[clang] [Clang] Fix incorrect passing of _BitInt args (PR #90741)

[via cfe-commits]

https://github.com/Lukacma updated https://github.com/llvm/llvm-project/pull/90741

>From 1d6b0bb8479edce69e054ce461482bdbafb4eb4e Mon Sep 17 00:00:00 2001
From: Marian Lukac <Marian.Lukac at arm.com>
Date: Wed, 1 May 2024 15:20:05 +0000
Subject: [PATCH] [Clang] Fix incorrect passing of _BitInt args

---
 clang/lib/CodeGen/Targets/AArch64.cpp       |  2 +-
 clang/test/CodeGen/aarch64-bitint-argpass.c | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 clang/test/CodeGen/aarch64-bitint-argpass.c

diff --git a/clang/lib/CodeGen/Targets/AArch64.cpp b/clang/lib/CodeGen/Targets/AArch64.cpp
index 4c32f510101f0..7daf416b624fa 100644
--- a/clang/lib/CodeGen/Targets/AArch64.cpp
+++ b/clang/lib/CodeGen/Targets/AArch64.cpp
@@ -302,7 +302,7 @@ AArch64ABIInfo::classifyArgumentType(QualType Ty, bool IsVariadic,
 
     if (const auto *EIT = Ty->getAs<BitIntType>())
       if (EIT->getNumBits() > 128)
-        return getNaturalAlignIndirect(Ty);
+        return getNaturalAlignIndirect(Ty, false);
 
     return (isPromotableIntegerTypeForABI(Ty) && isDarwinPCS()
                 ? ABIArgInfo::getExtend(Ty)
diff --git a/clang/test/CodeGen/aarch64-bitint-argpass.c b/clang/test/CodeGen/aarch64-bitint-argpass.c
new file mode 100644
index 0000000000000..c7333bac75c1a
--- /dev/null
+++ b/clang/test/CodeGen/aarch64-bitint-argpass.c
@@ -0,0 +1,14 @@
+// REQUIRES: arm-registered-target
+// RUN: %clang_cc1 -triple aarch64-none-elf \
+// RUN:   -O2 \
+// RUN:   -emit-llvm -fexperimental-max-bitint-width=1024 -o - %s | FileCheck %s
+
+_BitInt(129) v = -1;
+int h(_BitInt(129));
+
+// CHECK: declare i32 @h(ptr noundef)
+int largerthan128() {
+   return h(v);
+}
+
+