[llvm] [SDAG] Precommit tests for #126207 (NFC) (PR #126208)

[Cullen Rhodes via llvm-commits]

https://github.com/c-rhodes created https://github.com/llvm/llvm-project/pull/126208

Add missing test coverage for codepaths touched by #126207.

>From 1f68bf1b7745a5e71c68f226b03d688f6f9cd54a Mon Sep 17 00:00:00 2001
From: Cullen Rhodes <cullen.rhodes at arm.com>
Date: Thu, 6 Feb 2025 16:22:46 +0000
Subject: [PATCH] [SDAG] Precommit tests for #126207 (NFC)

Add missing test coverage for codepaths touched by #126207.
---
 llvm/test/CodeGen/AArch64/memcpy-f128.ll |  2 +-
 llvm/test/CodeGen/ARM/memcpy-inline.ll   | 27 ++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/llvm/test/CodeGen/AArch64/memcpy-f128.ll b/llvm/test/CodeGen/AArch64/memcpy-f128.ll
index 5b354dd23e01dfa..229c0034b6f636c 100644
--- a/llvm/test/CodeGen/AArch64/memcpy-f128.ll
+++ b/llvm/test/CodeGen/AArch64/memcpy-f128.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -mtriple=aarch64-linux-gnu | FileCheck %s
+; RUN: llc < %s -mtriple=aarch64-linux-gnu -mattr=-neon | FileCheck %s
 
 %structA = type { i128 }
 @stubA = internal unnamed_addr constant %structA zeroinitializer, align 8
diff --git a/llvm/test/CodeGen/ARM/memcpy-inline.ll b/llvm/test/CodeGen/ARM/memcpy-inline.ll
index 596a58afe46e5bb..89db22d1f0ed53c 100644
--- a/llvm/test/CodeGen/ARM/memcpy-inline.ll
+++ b/llvm/test/CodeGen/ARM/memcpy-inline.ll
@@ -12,6 +12,7 @@
 @.str4 = private unnamed_addr constant [18 x i8] c"DHRYSTONE PROGR  \00", align 1
 @.str5 = private unnamed_addr constant [7 x i8] c"DHRYST\00", align 1
 @.str6 = private unnamed_addr constant [14 x i8] c"/tmp/rmXXXXXX\00", align 1
+ at empty = private unnamed_addr constant [31 x i8] zeroinitializer, align 1
 @spool.splbuf = internal global [512 x i8] zeroinitializer, align 16
 
 define i32 @t0() {
@@ -282,5 +283,31 @@ entry:
   ret void
 }
 
+define void @copy_from_zero_constant(ptr nocapture %C) nounwind {
+; CHECK-LABEL: copy_from_zero_constant:
+; CHECK:       @ %bb.0: @ %entry
+; CHECK-NEXT:    vmov.i32 q8, #0x0
+; CHECK-NEXT:    movs r1, #15
+; CHECK-NEXT:    vst1.8 {d16, d17}, [r0], r1
+; CHECK-NEXT:    vst1.8 {d16, d17}, [r0]
+; CHECK-NEXT:    bx lr
+;
+; CHECK-T1-LABEL: copy_from_zero_constant:
+; CHECK-T1:       @ %bb.0: @ %entry
+; CHECK-T1-NEXT:    .save {r7, lr}
+; CHECK-T1-NEXT:    push {r7, lr}
+; CHECK-T1-NEXT:    ldr r1, .LCPI8_0
+; CHECK-T1-NEXT:    movs r2, #31
+; CHECK-T1-NEXT:    bl __aeabi_memcpy
+; CHECK-T1-NEXT:    pop {r7, pc}
+; CHECK-T1-NEXT:    .p2align 2
+; CHECK-T1-NEXT:  @ %bb.1:
+; CHECK-T1-NEXT:  .LCPI8_0:
+; CHECK-T1-NEXT:    .long .Lempty
+entry:
+  tail call void @llvm.memcpy.p0.p0.i64(ptr %C, ptr @empty, i64 31, i1 false)
+  ret void
+}
+
 declare void @llvm.memcpy.p0.p0.i32(ptr nocapture, ptr nocapture, i32, i1) nounwind
 declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture, i64, i1) nounwind