[llvm] [AArch64][GlobalISel] Add patterns for scalar sqdmlal/sqdmlsl (PR #187246)

[Joshua Rodriguez via llvm-commits]

https://github.com/JoshdRod created https://github.com/llvm/llvm-project/pull/187246

None

>From bbb8ab50228d32b29c05a0c6b005bc36e545ae7a Mon Sep 17 00:00:00 2001
From: Josh Rodriguez <josh.rodriguez at arm.com>
Date: Wed, 18 Mar 2026 12:07:08 +0000
Subject: [PATCH] [AArch64][GlobalISel] Add patterns for scalar sqdmlal/sqdmlsl

---
 llvm/lib/Target/AArch64/AArch64InstrInfo.td               | 8 ++++++++
 llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp | 1 +
 2 files changed, 9 insertions(+)

diff --git a/llvm/lib/Target/AArch64/AArch64InstrInfo.td b/llvm/lib/Target/AArch64/AArch64InstrInfo.td
index 84566946260c3..004edb988bf33 100644
--- a/llvm/lib/Target/AArch64/AArch64InstrInfo.td
+++ b/llvm/lib/Target/AArch64/AArch64InstrInfo.td
@@ -6631,10 +6631,18 @@ def : Pat<(f64 (AArch64sqadd FPR64:$Rd,
                 (AArch64sqdmull FPR32:$Rn, FPR32:$Rm))),
           (SQDMLALi32 FPR64:$Rd, FPR32:$Rn, FPR32:$Rm)>;
 
+def : Pat<(i64 (int_aarch64_neon_sqadd (i64 FPR64:$Rd),
+                (int_aarch64_neon_sqdmulls_scalar FPR32:$Rn, FPR32:$Rm))),
+          (SQDMLALi32 FPR64:$Rd, FPR32:$Rn, FPR32:$Rm)>;
+
 def : Pat<(f64 (AArch64sqsub FPR64:$Rd,
                (AArch64sqdmull FPR32:$Rn, FPR32:$Rm))),
           (SQDMLSLi32 FPR64:$Rd, FPR32:$Rn, FPR32:$Rm)>;
 
+def : Pat<(i64 (int_aarch64_neon_sqsub (i64 FPR64:$Rd),
+                (int_aarch64_neon_sqdmulls_scalar FPR32:$Rn, FPR32:$Rm))),
+          (SQDMLSLi32 FPR64:$Rd, FPR32:$Rn, FPR32:$Rm)>;
+
 //===----------------------------------------------------------------------===//
 // Advanced SIMD two scalar instructions.
 //===----------------------------------------------------------------------===//
diff --git a/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp b/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp
index 03f714cddec83..ca881b8dbb008 100644
--- a/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp
+++ b/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp
@@ -621,6 +621,7 @@ static bool isFPIntrinsic(const MachineRegisterInfo &MRI,
   case Intrinsic::aarch64_neon_sqrdmulh:
   case Intrinsic::aarch64_neon_sqadd:
   case Intrinsic::aarch64_neon_sqsub:
+  case Intrinsic::aarch64_neon_sqdmulls_scalar:
   case Intrinsic::aarch64_neon_srshl:
   case Intrinsic::aarch64_neon_urshl:
   case Intrinsic::aarch64_neon_sqshl: