[clang] [Clang][AArch64] Fix 'svzero_za' intrinsic to take no arguments. (PR #82648)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Sander de Smalen (sdesmalen-arm)

<details>
<summary>Changes</summary>

We previously defined svzero_za as:

  void svzero_za();

rather than:

  void svzero_za(void);

Which meant that Clang accepted arguments. Compiling for example `svzero_za(<non-constant integer>)` ended up with incorrect IR and a compiler crash because it couldn't select an instruction for it.

---
Full diff: https://github.com/llvm/llvm-project/pull/82648.diff


2 Files Affected:

- (modified) clang/include/clang/Basic/arm_sme.td (+1-1) 
- (added) clang/test/Sema/aarch64-sme-intrinsics/acle_sme_zero.c (+7) 


``````````diff
diff --git a/clang/include/clang/Basic/arm_sme.td b/clang/include/clang/Basic/arm_sme.td
index 2da0e8d2aba9a4..1ac6d5170ea283 100644
--- a/clang/include/clang/Basic/arm_sme.td
+++ b/clang/include/clang/Basic/arm_sme.td
@@ -142,7 +142,7 @@ let TargetGuard = "sme" in {
   def SVZERO_MASK_ZA : SInst<"svzero_mask_za", "vi", "", MergeNone, "aarch64_sme_zero",
                              [IsOverloadNone, IsStreamingCompatible, IsInOutZA],
                              [ImmCheck<0, ImmCheck0_255>]>;
-  def SVZERO_ZA      : SInst<"svzero_za", "v", "", MergeNone, "aarch64_sme_zero",
+  def SVZERO_ZA      : SInst<"svzero_za", "vv", "", MergeNone, "aarch64_sme_zero",
                              [IsOverloadNone, IsStreamingCompatible, IsOutZA]>;
 }
 
diff --git a/clang/test/Sema/aarch64-sme-intrinsics/acle_sme_zero.c b/clang/test/Sema/aarch64-sme-intrinsics/acle_sme_zero.c
new file mode 100644
index 00000000000000..e0b6c391d98902
--- /dev/null
+++ b/clang/test/Sema/aarch64-sme-intrinsics/acle_sme_zero.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sme -target-feature +sve -fsyntax-only -verify %s
+
+void test_svzero_args(uint64_t m) {
+  svzero_za(0); // expected-error {{too many arguments to function call, expected 0, have 1}}
+  svzero_za(m); // expected-error {{too many arguments to function call, expected 0, have 1}}
+  svzero_mask_za(m); // expected-error {{argument to 'svzero_mask_za' must be a constant integer}}
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/82648