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