04fff547e2
Currently the return address ABI registers s[30:31], which fall in the call clobbered register range, are added as a live-in on the function entry to preserve its value when we have calls so that it gets saved and restored around the calls. But the DWARF unwind information (CFI) needs to track where the return address resides in a frame and the above approach makes it difficult to track the return address when the CFI information is emitted during the frame lowering, due to the involvment of understanding the control flow. This patch moves the return address ABI registers s[30:31] into callee saved registers range and stops adding live-in for return address registers, so that the CFI machinery will know where the return address resides when CSR save/restore happen during the frame lowering. And doing the above poses an issue that now the return instruction uses undefined register `sgpr30_sgpr31`. This is resolved by hiding the return address register use by the return instruction through the `SI_RETURN` pseudo instruction, which doesn't take any input operands, until the `SI_RETURN` pseudo gets lowered to the `S_SETPC_B64_return` during the `expandPostRAPseudo()`. As an added benefit, this patch simplifies overall return instruction handling. Note: The AMDGPU CFI changes are there only in the downstream code and another version of this patch will be posted for review for the downstream code. Reviewed By: arsenm, ronlieb Differential Revision: https://reviews.llvm.org/D114652
328 lines
11 KiB
LLVM
328 lines
11 KiB
LLVM
; RUN: llc -mtriple=amdgcn-amd-amdhsa --amdhsa-code-object-version=2 -mcpu=kaveri -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,HSA %s
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; RUN: llc -mtriple=amdgcn-mesa-mesa3d -mcpu=tahiti -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,MESA %s
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; GCN-LABEL: {{^}}kernel_implicitarg_ptr_empty:
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; HSA: enable_sgpr_kernarg_segment_ptr = 1
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; HSA: kernarg_segment_byte_size = 56
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; HSA: kernarg_segment_alignment = 4
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; MESA: enable_sgpr_kernarg_segment_ptr = 1
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; MESA: kernarg_segment_byte_size = 16
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; MESA: kernarg_segment_alignment = 4
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; HSA: s_load_dword s0, s[4:5], 0x0
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define amdgpu_kernel void @kernel_implicitarg_ptr_empty() #0 {
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load = load volatile i32, i32 addrspace(4)* %cast
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ret void
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}
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; GCN-LABEL: {{^}}kernel_implicitarg_ptr_empty_0implicit:
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; HSA: enable_sgpr_kernarg_segment_ptr = 0
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; HSA: kernarg_segment_byte_size = 0
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; HSA: kernarg_segment_alignment = 4
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; MESA: enable_sgpr_kernarg_segment_ptr = 1
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; MESA: kernarg_segment_byte_size = 16
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; MESA: kernarg_segment_alignment = 4
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; HSA: s_mov_b64 [[NULL:s\[[0-9]+:[0-9]+\]]], 0{{$}}
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; HSA: s_load_dword s0, [[NULL]], 0x0
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; MESA: s_load_dword s0, s[4:5], 0x0
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define amdgpu_kernel void @kernel_implicitarg_ptr_empty_0implicit() #3 {
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load = load volatile i32, i32 addrspace(4)* %cast
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ret void
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}
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; GCN-LABEL: {{^}}opencl_kernel_implicitarg_ptr_empty:
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; GCN: enable_sgpr_kernarg_segment_ptr = 1
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; HSA: kernarg_segment_byte_size = 48
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; HSA: kernarg_segment_alignment = 4
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; MESA: kernarg_segment_byte_size = 16
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; MESA: kernarg_segment_alignment = 4
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; HSA: s_load_dword s0, s[4:5], 0x0
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define amdgpu_kernel void @opencl_kernel_implicitarg_ptr_empty() #1 {
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load = load volatile i32, i32 addrspace(4)* %cast
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ret void
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}
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; GCN-LABEL: {{^}}kernel_implicitarg_ptr:
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; GCN: enable_sgpr_kernarg_segment_ptr = 1
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; HSA: kernarg_segment_byte_size = 168
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; HSA: kernarg_segment_alignment = 4
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; MESA: kernarg_segment_byte_size = 128
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; MESA: kernarg_segment_alignment = 4
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; HSA: s_load_dword s0, s[4:5], 0x1c
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define amdgpu_kernel void @kernel_implicitarg_ptr([112 x i8]) #0 {
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load = load volatile i32, i32 addrspace(4)* %cast
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ret void
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}
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; GCN-LABEL: {{^}}opencl_kernel_implicitarg_ptr:
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; GCN: enable_sgpr_kernarg_segment_ptr = 1
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; HSA: kernarg_segment_byte_size = 160
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; HSA: kernarg_segment_alignment = 4
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; MESA: kernarg_segment_byte_size = 128
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; MESA: kernarg_segment_alignment = 4
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; HSA: s_load_dword s0, s[4:5], 0x1c
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define amdgpu_kernel void @opencl_kernel_implicitarg_ptr([112 x i8]) #1 {
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load = load volatile i32, i32 addrspace(4)* %cast
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ret void
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}
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; GCN-LABEL: {{^}}func_implicitarg_ptr:
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; GCN: s_waitcnt
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; GCN: s_load_dword s{{[0-9]+}}, s[8:9], 0x0
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; GCN-NEXT: s_waitcnt
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; GCN-NEXT: s_setpc_b64
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define void @func_implicitarg_ptr() #0 {
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load = load volatile i32, i32 addrspace(4)* %cast
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ret void
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}
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; GCN-LABEL: {{^}}opencl_func_implicitarg_ptr:
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; GCN: s_waitcnt
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; GCN: s_load_dword s{{[0-9]+}}, s[8:9], 0x0
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; GCN-NEXT: s_waitcnt
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; GCN-NEXT: s_setpc_b64
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define void @opencl_func_implicitarg_ptr() #0 {
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load = load volatile i32, i32 addrspace(4)* %cast
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ret void
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}
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; GCN-LABEL: {{^}}kernel_call_implicitarg_ptr_func_empty:
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; HSA: enable_sgpr_kernarg_segment_ptr = 1
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; HSA: kernarg_segment_byte_size = 56
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; HSA: kernarg_segment_alignment = 4
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; MESA: enable_sgpr_kernarg_segment_ptr = 1
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; MESA: kernarg_segment_byte_size = 16
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; MESA: kernarg_segment_alignment = 4
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; GCN: s_mov_b64 s[8:9], s[4:5]
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; GCN: s_swappc_b64
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define amdgpu_kernel void @kernel_call_implicitarg_ptr_func_empty() #0 {
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call void @func_implicitarg_ptr()
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ret void
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}
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; GCN-LABEL: {{^}}kernel_call_implicitarg_ptr_func_empty_implicit0:
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; HSA: enable_sgpr_kernarg_segment_ptr = 0
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; HSA: kernarg_segment_byte_size = 0
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; HSA: kernarg_segment_alignment = 4
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; MESA: enable_sgpr_kernarg_segment_ptr = 1
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; MESA: kernarg_segment_byte_size = 16
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; MESA: kernarg_segment_alignment = 4
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; HSA: s_mov_b64 s[8:9], 0{{$}}
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; MESA: s_mov_b64 s[8:9], s[4:5]{{$}}
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; GCN: s_swappc_b64
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define amdgpu_kernel void @kernel_call_implicitarg_ptr_func_empty_implicit0() #3 {
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call void @func_implicitarg_ptr()
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ret void
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}
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; GCN-LABEL: {{^}}opencl_kernel_call_implicitarg_ptr_func_empty:
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; GCN: enable_sgpr_kernarg_segment_ptr = 1
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; HSA: kernarg_segment_byte_size = 48
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; HSA: kernarg_segment_alignment = 4
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; MESA: kernarg_segment_byte_size = 16
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; GCN: s_mov_b64 s[8:9], s[4:5]
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; GCN-NOT: s4
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; GCN-NOT: s5
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; GCN: s_swappc_b64
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define amdgpu_kernel void @opencl_kernel_call_implicitarg_ptr_func_empty() #1 {
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call void @func_implicitarg_ptr()
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ret void
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}
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; GCN-LABEL: {{^}}kernel_call_implicitarg_ptr_func:
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; GCN: enable_sgpr_kernarg_segment_ptr = 1
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; HSA: kernarg_segment_byte_size = 168
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; HSA: kernarg_segment_alignment = 4
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; MESA: kernarg_segment_byte_size = 128
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; MESA: kernarg_segment_alignment = 4
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; HSA: s_add_u32 s8, s4, 0x70
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; MESA: s_add_u32 s8, s4, 0x70
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; GCN: s_addc_u32 s9, s5, 0{{$}}
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; GCN: s_swappc_b64
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define amdgpu_kernel void @kernel_call_implicitarg_ptr_func([112 x i8]) #0 {
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call void @func_implicitarg_ptr()
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ret void
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}
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; GCN-LABEL: {{^}}opencl_kernel_call_implicitarg_ptr_func:
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; GCN: enable_sgpr_kernarg_segment_ptr = 1
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; HSA: kernarg_segment_byte_size = 160
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; HSA: kernarg_segment_alignment = 4
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; MESA: kernarg_segment_byte_size = 128
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; MESA: kernarg_segment_alignment = 4
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; GCN: s_add_u32 s8, s4, 0x70
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; GCN: s_addc_u32 s9, s5, 0{{$}}
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; GCN: s_swappc_b64
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define amdgpu_kernel void @opencl_kernel_call_implicitarg_ptr_func([112 x i8]) #1 {
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call void @func_implicitarg_ptr()
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ret void
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}
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; GCN-LABEL: {{^}}func_call_implicitarg_ptr_func:
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; GCN-NOT: s8
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; GCN-NOT: s9
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; GCN-NOT: s[8:9]
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; GCN: s_swappc_b64
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; GCN: s_setpc_b64 s[30:31]
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define void @func_call_implicitarg_ptr_func() #0 {
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call void @func_implicitarg_ptr()
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ret void
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}
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; GCN-LABEL: {{^}}opencl_func_call_implicitarg_ptr_func:
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; GCN-NOT: s8
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; GCN-NOT: s9
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; GCN-NOT: s[8:9]
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; GCN: s_swappc_b64
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; GCN: s_setpc_b64 s[30:31]
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define void @opencl_func_call_implicitarg_ptr_func() #0 {
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call void @func_implicitarg_ptr()
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ret void
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}
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; GCN-LABEL: {{^}}func_kernarg_implicitarg_ptr:
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; GCN: s_waitcnt
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; GCN-DAG: s_mov_b64 [[NULL:s\[[0-9]+:[0-9]+\]]], 0
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; GCN-DAG: s_load_dword s{{[0-9]+}}, [[NULL]], 0x0
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; GCN: s_load_dword s{{[0-9]+}}, s[8:9], 0x0
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; GCN: s_waitcnt lgkmcnt(0)
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define void @func_kernarg_implicitarg_ptr() #0 {
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%kernarg.segment.ptr = call i8 addrspace(4)* @llvm.amdgcn.kernarg.segment.ptr()
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast.kernarg.segment.ptr = bitcast i8 addrspace(4)* %kernarg.segment.ptr to i32 addrspace(4)*
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%cast.implicitarg = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load0 = load volatile i32, i32 addrspace(4)* %cast.kernarg.segment.ptr
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%load1 = load volatile i32, i32 addrspace(4)* %cast.implicitarg
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ret void
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}
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; GCN-LABEL: {{^}}opencl_func_kernarg_implicitarg_ptr:
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; GCN: s_waitcnt
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; GCN-DAG: s_mov_b64 [[NULL:s\[[0-9]+:[0-9]+\]]], 0
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; GCN-DAG: s_load_dword s{{[0-9]+}}, [[NULL]], 0x0
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; GCN: s_load_dword s{{[0-9]+}}, s[8:9], 0x0
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; GCN: s_waitcnt lgkmcnt(0)
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define void @opencl_func_kernarg_implicitarg_ptr() #0 {
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%kernarg.segment.ptr = call i8 addrspace(4)* @llvm.amdgcn.kernarg.segment.ptr()
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast.kernarg.segment.ptr = bitcast i8 addrspace(4)* %kernarg.segment.ptr to i32 addrspace(4)*
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%cast.implicitarg = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load0 = load volatile i32, i32 addrspace(4)* %cast.kernarg.segment.ptr
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%load1 = load volatile i32, i32 addrspace(4)* %cast.implicitarg
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ret void
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}
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; GCN-LABEL: {{^}}kernel_call_kernarg_implicitarg_ptr_func:
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; GCN: s_add_u32 s8, s4, 0x70
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; GCN: s_addc_u32 s9, s5, 0
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; GCN: s_swappc_b64
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define amdgpu_kernel void @kernel_call_kernarg_implicitarg_ptr_func([112 x i8]) #0 {
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call void @func_kernarg_implicitarg_ptr()
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ret void
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}
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; GCN-LABEL: {{^}}kernel_implicitarg_no_struct_align_padding:
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; HSA: kernarg_segment_byte_size = 120
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; MESA: kernarg_segment_byte_size = 84
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; GCN: kernarg_segment_alignment = 6
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define amdgpu_kernel void @kernel_implicitarg_no_struct_align_padding(<16 x i32>, i32) #1 {
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%implicitarg.ptr = call i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr()
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%cast = bitcast i8 addrspace(4)* %implicitarg.ptr to i32 addrspace(4)*
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%load = load volatile i32, i32 addrspace(4)* %cast
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ret void
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}
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; HSA-LABEL: Kernels:
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; HSA-LABEL: - Name: kernel_implicitarg_ptr_empty
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; HSA: CodeProps:
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; HSA: KernargSegmentSize: 56
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; HSA: KernargSegmentAlign: 8
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; HSA-LABEL: - Name: kernel_implicitarg_ptr_empty_0implicit
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; HSA: KernargSegmentSize: 0
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; HSA: KernargSegmentAlign: 4
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; HSA-LABEL: - Name: opencl_kernel_implicitarg_ptr_empty
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; HSA: KernargSegmentSize: 48
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; HSA: KernargSegmentAlign: 8
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; HSA-LABEL: - Name: kernel_implicitarg_ptr
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; HSA: KernargSegmentSize: 168
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; HSA: KernargSegmentAlign: 8
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; HSA-LABEL: - Name: opencl_kernel_implicitarg_ptr
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; HSA: KernargSegmentSize: 160
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; HSA: KernargSegmentAlign: 8
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; HSA-LABEL: - Name: kernel_call_implicitarg_ptr_func_empty
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; HSA: KernargSegmentSize: 56
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; HSA: KernargSegmentAlign: 8
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; HSA-LABEL: - Name: kernel_call_implicitarg_ptr_func_empty_implicit0
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; HSA: KernargSegmentSize: 0
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; HSA: KernargSegmentAlign: 4
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; HSA-LABEL: - Name: opencl_kernel_call_implicitarg_ptr_func_empty
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; HSA: KernargSegmentSize: 48
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; HSA: KernargSegmentAlign: 8
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; HSA-LABEL: - Name: kernel_call_implicitarg_ptr_func
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; HSA: KernargSegmentSize: 168
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; HSA: KernargSegmentAlign: 8
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; HSA-LABEL: - Name: opencl_kernel_call_implicitarg_ptr_func
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; HSA: KernargSegmentSize: 160
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; HSA: KernargSegmentAlign: 8
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; HSA-LABEL: - Name: kernel_call_kernarg_implicitarg_ptr_func
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; HSA: KernargSegmentSize: 168
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; HSA: KernargSegmentAlign: 8
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; HSA-LABEL: - Name: kernel_implicitarg_no_struct_align_padding
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; HSA: KernargSegmentSize: 120
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; HSA: KernargSegmentAlign: 64
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declare i8 addrspace(4)* @llvm.amdgcn.implicitarg.ptr() #2
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declare i8 addrspace(4)* @llvm.amdgcn.kernarg.segment.ptr() #2
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attributes #0 = { nounwind noinline }
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attributes #1 = { nounwind noinline "amdgpu-implicitarg-num-bytes"="48" }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { nounwind noinline "amdgpu-implicitarg-num-bytes"="0" }
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