREE_TYPE (exp),
+ TREE_OPERAND (exp, 0),
+ build_int_cst (TREE_TYPE (off), 0));
+ }
+ }
goto done;
default:
Assembly with the patch looks like:
.L6:
ldp q3, q2, [x0, 64]
add w2, w2, 1
sqadd v1.16b, v1.16b, v3.16b
sqadd v0.16b, v0.16b, v2.16b
sqadd v1.16b, v1.16b, v3.16b
sqadd v0.16b, v0.16b, v2.16b
sqadd v3.16b, v3.16b, v1.16b
sqadd v2.16b, v2.16b, v0.16b
sqadd v1.16b, v1.16b, v3.16b
sqadd v0.16b, v0.16b, v2.16b
sqadd v1.16b, v1.16b, v3.16b
sqadd v0.16b, v0.16b, v2.16b
sqadd v3.16b, v3.16b, v1.16b
sqadd v2.16b, v2.16b, v0.16b
sqadd v1.16b, v1.16b, v3.16b
sqadd v0.16b, v0.16b, v2.16b
sqadd v5.16b, v1.16b, v3.16b
sqadd v4.16b, v0.16b, v2.16b
stp q1, q0, [x0]
sqadd v3.16b, v3.16b, v5.16b
sqadd v2.16b, v2.16b, v4.16b
sqadd v1.16b, v1.16b, v3.16b
sqadd v0.16b, v0.16b, v2.16b
stp q3, q2, [x0, 64]
stp q1, q0, [x0, 32]
cmp w1, w2
bne .L6
next prev parent reply other threads:[~2020-06-29 2:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-01 12:57 [Bug rtl-optimization/94442] New: [AArch64] Redundant ldp/stp instructions " xiezhiheng at huawei dot com
2020-04-01 21:12 ` [Bug tree-optimization/94442] " pinskia at gcc dot gnu.org
2020-04-06 12:14 ` wdijkstr at arm dot com
2020-04-30 7:22 ` [Bug tree-optimization/94442] [10 regression] Redundant loads/stores " rguenth at gcc dot gnu.org
2020-05-06 8:00 ` [Bug tree-optimization/94442] [10/11 " xiezhiheng at huawei dot com
2020-05-07 11:56 ` jakub at gcc dot gnu.org
2020-06-29 2:04 ` xiezhiheng at huawei dot com [this message]
2020-07-23 6:52 ` rguenth at gcc dot gnu.org
2021-01-14 8:36 ` [Bug middle-end/94442] " rguenth at gcc dot gnu.org
2021-01-14 8:36 ` rguenth at gcc dot gnu.org
2021-02-25 14:36 ` jakub at gcc dot gnu.org
2021-02-27 8:46 ` xiezhiheng at huawei dot com
2021-04-08 12:02 ` rguenth at gcc dot gnu.org
2022-06-28 10:40 ` [Bug middle-end/94442] [10/11/12/13 " jakub at gcc dot gnu.org
2023-07-07 10:37 ` [Bug middle-end/94442] [11/12/13/14 " rguenth at gcc dot gnu.org
2023-08-04 17:21 ` pinskia at gcc dot gnu.org
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