https://github.com/ssahasra created
https://github.com/llvm/llvm-project/pull/73920
The Clang declaration of the wave-64 builtin uses "UL" as the return type,
which is interpreted as a 32-bit unsigned integer on Windows. This emits an
incorrect LLVM declaration with i32 return type instead of i64. The clang
declaration needs to be fixed to use "WU" instead.
>From d5945a3926567c67b0c355a95b4bc98446f2d764 Mon Sep 17 00:00:00 2001
From: Sameer Sahasrabuddhe <sameer.sahasrabud...@amd.com>
Date: Thu, 30 Nov 2023 12:13:23 +0530
Subject: [PATCH] [clang][AMDGPU] precommit test for ballot on Windows
The Clang declaration of the wave-64 builtin uses "UL" as the return type, which
is interpreted as a 32-bit unsigned integer on Windows. This emits an incorrect
LLVM declaration with i32 return type instead of i64. The clang declaration
needs to be fixed to use "WU" instead.
---
clang/test/CodeGenHIP/ballot.cpp | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
create mode 100644 clang/test/CodeGenHIP/ballot.cpp
diff --git a/clang/test/CodeGenHIP/ballot.cpp b/clang/test/CodeGenHIP/ballot.cpp
new file mode 100644
index 000000000000000..823b1583a42fc02
--- /dev/null
+++ b/clang/test/CodeGenHIP/ballot.cpp
@@ -0,0 +1,21 @@
+// REQUIRES: amdgpu-registered-target
+// XFAIL: system-windows
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa -target-cpu gfx900 -x hip
-emit-llvm -fcuda-is-device -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa -target-cpu gfx900 -x hip -S
-fcuda-is-device -o - %s | FileCheck %s --check-prefix=GFX9
+
+// FIXME: The Clang declaration of the wave-64 builtin uses "UL" as the return
+// type, which is interpreted as a 32-bit unsigned integer on Windows. This
+// emits an incorrect LLVM declaration with i32 return type instead of i64. The
+// clang declaration needs to be fixed to use "WU" instead.
+
+// CHECK-LABEL: @_Z3fooi
+// CHECK: call i64 @llvm.amdgcn.ballot.i64
+
+// GFX9-LABEL: _Z3fooi:
+// GFX9: v_cmp_ne_u32_e64
+
+#define __device__ __attribute__((device))
+
+__device__ unsigned long long foo(int p) {
+ return __builtin_amdgcn_ballot_w64(p);
+}
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