[llvm] [AArch64][NeoverseV1] Load pair immed offset LDPXi, LDNPXi, LDPX<pre|… (PR #221718)
Julien Villette via llvm-commits
llvm-commits at lists.llvm.org
Fri Sep 11 12:46:26 PDT 2026
https://github.com/jvillette38 updated https://github.com/llvm/llvm-project/pull/221718
>From 5d40e30f5c0f90f4423e02d84772e1ff2aec700a Mon Sep 17 00:00:00 2001
From: Julien Villette <julien.villette at sipearl.com>
Date: Tue, 1 Sep 2026 15:04:57 +0200
Subject: [PATCH 1/2] [AArch64][NeoverseV1] Load pair immed offset LDPXi,
LDNPXi, LDPX<pre|post>, LDPSWi, LDPSW<pre|post>
Verified with dedicated micro benchmarks on Neoverse V1 hardware.
Instruction | uop/Latency/RThroughput
--------------------------------------------------------
ldp (X-form, offset) | 3/4/1.00
ldpsw (offset) | 3/5/0.50
ldp (X-form, pre-post) | 4/4/1.00
ldpsw (pre-post) | 4/5/0.75
ld[n]p X form has the same throughput as 3 ldr X on Neoverse V1, so
consider L[3] resources for these instructions: throughput 3/3.
ld[n]p X form post pre index: L[3] + I[1]: throughput 3/3.
ldpsw has approximatively the throughput of ld[n]p w-form (L[1]) + 2 sxtw (I[2]): throughput 4/2
ldpsw (post/pre index): add on I uop: L[1] + I[3]: throughput 4/3
---
.../Target/AArch64/AArch64SchedNeoverseV1.td | 13 ++-
.../AArch64/Neoverse/V1-basic-instructions.s | 86 +++++++++----------
.../llvm-mca/AArch64/Neoverse/V1-writeback.s | 24 +++---
3 files changed, 64 insertions(+), 59 deletions(-)
diff --git a/llvm/lib/Target/AArch64/AArch64SchedNeoverseV1.td b/llvm/lib/Target/AArch64/AArch64SchedNeoverseV1.td
index b8bab7ece3a2b..6a88b586bbd75 100644
--- a/llvm/lib/Target/AArch64/AArch64SchedNeoverseV1.td
+++ b/llvm/lib/Target/AArch64/AArch64SchedNeoverseV1.td
@@ -172,8 +172,6 @@ let Latency = 6, NumMicroOps = 2 in
def V1Write_6c_1B_1M0 : SchedWriteRes<[V1UnitB, V1UnitM0]>;
let Latency = 3, NumMicroOps = 2 in
def V1Write_3c_1I_1M : SchedWriteRes<[V1UnitI, V1UnitM]>;
-let Latency = 5, NumMicroOps = 2 in
-def V1Write_5c_1I_1L : SchedWriteRes<[V1UnitI, V1UnitL]>;
let Latency = 7, NumMicroOps = 2 in
def V1Write_7c_1I_1L : SchedWriteRes<[V1UnitI, V1UnitL]>;
let Latency = 6, NumMicroOps = 2 in
@@ -250,8 +248,12 @@ let Latency = 7, NumMicroOps = 3 in
def V1Write_7c_2M0_1V01 : SchedWriteRes<[V1UnitM0, V1UnitM0, V1UnitV01]>;
let Latency = 8, NumMicroOps = 3 in
def V1Write_8c_1L_2V : SchedWriteRes<[V1UnitL, V1UnitV, V1UnitV]>;
+let Latency = 4, NumMicroOps = 3 in
+def V1Write_4c_3L : SchedWriteRes<[V1UnitL, V1UnitL, V1UnitL]>;
let Latency = 6, NumMicroOps = 3 in
def V1Write_6c_3L : SchedWriteRes<[V1UnitL, V1UnitL, V1UnitL]>;
+let Latency = 5, NumMicroOps = 3 in
+def V1Write_5c_2I_1L : SchedWriteRes<[V1UnitI, V1UnitI, V1UnitL]>;
let Latency = 2, NumMicroOps = 3 in
def V1Write_2c_1L01_1S_1V : SchedWriteRes<[V1UnitL01, V1UnitS, V1UnitV]>;
let Latency = 4, NumMicroOps = 3 in
@@ -725,14 +727,17 @@ def : SchedAlias<WriteAdr, V1Write_1c_1I>;
// Load pair, immed offset
def : SchedAlias<WriteLDHi, V1Write_4c_1L>;
def : InstRW<[V1Write_4c_1L, V1Write_0c_0Z], (instrs LDPWi, LDNPWi)>;
+def : InstRW<[V1Write_4c_3L, V1Write_0c_0Z], (instrs LDPXi, LDNPXi)>;
def : InstRW<[WriteAdr, V1Write_4c_1L, V1Write_0c_0Z],
(instrs LDPWpost, LDPWpre)>;
+def : InstRW<[WriteAdr, V1Write_4c_3L, V1Write_0c_0Z],
+ (instrs LDPXpost, LDPXpre)>;
// Load pair, signed immed offset, signed words
-def : InstRW<[V1Write_5c_1I_1L, V1Write_0c_0Z], (instrs LDPSWi)>;
+def : InstRW<[V1Write_5c_2I_1L, V1Write_0c_0Z], (instrs LDPSWi)>;
// Load pair, immed post or pre-index, signed words
-def : InstRW<[WriteAdr, V1Write_5c_1I_1L, V1Write_0c_0Z],
+def : InstRW<[WriteAdr, V1Write_5c_2I_1L, V1Write_0c_0Z],
(instrs LDPSWpost, LDPSWpre)>;
diff --git a/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-basic-instructions.s b/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-basic-instructions.s
index da6a36c654ee8..49c4d529ed9b9 100644
--- a/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-basic-instructions.s
+++ b/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-basic-instructions.s
@@ -1107,12 +1107,12 @@
# CHECK-NEXT: 2 1 0.50 * stp wzr, w9, [sp, #252]
# CHECK-NEXT: 1 4 0.33 * ldp w2, wzr, [sp, #-256]
# CHECK-NEXT: 1 4 0.33 * ldp w9, w10, [sp, #4]
-# CHECK-NEXT: 2 5 0.33 * ldpsw x9, x10, [sp, #4]
-# CHECK-NEXT: 2 5 0.33 * ldpsw x9, x10, [x2, #-256]
-# CHECK-NEXT: 2 5 0.33 * ldpsw x20, x30, [sp, #252]
-# CHECK-NEXT: 2 4 0.67 * ldp x21, x29, [x2, #504]
-# CHECK-NEXT: 2 4 0.67 * ldp x22, x23, [x3, #-512]
-# CHECK-NEXT: 2 4 0.67 * ldp x24, x25, [x4, #8]
+# CHECK-NEXT: 3 5 0.50 * ldpsw x9, x10, [sp, #4]
+# CHECK-NEXT: 3 5 0.50 * ldpsw x9, x10, [x2, #-256]
+# CHECK-NEXT: 3 5 0.50 * ldpsw x20, x30, [sp, #252]
+# CHECK-NEXT: 3 4 1.00 * ldp x21, x29, [x2, #504]
+# CHECK-NEXT: 3 4 1.00 * ldp x22, x23, [x3, #-512]
+# CHECK-NEXT: 3 4 1.00 * ldp x24, x25, [x4, #8]
# CHECK-NEXT: 1 6 0.33 * ldp s29, s28, [sp, #252]
# CHECK-NEXT: 2 2 0.50 * stp s27, s26, [sp, #-256]
# CHECK-NEXT: 1 6 0.33 * ldp s1, s2, [x3, #44]
@@ -1128,12 +1128,12 @@
# CHECK-NEXT: 3 1 0.50 * stp wzr, w9, [sp], #252
# CHECK-NEXT: 2 4 0.33 * ldp w2, wzr, [sp], #-256
# CHECK-NEXT: 2 4 0.33 * ldp w9, w10, [sp], #4
-# CHECK-NEXT: 3 5 0.50 * ldpsw x9, x10, [sp], #4
-# CHECK-NEXT: 3 5 0.50 * ldpsw x9, x10, [x2], #-256
-# CHECK-NEXT: 3 5 0.50 * ldpsw x20, x30, [sp], #252
-# CHECK-NEXT: 3 4 0.67 * ldp x21, x29, [x2], #504
-# CHECK-NEXT: 3 4 0.67 * ldp x22, x23, [x3], #-512
-# CHECK-NEXT: 3 4 0.67 * ldp x24, x25, [x4], #8
+# CHECK-NEXT: 4 5 0.75 * ldpsw x9, x10, [sp], #4
+# CHECK-NEXT: 4 5 0.75 * ldpsw x9, x10, [x2], #-256
+# CHECK-NEXT: 4 5 0.75 * ldpsw x20, x30, [sp], #252
+# CHECK-NEXT: 4 4 1.00 * ldp x21, x29, [x2], #504
+# CHECK-NEXT: 4 4 1.00 * ldp x22, x23, [x3], #-512
+# CHECK-NEXT: 4 4 1.00 * ldp x24, x25, [x4], #8
# CHECK-NEXT: 2 6 0.33 * ldp s29, s28, [sp], #252
# CHECK-NEXT: 3 2 0.50 * stp s27, s26, [sp], #-256
# CHECK-NEXT: 2 6 0.33 * ldp s1, s2, [x3], #44
@@ -1147,12 +1147,12 @@
# CHECK-NEXT: 3 1 0.50 * stp wzr, w9, [sp, #252]!
# CHECK-NEXT: 2 4 0.33 * ldp w2, wzr, [sp, #-256]!
# CHECK-NEXT: 2 4 0.33 * ldp w9, w10, [sp, #4]!
-# CHECK-NEXT: 3 5 0.50 * ldpsw x9, x10, [sp, #4]!
-# CHECK-NEXT: 3 5 0.50 * ldpsw x9, x10, [x2, #-256]!
-# CHECK-NEXT: 3 5 0.50 * ldpsw x20, x30, [sp, #252]!
-# CHECK-NEXT: 3 4 0.67 * ldp x21, x29, [x2, #504]!
-# CHECK-NEXT: 3 4 0.67 * ldp x22, x23, [x3, #-512]!
-# CHECK-NEXT: 3 4 0.67 * ldp x24, x25, [x4, #8]!
+# CHECK-NEXT: 4 5 0.75 * ldpsw x9, x10, [sp, #4]!
+# CHECK-NEXT: 4 5 0.75 * ldpsw x9, x10, [x2, #-256]!
+# CHECK-NEXT: 4 5 0.75 * ldpsw x20, x30, [sp, #252]!
+# CHECK-NEXT: 4 4 1.00 * ldp x21, x29, [x2, #504]!
+# CHECK-NEXT: 4 4 1.00 * ldp x22, x23, [x3, #-512]!
+# CHECK-NEXT: 4 4 1.00 * ldp x24, x25, [x4, #8]!
# CHECK-NEXT: 2 6 0.33 * ldp s29, s28, [sp, #252]!
# CHECK-NEXT: 3 2 0.50 * stp s27, s26, [sp, #-256]!
# CHECK-NEXT: 2 6 0.33 * ldp s1, s2, [x3, #44]!
@@ -1166,9 +1166,9 @@
# CHECK-NEXT: 2 1 0.50 * stnp wzr, w9, [sp, #252]
# CHECK-NEXT: 1 4 0.33 * ldnp w2, wzr, [sp, #-256]
# CHECK-NEXT: 1 4 0.33 * ldnp w9, w10, [sp, #4]
-# CHECK-NEXT: 2 4 0.67 * ldnp x21, x29, [x2, #504]
-# CHECK-NEXT: 2 4 0.67 * ldnp x22, x23, [x3, #-512]
-# CHECK-NEXT: 2 4 0.67 * ldnp x24, x25, [x4, #8]
+# CHECK-NEXT: 3 4 1.00 * ldnp x21, x29, [x2, #504]
+# CHECK-NEXT: 3 4 1.00 * ldnp x22, x23, [x3, #-512]
+# CHECK-NEXT: 3 4 1.00 * ldnp x24, x25, [x4, #8]
# CHECK-NEXT: 1 6 0.33 * ldnp s29, s28, [sp, #252]
# CHECK-NEXT: 2 2 0.50 * stnp s27, s26, [sp, #-256]
# CHECK-NEXT: 1 6 0.33 * ldnp s1, s2, [x3, #44]
@@ -1273,7 +1273,7 @@
# CHECK: Resource pressure per iteration:
# CHECK-NEXT: [0.0] [0.1] [1.0] [1.1] [2.0] [2.1] [2.2] [3] [4.0] [4.1] [5] [6] [7.0] [7.1] [8] [9] [10] [11]
-# CHECK-NEXT: 13.00 13.00 34.00 34.00 48.00 48.00 48.00 98.67 171.67 171.67 323.50 210.50 143.00 143.00 190.00 56.50 65.50 13.00
+# CHECK-NEXT: 13.00 13.00 34.00 34.00 48.00 48.00 48.00 102.67 175.67 175.67 325.75 212.75 145.25 145.25 190.00 56.50 65.50 13.00
# CHECK: Resource pressure by instruction:
# CHECK-NEXT: [0.0] [0.1] [1.0] [1.1] [2.0] [2.1] [2.2] [3] [4.0] [4.1] [5] [6] [7.0] [7.1] [8] [9] [10] [11] Instructions:
@@ -2374,12 +2374,12 @@
# CHECK-NEXT: - - 0.50 0.50 - - - - 0.50 0.50 - - - - - - - - stp wzr, w9, [sp, #252]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldp w2, wzr, [sp, #-256]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldp w9, w10, [sp, #4]
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldpsw x9, x10, [sp, #4]
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldpsw x9, x10, [x2, #-256]
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldpsw x20, x30, [sp, #252]
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 - - - - - - - - ldp x21, x29, [x2, #504]
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 - - - - - - - - ldp x22, x23, [x3, #-512]
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 - - - - - - - - ldp x24, x25, [x4, #8]
+# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [sp, #4]
+# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [x2, #-256]
+# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x20, x30, [sp, #252]
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 - - - - - - - - ldp x21, x29, [x2, #504]
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 - - - - - - - - ldp x22, x23, [x3, #-512]
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 - - - - - - - - ldp x24, x25, [x4, #8]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldp s29, s28, [sp, #252]
# CHECK-NEXT: - - - - - - - - 0.50 0.50 - - - - 0.50 0.50 - - stp s27, s26, [sp, #-256]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldp s1, s2, [x3, #44]
@@ -2395,12 +2395,12 @@
# CHECK-NEXT: - - 0.50 0.50 - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - stp wzr, w9, [sp], #252
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w2, wzr, [sp], #-256
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w9, w10, [sp], #4
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [sp], #4
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [x2], #-256
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x20, x30, [sp], #252
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldp x21, x29, [x2], #504
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldp x22, x23, [x3], #-512
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldp x24, x25, [x4], #8
+# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x9, x10, [sp], #4
+# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x9, x10, [x2], #-256
+# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x20, x30, [sp], #252
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x21, x29, [x2], #504
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x22, x23, [x3], #-512
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x24, x25, [x4], #8
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp s29, s28, [sp], #252
# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 0.50 0.50 - - stp s27, s26, [sp], #-256
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp s1, s2, [x3], #44
@@ -2414,12 +2414,12 @@
# CHECK-NEXT: - - 0.50 0.50 - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - stp wzr, w9, [sp, #252]!
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w2, wzr, [sp, #-256]!
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w9, w10, [sp, #4]!
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [sp, #4]!
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [x2, #-256]!
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x20, x30, [sp, #252]!
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldp x21, x29, [x2, #504]!
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldp x22, x23, [x3, #-512]!
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldp x24, x25, [x4, #8]!
+# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x9, x10, [sp, #4]!
+# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x9, x10, [x2, #-256]!
+# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x20, x30, [sp, #252]!
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x21, x29, [x2, #504]!
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x22, x23, [x3, #-512]!
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x24, x25, [x4, #8]!
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp s29, s28, [sp, #252]!
# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 0.50 0.50 - - stp s27, s26, [sp, #-256]!
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp s1, s2, [x3, #44]!
@@ -2433,9 +2433,9 @@
# CHECK-NEXT: - - 0.50 0.50 - - - - 0.50 0.50 - - - - - - - - stnp wzr, w9, [sp, #252]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldnp w2, wzr, [sp, #-256]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldnp w9, w10, [sp, #4]
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 - - - - - - - - ldnp x21, x29, [x2, #504]
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 - - - - - - - - ldnp x22, x23, [x3, #-512]
-# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 - - - - - - - - ldnp x24, x25, [x4, #8]
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 - - - - - - - - ldnp x21, x29, [x2, #504]
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 - - - - - - - - ldnp x22, x23, [x3, #-512]
+# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 - - - - - - - - ldnp x24, x25, [x4, #8]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldnp s29, s28, [sp, #252]
# CHECK-NEXT: - - - - - - - - 0.50 0.50 - - - - 0.50 0.50 - - stnp s27, s26, [sp, #-256]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldnp s1, s2, [x3, #44]
diff --git a/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-writeback.s b/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-writeback.s
index 6c182e00e6d0d..d325e8719ce7e 100644
--- a/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-writeback.s
+++ b/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-writeback.s
@@ -3233,12 +3233,12 @@ add x0, x27, 1
# CHECK: Iterations: 100
# CHECK-NEXT: Instructions: 1000
# CHECK-NEXT: Total Cycles: 507
-# CHECK-NEXT: Total uOps: 1900
+# CHECK-NEXT: Total uOps: 2300
# CHECK: Dispatch Width: 8
-# CHECK-NEXT: uOps Per Cycle: 3.75
+# CHECK-NEXT: uOps Per Cycle: 4.54
# CHECK-NEXT: IPC: 1.97
-# CHECK-NEXT: Block RThroughput: 3.0
+# CHECK-NEXT: Block RThroughput: 3.5
# CHECK: Timeline view:
# CHECK-NEXT: 01
@@ -3250,10 +3250,10 @@ add x0, x27, 1
# CHECK-NEXT: [0,3] D==eE--R .. add x0, x27, #1
# CHECK-NEXT: [0,4] .D=eeeeER .. ldp x1, x2, [x27, #496]!
# CHECK-NEXT: [0,5] .D==eE--R .. add x0, x27, #1
-# CHECK-NEXT: [0,6] .D==eeeeeER. ldpsw x1, x2, [x27], #248
-# CHECK-NEXT: [0,7] .D===eE---R. add x0, x27, #1
-# CHECK-NEXT: [0,8] . D==eeeeeER ldpsw x1, x2, [x27, #248]!
-# CHECK-NEXT: [0,9] . D===eE---R add x0, x27, #1
+# CHECK-NEXT: [0,6] . D=eeeeeER. ldpsw x1, x2, [x27], #248
+# CHECK-NEXT: [0,7] . D==eE---R. add x0, x27, #1
+# CHECK-NEXT: [0,8] . D=eeeeeER ldpsw x1, x2, [x27, #248]!
+# CHECK-NEXT: [0,9] . D==eE---R add x0, x27, #1
# CHECK: Average Wait times (based on the timeline view):
# CHECK-NEXT: [0]: Executions
@@ -3268,11 +3268,11 @@ add x0, x27, 1
# CHECK-NEXT: 3. 1 3.0 0.0 2.0 add x0, x27, #1
# CHECK-NEXT: 4. 1 2.0 0.0 0.0 ldp x1, x2, [x27, #496]!
# CHECK-NEXT: 5. 1 3.0 0.0 2.0 add x0, x27, #1
-# CHECK-NEXT: 6. 1 3.0 0.0 0.0 ldpsw x1, x2, [x27], #248
-# CHECK-NEXT: 7. 1 4.0 0.0 3.0 add x0, x27, #1
-# CHECK-NEXT: 8. 1 3.0 0.0 0.0 ldpsw x1, x2, [x27, #248]!
-# CHECK-NEXT: 9. 1 4.0 0.0 3.0 add x0, x27, #1
-# CHECK-NEXT: 10 2.7 0.1 1.2 <total>
+# CHECK-NEXT: 6. 1 2.0 0.0 0.0 ldpsw x1, x2, [x27], #248
+# CHECK-NEXT: 7. 1 3.0 0.0 3.0 add x0, x27, #1
+# CHECK-NEXT: 8. 1 2.0 0.0 0.0 ldpsw x1, x2, [x27, #248]!
+# CHECK-NEXT: 9. 1 3.0 0.0 3.0 add x0, x27, #1
+# CHECK-NEXT: 10 2.3 0.1 1.2 <total>
# CHECK: [46] Code Region - G47
>From b90dfb1f043a6d4ad1ebb2b913abe13b509df815 Mon Sep 17 00:00:00 2001
From: Julien Villette <julien.villette at sipearl.com>
Date: Fri, 11 Sep 2026 15:11:05 +0200
Subject: [PATCH 2/2] [AArch64][NeoverseV1] Fix Load Pair throughput and
micro-op counts
Measured on Neoverse V1 hardware with unrolled loops of independent
instances, using perf inst_spec/op_spec counters to get the real
micro-op counts.
Instruction | uops | RThroughput | was
----------------------------------------------------
ldp (X-form, offset) | 1 | 1.00 | 3 uops
ldp (W-form, offset) | 1 | 0.33 | unchanged
ldpsw (offset) | 3 | 0.67 | 0.50
ldp (X-form, pre/post)| 2 | 1.00 | 4 uops
ldp (W-form, pre/post)| 2 | 0.50 | 0.33
ldpsw (pre/post) | 4 | 1.00 | 0.75
LD[N]P X-form occupies three load slots but issues as a single
micro-op, so its SchedWriteRes no longer sets NumMicroOps = 3.
Modelling writeback forms on V1UnitL01 matches the measured
throughput and micro-op counts.
---
.../Target/AArch64/AArch64SchedNeoverseV1.td | 18 ++--
.../AArch64/Neoverse/V1-basic-instructions.s | 98 +++++++++----------
.../llvm-mca/AArch64/Neoverse/V1-writeback.s | 28 +++---
3 files changed, 74 insertions(+), 70 deletions(-)
diff --git a/llvm/lib/Target/AArch64/AArch64SchedNeoverseV1.td b/llvm/lib/Target/AArch64/AArch64SchedNeoverseV1.td
index 6a88b586bbd75..87416a27f79d8 100644
--- a/llvm/lib/Target/AArch64/AArch64SchedNeoverseV1.td
+++ b/llvm/lib/Target/AArch64/AArch64SchedNeoverseV1.td
@@ -104,8 +104,10 @@ def V1Write_1c_1I : SchedWriteRes<[V1UnitI]> { let Latency = 1; }
def V1Write_1c_1I_1Flg : SchedWriteRes<[V1UnitI, V1UnitFlg]> { let Latency = 1; }
def V1Write_4c_1L : SchedWriteRes<[V1UnitL]> { let Latency = 4; }
def V1Write_6c_1L : SchedWriteRes<[V1UnitL]> { let Latency = 6; }
+def V1Write_4c_3L : SchedWriteRes<[V1UnitL, V1UnitL, V1UnitL]> { let Latency = 4; }
def V1Write_1c_1L01 : SchedWriteRes<[V1UnitL01]> { let Latency = 1; }
def V1Write_4c_1L01 : SchedWriteRes<[V1UnitL01]> { let Latency = 4; }
+def V1Write_4c_2L01 : SchedWriteRes<[V1UnitL01,V1UnitL01]> { let Latency = 4; }
def V1Write_6c_1L01 : SchedWriteRes<[V1UnitL01]> { let Latency = 6; }
def V1Write_2c_1M : SchedWriteRes<[V1UnitM]> { let Latency = 2; }
def V1Write_2c_1M_1Flg : SchedWriteRes<[V1UnitM, V1UnitFlg]> { let Latency = 2; }
@@ -248,12 +250,14 @@ let Latency = 7, NumMicroOps = 3 in
def V1Write_7c_2M0_1V01 : SchedWriteRes<[V1UnitM0, V1UnitM0, V1UnitV01]>;
let Latency = 8, NumMicroOps = 3 in
def V1Write_8c_1L_2V : SchedWriteRes<[V1UnitL, V1UnitV, V1UnitV]>;
-let Latency = 4, NumMicroOps = 3 in
-def V1Write_4c_3L : SchedWriteRes<[V1UnitL, V1UnitL, V1UnitL]>;
let Latency = 6, NumMicroOps = 3 in
def V1Write_6c_3L : SchedWriteRes<[V1UnitL, V1UnitL, V1UnitL]>;
let Latency = 5, NumMicroOps = 3 in
-def V1Write_5c_2I_1L : SchedWriteRes<[V1UnitI, V1UnitI, V1UnitL]>;
+def V1Write_5c_1I_2L : SchedWriteRes<[V1UnitI, V1UnitL, V1UnitL]>;
+let Latency = 5, NumMicroOps = 3 in
+def V1Write_5c_1I_2L01 : SchedWriteRes<[V1UnitI, V1UnitL01, V1UnitL01]>;
+let Latency = 1, NumMicroOps = 3 in
+def V1Write_1c_1I_1L01_1D: SchedWriteRes<[V1UnitI, V1UnitL01, V1UnitD]>;
let Latency = 2, NumMicroOps = 3 in
def V1Write_2c_1L01_1S_1V : SchedWriteRes<[V1UnitL01, V1UnitS, V1UnitV]>;
let Latency = 4, NumMicroOps = 3 in
@@ -728,16 +732,16 @@ def : SchedAlias<WriteAdr, V1Write_1c_1I>;
def : SchedAlias<WriteLDHi, V1Write_4c_1L>;
def : InstRW<[V1Write_4c_1L, V1Write_0c_0Z], (instrs LDPWi, LDNPWi)>;
def : InstRW<[V1Write_4c_3L, V1Write_0c_0Z], (instrs LDPXi, LDNPXi)>;
-def : InstRW<[WriteAdr, V1Write_4c_1L, V1Write_0c_0Z],
+def : InstRW<[WriteAdr, V1Write_4c_1L01, V1Write_0c_0Z],
(instrs LDPWpost, LDPWpre)>;
-def : InstRW<[WriteAdr, V1Write_4c_3L, V1Write_0c_0Z],
+def : InstRW<[WriteAdr, V1Write_4c_2L01, V1Write_0c_0Z],
(instrs LDPXpost, LDPXpre)>;
// Load pair, signed immed offset, signed words
-def : InstRW<[V1Write_5c_2I_1L, V1Write_0c_0Z], (instrs LDPSWi)>;
+def : InstRW<[V1Write_5c_1I_2L, V1Write_0c_0Z], (instrs LDPSWi)>;
// Load pair, immed post or pre-index, signed words
-def : InstRW<[WriteAdr, V1Write_5c_2I_1L, V1Write_0c_0Z],
+def : InstRW<[WriteAdr, V1Write_5c_1I_2L01, V1Write_0c_0Z],
(instrs LDPSWpost, LDPSWpre)>;
diff --git a/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-basic-instructions.s b/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-basic-instructions.s
index 49c4d529ed9b9..6b29cd8900600 100644
--- a/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-basic-instructions.s
+++ b/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-basic-instructions.s
@@ -1107,12 +1107,12 @@
# CHECK-NEXT: 2 1 0.50 * stp wzr, w9, [sp, #252]
# CHECK-NEXT: 1 4 0.33 * ldp w2, wzr, [sp, #-256]
# CHECK-NEXT: 1 4 0.33 * ldp w9, w10, [sp, #4]
-# CHECK-NEXT: 3 5 0.50 * ldpsw x9, x10, [sp, #4]
-# CHECK-NEXT: 3 5 0.50 * ldpsw x9, x10, [x2, #-256]
-# CHECK-NEXT: 3 5 0.50 * ldpsw x20, x30, [sp, #252]
-# CHECK-NEXT: 3 4 1.00 * ldp x21, x29, [x2, #504]
-# CHECK-NEXT: 3 4 1.00 * ldp x22, x23, [x3, #-512]
-# CHECK-NEXT: 3 4 1.00 * ldp x24, x25, [x4, #8]
+# CHECK-NEXT: 3 5 0.67 * ldpsw x9, x10, [sp, #4]
+# CHECK-NEXT: 3 5 0.67 * ldpsw x9, x10, [x2, #-256]
+# CHECK-NEXT: 3 5 0.67 * ldpsw x20, x30, [sp, #252]
+# CHECK-NEXT: 1 4 1.00 * ldp x21, x29, [x2, #504]
+# CHECK-NEXT: 1 4 1.00 * ldp x22, x23, [x3, #-512]
+# CHECK-NEXT: 1 4 1.00 * ldp x24, x25, [x4, #8]
# CHECK-NEXT: 1 6 0.33 * ldp s29, s28, [sp, #252]
# CHECK-NEXT: 2 2 0.50 * stp s27, s26, [sp, #-256]
# CHECK-NEXT: 1 6 0.33 * ldp s1, s2, [x3, #44]
@@ -1124,16 +1124,16 @@
# CHECK-NEXT: 2 2 0.50 * stp q3, q5, [sp]
# CHECK-NEXT: 2 2 0.50 * stp q17, q19, [sp, #1008]
# CHECK-NEXT: 2 6 0.67 * ldp q23, q29, [x1, #-1024]
-# CHECK-NEXT: 2 4 0.33 * ldp w3, w5, [sp], #0
+# CHECK-NEXT: 2 4 0.50 * ldp w3, w5, [sp], #0
# CHECK-NEXT: 3 1 0.50 * stp wzr, w9, [sp], #252
-# CHECK-NEXT: 2 4 0.33 * ldp w2, wzr, [sp], #-256
-# CHECK-NEXT: 2 4 0.33 * ldp w9, w10, [sp], #4
-# CHECK-NEXT: 4 5 0.75 * ldpsw x9, x10, [sp], #4
-# CHECK-NEXT: 4 5 0.75 * ldpsw x9, x10, [x2], #-256
-# CHECK-NEXT: 4 5 0.75 * ldpsw x20, x30, [sp], #252
-# CHECK-NEXT: 4 4 1.00 * ldp x21, x29, [x2], #504
-# CHECK-NEXT: 4 4 1.00 * ldp x22, x23, [x3], #-512
-# CHECK-NEXT: 4 4 1.00 * ldp x24, x25, [x4], #8
+# CHECK-NEXT: 2 4 0.50 * ldp w2, wzr, [sp], #-256
+# CHECK-NEXT: 2 4 0.50 * ldp w9, w10, [sp], #4
+# CHECK-NEXT: 4 5 1.00 * ldpsw x9, x10, [sp], #4
+# CHECK-NEXT: 4 5 1.00 * ldpsw x9, x10, [x2], #-256
+# CHECK-NEXT: 4 5 1.00 * ldpsw x20, x30, [sp], #252
+# CHECK-NEXT: 2 4 1.00 * ldp x21, x29, [x2], #504
+# CHECK-NEXT: 2 4 1.00 * ldp x22, x23, [x3], #-512
+# CHECK-NEXT: 2 4 1.00 * ldp x24, x25, [x4], #8
# CHECK-NEXT: 2 6 0.33 * ldp s29, s28, [sp], #252
# CHECK-NEXT: 3 2 0.50 * stp s27, s26, [sp], #-256
# CHECK-NEXT: 2 6 0.33 * ldp s1, s2, [x3], #44
@@ -1143,16 +1143,16 @@
# CHECK-NEXT: 4 2 1.00 * stp q3, q5, [sp], #0
# CHECK-NEXT: 4 2 1.00 * stp q17, q19, [sp], #1008
# CHECK-NEXT: 3 6 0.67 * ldp q23, q29, [x1], #-1024
-# CHECK-NEXT: 2 4 0.33 * ldp w3, w5, [sp, #0]!
+# CHECK-NEXT: 2 4 0.50 * ldp w3, w5, [sp, #0]!
# CHECK-NEXT: 3 1 0.50 * stp wzr, w9, [sp, #252]!
-# CHECK-NEXT: 2 4 0.33 * ldp w2, wzr, [sp, #-256]!
-# CHECK-NEXT: 2 4 0.33 * ldp w9, w10, [sp, #4]!
-# CHECK-NEXT: 4 5 0.75 * ldpsw x9, x10, [sp, #4]!
-# CHECK-NEXT: 4 5 0.75 * ldpsw x9, x10, [x2, #-256]!
-# CHECK-NEXT: 4 5 0.75 * ldpsw x20, x30, [sp, #252]!
-# CHECK-NEXT: 4 4 1.00 * ldp x21, x29, [x2, #504]!
-# CHECK-NEXT: 4 4 1.00 * ldp x22, x23, [x3, #-512]!
-# CHECK-NEXT: 4 4 1.00 * ldp x24, x25, [x4, #8]!
+# CHECK-NEXT: 2 4 0.50 * ldp w2, wzr, [sp, #-256]!
+# CHECK-NEXT: 2 4 0.50 * ldp w9, w10, [sp, #4]!
+# CHECK-NEXT: 4 5 1.00 * ldpsw x9, x10, [sp, #4]!
+# CHECK-NEXT: 4 5 1.00 * ldpsw x9, x10, [x2, #-256]!
+# CHECK-NEXT: 4 5 1.00 * ldpsw x20, x30, [sp, #252]!
+# CHECK-NEXT: 2 4 1.00 * ldp x21, x29, [x2, #504]!
+# CHECK-NEXT: 2 4 1.00 * ldp x22, x23, [x3, #-512]!
+# CHECK-NEXT: 2 4 1.00 * ldp x24, x25, [x4, #8]!
# CHECK-NEXT: 2 6 0.33 * ldp s29, s28, [sp, #252]!
# CHECK-NEXT: 3 2 0.50 * stp s27, s26, [sp, #-256]!
# CHECK-NEXT: 2 6 0.33 * ldp s1, s2, [x3, #44]!
@@ -1166,9 +1166,9 @@
# CHECK-NEXT: 2 1 0.50 * stnp wzr, w9, [sp, #252]
# CHECK-NEXT: 1 4 0.33 * ldnp w2, wzr, [sp, #-256]
# CHECK-NEXT: 1 4 0.33 * ldnp w9, w10, [sp, #4]
-# CHECK-NEXT: 3 4 1.00 * ldnp x21, x29, [x2, #504]
-# CHECK-NEXT: 3 4 1.00 * ldnp x22, x23, [x3, #-512]
-# CHECK-NEXT: 3 4 1.00 * ldnp x24, x25, [x4, #8]
+# CHECK-NEXT: 1 4 1.00 * ldnp x21, x29, [x2, #504]
+# CHECK-NEXT: 1 4 1.00 * ldnp x22, x23, [x3, #-512]
+# CHECK-NEXT: 1 4 1.00 * ldnp x24, x25, [x4, #8]
# CHECK-NEXT: 1 6 0.33 * ldnp s29, s28, [sp, #252]
# CHECK-NEXT: 2 2 0.50 * stnp s27, s26, [sp, #-256]
# CHECK-NEXT: 1 6 0.33 * ldnp s1, s2, [x3, #44]
@@ -1273,7 +1273,7 @@
# CHECK: Resource pressure per iteration:
# CHECK-NEXT: [0.0] [0.1] [1.0] [1.1] [2.0] [2.1] [2.2] [3] [4.0] [4.1] [5] [6] [7.0] [7.1] [8] [9] [10] [11]
-# CHECK-NEXT: 13.00 13.00 34.00 34.00 48.00 48.00 48.00 102.67 175.67 175.67 325.75 212.75 145.25 145.25 190.00 56.50 65.50 13.00
+# CHECK-NEXT: 13.00 13.00 34.00 34.00 48.00 48.00 48.00 93.67 181.67 181.67 323.50 210.50 143.00 143.00 190.00 56.50 65.50 13.00
# CHECK: Resource pressure by instruction:
# CHECK-NEXT: [0.0] [0.1] [1.0] [1.1] [2.0] [2.1] [2.2] [3] [4.0] [4.1] [5] [6] [7.0] [7.1] [8] [9] [10] [11] Instructions:
@@ -2374,9 +2374,9 @@
# CHECK-NEXT: - - 0.50 0.50 - - - - 0.50 0.50 - - - - - - - - stp wzr, w9, [sp, #252]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldp w2, wzr, [sp, #-256]
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 - - - - - - - - ldp w9, w10, [sp, #4]
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [sp, #4]
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [x2, #-256]
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.50 0.50 0.50 0.50 - - - - ldpsw x20, x30, [sp, #252]
+# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldpsw x9, x10, [sp, #4]
+# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldpsw x9, x10, [x2, #-256]
+# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldpsw x20, x30, [sp, #252]
# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 - - - - - - - - ldp x21, x29, [x2, #504]
# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 - - - - - - - - ldp x22, x23, [x3, #-512]
# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 - - - - - - - - ldp x24, x25, [x4, #8]
@@ -2391,16 +2391,16 @@
# CHECK-NEXT: - - - - - - - - 0.50 0.50 - - - - 0.50 0.50 - - stp q3, q5, [sp]
# CHECK-NEXT: - - - - - - - - 0.50 0.50 - - - - 0.50 0.50 - - stp q17, q19, [sp, #1008]
# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 - - - - - - - - ldp q23, q29, [x1, #-1024]
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w3, w5, [sp], #0
+# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - ldp w3, w5, [sp], #0
# CHECK-NEXT: - - 0.50 0.50 - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - stp wzr, w9, [sp], #252
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w2, wzr, [sp], #-256
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w9, w10, [sp], #4
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x9, x10, [sp], #4
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x9, x10, [x2], #-256
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x20, x30, [sp], #252
-# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x21, x29, [x2], #504
-# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x22, x23, [x3], #-512
-# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x24, x25, [x4], #8
+# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - ldp w2, wzr, [sp], #-256
+# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - ldp w9, w10, [sp], #4
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [sp], #4
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [x2], #-256
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.50 0.50 0.50 0.50 - - - - ldpsw x20, x30, [sp], #252
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x21, x29, [x2], #504
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x22, x23, [x3], #-512
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x24, x25, [x4], #8
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp s29, s28, [sp], #252
# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 0.50 0.50 - - stp s27, s26, [sp], #-256
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp s1, s2, [x3], #44
@@ -2410,16 +2410,16 @@
# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.25 0.25 0.25 0.25 0.50 0.50 - - stp q3, q5, [sp], #0
# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.25 0.25 0.25 0.25 0.50 0.50 - - stp q17, q19, [sp], #1008
# CHECK-NEXT: - - - - - - - 0.67 0.67 0.67 0.25 0.25 0.25 0.25 - - - - ldp q23, q29, [x1], #-1024
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w3, w5, [sp, #0]!
+# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - ldp w3, w5, [sp, #0]!
# CHECK-NEXT: - - 0.50 0.50 - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - stp wzr, w9, [sp, #252]!
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w2, wzr, [sp, #-256]!
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp w9, w10, [sp, #4]!
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x9, x10, [sp, #4]!
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x9, x10, [x2, #-256]!
-# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.75 0.75 0.75 0.75 - - - - ldpsw x20, x30, [sp, #252]!
-# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x21, x29, [x2, #504]!
-# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x22, x23, [x3, #-512]!
-# CHECK-NEXT: - - - - - - - 1.00 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x24, x25, [x4, #8]!
+# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - ldp w2, wzr, [sp, #-256]!
+# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 - - - - ldp w9, w10, [sp, #4]!
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [sp, #4]!
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.50 0.50 0.50 0.50 - - - - ldpsw x9, x10, [x2, #-256]!
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.50 0.50 0.50 0.50 - - - - ldpsw x20, x30, [sp, #252]!
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x21, x29, [x2, #504]!
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x22, x23, [x3, #-512]!
+# CHECK-NEXT: - - - - - - - - 1.00 1.00 0.25 0.25 0.25 0.25 - - - - ldp x24, x25, [x4, #8]!
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp s29, s28, [sp, #252]!
# CHECK-NEXT: - - - - - - - - 0.50 0.50 0.25 0.25 0.25 0.25 0.50 0.50 - - stp s27, s26, [sp, #-256]!
# CHECK-NEXT: - - - - - - - 0.33 0.33 0.33 0.25 0.25 0.25 0.25 - - - - ldp s1, s2, [x3, #44]!
diff --git a/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-writeback.s b/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-writeback.s
index d325e8719ce7e..e93b025ed39c3 100644
--- a/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-writeback.s
+++ b/llvm/test/tools/llvm-mca/AArch64/Neoverse/V1-writeback.s
@@ -3233,12 +3233,12 @@ add x0, x27, 1
# CHECK: Iterations: 100
# CHECK-NEXT: Instructions: 1000
# CHECK-NEXT: Total Cycles: 507
-# CHECK-NEXT: Total uOps: 2300
+# CHECK-NEXT: Total uOps: 1900
# CHECK: Dispatch Width: 8
-# CHECK-NEXT: uOps Per Cycle: 4.54
+# CHECK-NEXT: uOps Per Cycle: 3.75
# CHECK-NEXT: IPC: 1.97
-# CHECK-NEXT: Block RThroughput: 3.5
+# CHECK-NEXT: Block RThroughput: 4.5
# CHECK: Timeline view:
# CHECK-NEXT: 01
@@ -3248,12 +3248,12 @@ add x0, x27, 1
# CHECK-NEXT: [0,1] D=eE--R .. add x0, x27, #1
# CHECK-NEXT: [0,2] D=eeeeER .. ldp w1, w2, [x27, #248]!
# CHECK-NEXT: [0,3] D==eE--R .. add x0, x27, #1
-# CHECK-NEXT: [0,4] .D=eeeeER .. ldp x1, x2, [x27, #496]!
+# CHECK-NEXT: [0,4] D==eeeeER .. ldp x1, x2, [x27, #496]!
# CHECK-NEXT: [0,5] .D==eE--R .. add x0, x27, #1
-# CHECK-NEXT: [0,6] . D=eeeeeER. ldpsw x1, x2, [x27], #248
-# CHECK-NEXT: [0,7] . D==eE---R. add x0, x27, #1
-# CHECK-NEXT: [0,8] . D=eeeeeER ldpsw x1, x2, [x27, #248]!
-# CHECK-NEXT: [0,9] . D==eE---R add x0, x27, #1
+# CHECK-NEXT: [0,6] .D==eeeeeER. ldpsw x1, x2, [x27], #248
+# CHECK-NEXT: [0,7] .D===eE---R. add x0, x27, #1
+# CHECK-NEXT: [0,8] . D==eeeeeER ldpsw x1, x2, [x27, #248]!
+# CHECK-NEXT: [0,9] . D===eE---R add x0, x27, #1
# CHECK: Average Wait times (based on the timeline view):
# CHECK-NEXT: [0]: Executions
@@ -3266,13 +3266,13 @@ add x0, x27, 1
# CHECK-NEXT: 1. 1 2.0 0.0 2.0 add x0, x27, #1
# CHECK-NEXT: 2. 1 2.0 0.0 0.0 ldp w1, w2, [x27, #248]!
# CHECK-NEXT: 3. 1 3.0 0.0 2.0 add x0, x27, #1
-# CHECK-NEXT: 4. 1 2.0 0.0 0.0 ldp x1, x2, [x27, #496]!
+# CHECK-NEXT: 4. 1 3.0 0.0 0.0 ldp x1, x2, [x27, #496]!
# CHECK-NEXT: 5. 1 3.0 0.0 2.0 add x0, x27, #1
-# CHECK-NEXT: 6. 1 2.0 0.0 0.0 ldpsw x1, x2, [x27], #248
-# CHECK-NEXT: 7. 1 3.0 0.0 3.0 add x0, x27, #1
-# CHECK-NEXT: 8. 1 2.0 0.0 0.0 ldpsw x1, x2, [x27, #248]!
-# CHECK-NEXT: 9. 1 3.0 0.0 3.0 add x0, x27, #1
-# CHECK-NEXT: 10 2.3 0.1 1.2 <total>
+# CHECK-NEXT: 6. 1 3.0 0.0 0.0 ldpsw x1, x2, [x27], #248
+# CHECK-NEXT: 7. 1 4.0 0.0 3.0 add x0, x27, #1
+# CHECK-NEXT: 8. 1 3.0 0.0 0.0 ldpsw x1, x2, [x27, #248]!
+# CHECK-NEXT: 9. 1 4.0 0.0 3.0 add x0, x27, #1
+# CHECK-NEXT: 10 2.8 0.1 1.2 <total>
# CHECK: [46] Code Region - G47
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