1 files changed, 60 insertions, 0 deletions
diff --git a/test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep-and-gvn.ll b/test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep-and-gvn.ll
new file mode 100644
index 0000000000..66f4096fa9
--- /dev/null
+++ b/test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep-and-gvn.ll
@@ -0,0 +1,60 @@
+; RUN: llc < %s -march=nvptx -mcpu=sm_20 | FileCheck %s --check-prefix=PTX
+; RUN: llc < %s -march=nvptx64 -mcpu=sm_20 | FileCheck %s --check-prefix=PTX
+; RUN: opt < %s -S -separate-const-offset-from-gep -gvn -dce | FileCheck %s --check-prefix=IR
+
+; Verifies the SeparateConstOffsetFromGEP pass.
+; The following code computes
+; *output = array[x][y] + array[x][y+1] + array[x+1][y] + array[x+1][y+1]
+;
+; We expect SeparateConstOffsetFromGEP to transform it to
+;
+; float *base = &a[x][y];
+; *output = base[0] + base[1] + base[32] + base[33];
+;
+; so the backend can emit PTX that uses fewer virtual registers.
+
+target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
+target triple = "nvptx64-unknown-unknown"
+
+@array = internal addrspace(3) constant [32 x [32 x float]] zeroinitializer, align 4
+
+define void @sum_of_array(i32 %x, i32 %y, float* nocapture %output) {
+.preheader:
+  %0 = zext i32 %y to i64
+  %1 = zext i32 %x to i64
+  %2 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %1, i64 %0
+  %3 = addrspacecast float addrspace(3)* %2 to float*
+  %4 = load float* %3, align 4
+  %5 = fadd float %4, 0.000000e+00
+  %6 = add i32 %y, 1
+  %7 = zext i32 %6 to i64
+  %8 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %1, i64 %7
+  %9 = addrspacecast float addrspace(3)* %8 to float*
+  %10 = load float* %9, align 4
+  %11 = fadd float %5, %10
+  %12 = add i32 %x, 1
+  %13 = zext i32 %12 to i64
+  %14 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %13, i64 %0
+  %15 = addrspacecast float addrspace(3)* %14 to float*
+  %16 = load float* %15, align 4
+  %17 = fadd float %11, %16
+  %18 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %13, i64 %7
+  %19 = addrspacecast float addrspace(3)* %18 to float*
+  %20 = load float* %19, align 4
+  %21 = fadd float %17, %20
+  store float %21, float* %output, align 4
+  ret void
+}
+
+; PTX-LABEL: sum_of_array(
+; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG:%(rl|r)[0-9]+]]{{\]}}
+; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+4{{\]}}
+; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+128{{\]}}
+; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+132{{\]}}
+
+; IR-LABEL: @sum_of_array(
+; IR: [[BASE_PTR:%[0-9]+]] = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i32 %x, i32 %y
+; IR: [[BASE_INT:%[0-9]+]] = ptrtoint float addrspace(3)* [[BASE_PTR]] to i64
+; IR: %5 = add i64 [[BASE_INT]], 4
+; IR: %10 = add i64 [[BASE_INT]], 128
+; IR: %15 = add i64 [[BASE_INT]], 132