1 files changed, 23 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/AMDGPU/mul_int24.ll b/llvm/test/CodeGen/AMDGPU/mul_int24.ll
new file mode 100644
index 00000000000..7609dcc87af
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/mul_int24.ll
@@ -0,0 +1,23 @@
+; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s --check-prefix=EG --check-prefix=FUNC
+; RUN: llc < %s -march=r600 -mcpu=cayman | FileCheck %s --check-prefix=CM --check-prefix=FUNC
+; RUN: llc < %s -march=amdgcn -mcpu=SI -verify-machineinstrs | FileCheck %s --check-prefix=SI --check-prefix=FUNC
+; RUN: llc < %s -march=amdgcn -mcpu=tonga -verify-machineinstrs | FileCheck %s --check-prefix=SI --check-prefix=FUNC
+
+; FUNC-LABEL: {{^}}i32_mul24:
+; Signed 24-bit multiply is not supported on pre-Cayman GPUs.
+; EG: MULLO_INT
+; Make sure we are not masking the inputs
+; CM-NOT: AND
+; CM: MUL_INT24
+; SI-NOT: and
+; SI: v_mul_i32_i24
+define void @i32_mul24(i32 addrspace(1)* %out, i32 %a, i32 %b) {
+entry:
+  %0 = shl i32 %a, 8
+  %a_24 = ashr i32 %0, 8
+  %1 = shl i32 %b, 8
+  %b_24 = ashr i32 %1, 8
+  %2 = mul i32 %a_24, %b_24
+  store i32 %2, i32 addrspace(1)* %out
+  ret void
+}