| ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck %s |
| |
| ; CHECK-LABEL: {{^}}recursive: |
| ; CHECK: ScratchSize: 16 |
| define void @recursive() { |
| call void @recursive() |
| store volatile i32 0, i32 addrspace(1)* undef |
| ret void |
| } |
| |
| ; CHECK-LABEL: {{^}}tail_recursive: |
| ; CHECK: ScratchSize: 0 |
| define void @tail_recursive() { |
| tail call void @tail_recursive() |
| ret void |
| } |
| |
| define void @calls_tail_recursive() norecurse { |
| tail call void @tail_recursive() |
| ret void |
| } |
| |
| ; CHECK-LABEL: {{^}}tail_recursive_with_stack: |
| define void @tail_recursive_with_stack() { |
| %alloca = alloca i32, addrspace(5) |
| store volatile i32 0, i32 addrspace(5)* %alloca |
| tail call void @tail_recursive_with_stack() |
| ret void |
| } |
| |
| ; For an arbitrary recursive call, report a large number for unknown stack usage. |
| ; CHECK-LABEL: {{^}}calls_recursive: |
| ; CHECK: .amdhsa_private_segment_fixed_size 16400{{$}} |
| define amdgpu_kernel void @calls_recursive() { |
| call void @recursive() |
| ret void |
| } |
| |
| ; Make sure we do not report a huge stack size for tail recursive |
| ; functions |
| ; CHECK-LABEL: {{^}}kernel_indirectly_calls_tail_recursive: |
| ; CHECK: .amdhsa_private_segment_fixed_size 0{{$}} |
| define amdgpu_kernel void @kernel_indirectly_calls_tail_recursive() { |
| call void @calls_tail_recursive() |
| ret void |
| } |
| |
| ; TODO: Even though tail_recursive is only called as a tail call, we |
| ; end up treating it as generally recursive call from the regular call |
| ; in the kernel. |
| |
| ; CHECK-LABEL: {{^}}kernel_calls_tail_recursive: |
| ; CHECK: .amdhsa_private_segment_fixed_size 16384{{$}} |
| define amdgpu_kernel void @kernel_calls_tail_recursive() { |
| call void @tail_recursive() |
| ret void |
| } |
| |
| ; CHECK-LABEL: {{^}}kernel_calls_tail_recursive_with_stack: |
| ; CHECK: .amdhsa_private_segment_fixed_size 16384{{$}} |
| define amdgpu_kernel void @kernel_calls_tail_recursive_with_stack() { |
| call void @tail_recursive_with_stack() |
| ret void |
| } |