[clang] [Mips] Allow const pointers for the MSA load intrinsics (PR #193508)

[Anand Mistry via cfe-commits]

https://github.com/akmistry-msft updated https://github.com/llvm/llvm-project/pull/193508

>From 02c8a2798e9a0a3439ef78910942edf1fe23f728 Mon Sep 17 00:00:00 2001
From: Anand Mistry <anandmistry at microsoft.com>
Date: Wed, 22 Apr 2026 07:32:35 +0100
Subject: [PATCH] [Mips] Allow const pointers for the MSA load intrinsics

This matches the prototypes of the GCC builtins.
---
 clang/include/clang/Basic/BuiltinsMips.def |  8 ++++----
 clang/test/CodeGen/Mips/msa-const-ld.c     | 24 ++++++++++++++++++++++
 2 files changed, 28 insertions(+), 4 deletions(-)
 create mode 100644 clang/test/CodeGen/Mips/msa-const-ld.c

diff --git a/clang/include/clang/Basic/BuiltinsMips.def b/clang/include/clang/Basic/BuiltinsMips.def
index 2aca4cb226bc2..4315a5ea4b986 100644
--- a/clang/include/clang/Basic/BuiltinsMips.def
+++ b/clang/include/clang/Basic/BuiltinsMips.def
@@ -630,10 +630,10 @@ BUILTIN(__builtin_msa_insve_h, "V8SsV8SsIUiV8Ss", "nc")
 BUILTIN(__builtin_msa_insve_w, "V4SiV4SiIUiV4Si", "nc")
 BUILTIN(__builtin_msa_insve_d, "V2SLLiV2SLLiIUiV2SLLi", "nc")
 
-BUILTIN(__builtin_msa_ld_b, "V16Scv*Ii", "nc")
-BUILTIN(__builtin_msa_ld_h, "V8Ssv*Ii", "nc")
-BUILTIN(__builtin_msa_ld_w, "V4Siv*Ii", "nc")
-BUILTIN(__builtin_msa_ld_d, "V2SLLiv*Ii", "nc")
+BUILTIN(__builtin_msa_ld_b, "V16ScvC*Ii", "nc")
+BUILTIN(__builtin_msa_ld_h, "V8SsvC*Ii", "nc")
+BUILTIN(__builtin_msa_ld_w, "V4SivC*Ii", "nc")
+BUILTIN(__builtin_msa_ld_d, "V2SLLivC*Ii", "nc")
 
 BUILTIN(__builtin_msa_ldr_d, "V2SLLiv*Ii", "nc")
 BUILTIN(__builtin_msa_ldr_w, "V4Siv*Ii", "nc")
diff --git a/clang/test/CodeGen/Mips/msa-const-ld.c b/clang/test/CodeGen/Mips/msa-const-ld.c
new file mode 100644
index 0000000000000..e587e089b9001
--- /dev/null
+++ b/clang/test/CodeGen/Mips/msa-const-ld.c
@@ -0,0 +1,24 @@
+// REQUIRES: mips-registered-target
+// RUN: %clang_cc1 -triple mips-unknown-linux-gnu -emit-llvm %s \
+// RUN:            -Werror \
+// RUN:            -target-feature +msa -target-feature +fp64 \
+// RUN:            -mfloat-abi hard -o - | FileCheck %s
+
+#include <msa.h>
+
+void test(void) {
+  const v16i8 v16i8_a = (v16i8) {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
+  v16i8 v16i8_r;
+  const v8i16 v8i16_a = (v8i16) {0, 1, 2, 3, 4, 5, 6, 7};
+  v8i16 v8i16_r;
+  const v4i32 v4i32_a = (v4i32) {0, 1, 2, 3};
+  v4i32 v4i32_r;
+  const v2i64 v2i64_a = (v2i64) {0, 1};
+  v2i64 v2i64_r;
+
+  v16i8_r = __msa_ld_b(&v16i8_a, 1); // CHECK: call <16 x i8>  @llvm.mips.ld.b(
+  v8i16_r = __msa_ld_h(&v8i16_a, 2); // CHECK: call <8  x i16> @llvm.mips.ld.h(
+  v4i32_r = __msa_ld_w(&v4i32_a, 4); // CHECK: call <4  x i32> @llvm.mips.ld.w(
+  v2i64_r = __msa_ld_d(&v2i64_a, 8); // CHECK: call <2  x i64> @llvm.mips.ld.d(
+
+}