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llvm-project/llvm/test/CodeGen/AMDGPU/spill-offset-calculation.ll

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; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -enable-misched=0 -post-RA-scheduler=0 -stress-regalloc=8 < %s | FileCheck -check-prefixes=GCN,MUBUF %s
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -enable-misched=0 -post-RA-scheduler=0 -stress-regalloc=8 -amdgpu-enable-flat-scratch < %s | FileCheck -check-prefixes=GCN,FLATSCR %s
; Test that the VGPR spiller correctly switches to SGPR offsets when the
; instruction offset field would overflow, and that it accounts for memory
; swizzling.
; GCN-LABEL: test_inst_offset_kernel
define amdgpu_kernel void @test_inst_offset_kernel() {
entry:
; Occupy 4092 bytes of scratch, so the offset of the spill of %a just fits in
; the instruction offset field.
%alloca = alloca i8, i32 4088, align 4, addrspace(5)
%buf = bitcast i8 addrspace(5)* %alloca to i32 addrspace(5)*
%aptr = getelementptr i32, i32 addrspace(5)* %buf, i32 1
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], 0 offset:4092 ; 4-byte Folded Spill
; FLATSCR: scratch_store_dword off, v{{[0-9]+}}, s{{[0-9]+}} ; 4-byte Folded Spill
%a = load volatile i32, i32 addrspace(5)* %aptr
; Force %a to spill.
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}" ()
%outptr = getelementptr i32, i32 addrspace(5)* %buf, i32 1
store volatile i32 %a, i32 addrspace(5)* %outptr
ret void
}
; GCN-LABEL: test_sgpr_offset_kernel
define amdgpu_kernel void @test_sgpr_offset_kernel() {
entry:
; Occupy 4096 bytes of scratch, so the offset of the spill of %a does not
; fit in the instruction, and has to live in the SGPR offset.
%alloca = alloca i8, i32 4092, align 4, addrspace(5)
%buf = bitcast i8 addrspace(5)* %alloca to i32 addrspace(5)*
%aptr = getelementptr i32, i32 addrspace(5)* %buf, i32 1
; 0x40000 / 64 = 4096 (for wave64)
; MUBUF: s_mov_b32 s6, 0x40000
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s6 ; 4-byte Folded Spill
; FLATSCR: s_movk_i32 s2, 0x1000
; FLATSCR: scratch_store_dword off, v{{[0-9]+}}, s2 ; 4-byte Folded Spill
%a = load volatile i32, i32 addrspace(5)* %aptr
; Force %a to spill
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}" ()
%outptr = getelementptr i32, i32 addrspace(5)* %buf, i32 1
store volatile i32 %a, i32 addrspace(5)* %outptr
ret void
}
; FIXME: If we fail to scavenge an SGPR in a kernel we don't have a stack
; pointer to temporarily update, so we just crash.
; GCN-LABEL: test_sgpr_offset_function_scavenge_fail
define void @test_sgpr_offset_function_scavenge_fail() #2 {
entry:
; Occupy 4096 bytes of scratch, so the offset of the spill of %a does not
; fit in the instruction, and has to live in the SGPR offset.
%alloca = alloca i8, i32 4096, align 4, addrspace(5)
%buf = bitcast i8 addrspace(5)* %alloca to i32 addrspace(5)*
%aptr = getelementptr i32, i32 addrspace(5)* %buf, i32 1
%asm.0 = call { i32, i32, i32, i32, i32, i32, i32, i32 } asm sideeffect "", "=s,=s,=s,=s,=s,=s,=s,=s"()
%asm0.0 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm.0, 0
%asm1.0 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm.0, 1
%asm2.0 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm.0, 2
%asm3.0 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm.0, 3
%asm4.0 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm.0, 4
%asm5.0 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm.0, 5
%asm6.0 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm.0, 6
%asm7.0 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm.0, 7
; 0x40000 / 64 = 4096 (for wave64)
%a = load volatile i32, i32 addrspace(5)* %aptr
; MUBUF: s_add_u32 s32, s32, 0x40000
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s32 ; 4-byte Folded Spill
; MUBUF: s_sub_u32 s32, s32, 0x40000
; FLATSCR: s_add_u32 [[SOFF:s[0-9]+]], s32, 0x1000
; FLATSCR: scratch_store_dword off, v{{[0-9]+}}, [[SOFF]] ; 4-byte Folded Spill
call void asm sideeffect "", "s,s,s,s,s,s,s,s,v"(i32 %asm0.0, i32 %asm1.0, i32 %asm2.0, i32 %asm3.0, i32 %asm4.0, i32 %asm5.0, i32 %asm6.0, i32 %asm7.0, i32 %a)
%asm = call { i32, i32, i32, i32, i32, i32, i32, i32 } asm sideeffect "", "=s,=s,=s,=s,=s,=s,=s,=s"()
%asm0 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm, 0
%asm1 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm, 1
%asm2 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm, 2
%asm3 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm, 3
%asm4 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm, 4
%asm5 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm, 5
%asm6 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm, 6
%asm7 = extractvalue { i32, i32, i32, i32, i32, i32, i32, i32 } %asm, 7
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}"() #0
; MUBUF: s_add_u32 s32, s32, 0x40000
; MUBUF: buffer_load_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s32 ; 4-byte Folded Reload
; MUBUF: s_sub_u32 s32, s32, 0x40000
; FLATSCR: s_add_u32 [[SOFF:s[0-9]+]], s32, 0x1000
; FLATSCR: scratch_load_dword v{{[0-9]+}}, off, [[SOFF]] ; 4-byte Folded Reload
; Force %a to spill with no free SGPRs
call void asm sideeffect "", "s,s,s,s,s,s,s,s,v"(i32 %asm0, i32 %asm1, i32 %asm2, i32 %asm3, i32 %asm4, i32 %asm5, i32 %asm6, i32 %asm7, i32 %a)
ret void
}
; GCN-LABEL: test_sgpr_offset_subregs_kernel
define amdgpu_kernel void @test_sgpr_offset_subregs_kernel() {
entry:
; Occupy 4088 bytes of scratch, so that the spill of the last subreg of %a
; still fits below offset 4096 (4088 + 8 - 4 = 4092), and can be placed in
; the instruction offset field.
%alloca = alloca i8, i32 4084, align 4, addrspace(5)
%bufv1 = bitcast i8 addrspace(5)* %alloca to i32 addrspace(5)*
%bufv2 = bitcast i8 addrspace(5)* %alloca to <2 x i32> addrspace(5)*
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], 0 offset:4088 ; 4-byte Folded Spill
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], 0 offset:4092 ; 4-byte Folded Spill
; FLATSCR: s_movk_i32 [[SOFF:s[0-9]+]], 0xff8
; FLATSCR: scratch_store_dwordx2 off, v[{{[0-9:]+}}], [[SOFF]] ; 8-byte Folded Spill
%aptr = getelementptr <2 x i32>, <2 x i32> addrspace(5)* %bufv2, i32 1
%a = load volatile <2 x i32>, <2 x i32> addrspace(5)* %aptr
; Force %a to spill.
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}" ()
; Ensure the alloca sticks around.
%bptr = getelementptr i32, i32 addrspace(5)* %bufv1, i32 1
%b = load volatile i32, i32 addrspace(5)* %bptr
; Ensure the spill is of the full super-reg.
call void asm sideeffect "; $0", "r"(<2 x i32> %a)
ret void
}
; GCN-LABEL: test_inst_offset_subregs_kernel
define amdgpu_kernel void @test_inst_offset_subregs_kernel() {
entry:
; Occupy 4092 bytes of scratch, so that the spill of the last subreg of %a
; does not fit below offset 4096 (4092 + 8 - 4 = 4096), and has to live
; in the SGPR offset.
%alloca = alloca i8, i32 4088, align 4, addrspace(5)
%bufv1 = bitcast i8 addrspace(5)* %alloca to i32 addrspace(5)*
%bufv2 = bitcast i8 addrspace(5)* %alloca to <2 x i32> addrspace(5)*
; 0x3ff00 / 64 = 4092 (for wave64)
; MUBUF: s_mov_b32 s6, 0x3ff00
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s6 ; 4-byte Folded Spill
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s6 offset:4 ; 4-byte Folded Spill
; FLATSCR: s_movk_i32 [[SOFF:s[0-9]+]], 0xffc
; FLATSCR: scratch_store_dwordx2 off, v[{{[0-9:]+}}], [[SOFF]] ; 8-byte Folded Spill
%aptr = getelementptr <2 x i32>, <2 x i32> addrspace(5)* %bufv2, i32 1
%a = load volatile <2 x i32>, <2 x i32> addrspace(5)* %aptr
; Force %a to spill.
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}" ()
; Ensure the alloca sticks around.
%bptr = getelementptr i32, i32 addrspace(5)* %bufv1, i32 1
%b = load volatile i32, i32 addrspace(5)* %bptr
; Ensure the spill is of the full super-reg.
call void asm sideeffect "; $0", "r"(<2 x i32> %a)
ret void
}
; GCN-LABEL: test_inst_offset_function
define void @test_inst_offset_function() {
entry:
; Occupy 4092 bytes of scratch, so the offset of the spill of %a just fits in
; the instruction offset field.
%alloca = alloca i8, i32 4092, align 4, addrspace(5)
%buf = bitcast i8 addrspace(5)* %alloca to i32 addrspace(5)*
%aptr = getelementptr i32, i32 addrspace(5)* %buf, i32 1
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offset:4092 ; 4-byte Folded Spill
; FLATSCR: scratch_store_dword off, v{{[0-9]+}}, s{{[0-9]+}} offset:4092 ; 4-byte Folded Spill
%a = load volatile i32, i32 addrspace(5)* %aptr
; Force %a to spill.
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}" ()
%outptr = getelementptr i32, i32 addrspace(5)* %buf, i32 1
store volatile i32 %a, i32 addrspace(5)* %outptr
ret void
}
; GCN-LABEL: test_sgpr_offset_function
define void @test_sgpr_offset_function() {
entry:
; Occupy 4096 bytes of scratch, so the offset of the spill of %a does not
; fit in the instruction, and has to live in the SGPR offset.
%alloca = alloca i8, i32 4096, align 4, addrspace(5)
%buf = bitcast i8 addrspace(5)* %alloca to i32 addrspace(5)*
%aptr = getelementptr i32, i32 addrspace(5)* %buf, i32 1
; 0x40000 / 64 = 4096 (for wave64)
; MUBUF: s_add_u32 s4, s32, 0x40000
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s4 ; 4-byte Folded Spill
; FLATSCR: s_add_u32 s0, s32, 0x1000
; FLATSCR: scratch_store_dword off, v{{[0-9]+}}, s0 ; 4-byte Folded Spill
%a = load volatile i32, i32 addrspace(5)* %aptr
; Force %a to spill
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}" ()
%outptr = getelementptr i32, i32 addrspace(5)* %buf, i32 1
store volatile i32 %a, i32 addrspace(5)* %outptr
ret void
}
; GCN-LABEL: test_sgpr_offset_subregs_function
define void @test_sgpr_offset_subregs_function() {
entry:
; Occupy 4088 bytes of scratch, so that the spill of the last subreg of %a
; still fits below offset 4096 (4088 + 8 - 4 = 4092), and can be placed in
; the instruction offset field.
%alloca = alloca i8, i32 4088, align 4, addrspace(5)
%bufv1 = bitcast i8 addrspace(5)* %alloca to i32 addrspace(5)*
%bufv2 = bitcast i8 addrspace(5)* %alloca to <2 x i32> addrspace(5)*
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offset:4088 ; 4-byte Folded Spill
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offset:4092 ; 4-byte Folded Spill
; FLATSCR: scratch_store_dwordx2 off, v[{{[0-9:]+}}], s32 offset:4088 ; 8-byte Folded Spill
%aptr = getelementptr <2 x i32>, <2 x i32> addrspace(5)* %bufv2, i32 1
%a = load volatile <2 x i32>, <2 x i32> addrspace(5)* %aptr
; Force %a to spill.
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}" ()
; Ensure the alloca sticks around.
%bptr = getelementptr i32, i32 addrspace(5)* %bufv1, i32 1
%b = load volatile i32, i32 addrspace(5)* %bptr
; Ensure the spill is of the full super-reg.
call void asm sideeffect "; $0", "r"(<2 x i32> %a)
ret void
}
; GCN-LABEL: test_inst_offset_subregs_function
define void @test_inst_offset_subregs_function() {
entry:
; Occupy 4092 bytes of scratch, so that the spill of the last subreg of %a
; does not fit below offset 4096 (4092 + 8 - 4 = 4096), and has to live
; in the SGPR offset.
%alloca = alloca i8, i32 4092, align 4, addrspace(5)
%bufv1 = bitcast i8 addrspace(5)* %alloca to i32 addrspace(5)*
%bufv2 = bitcast i8 addrspace(5)* %alloca to <2 x i32> addrspace(5)*
; 0x3ff00 / 64 = 4092 (for wave64)
; MUBUF: s_add_u32 s4, s32, 0x3ff00
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s4 ; 4-byte Folded Spill
; MUBUF: buffer_store_dword v{{[0-9]+}}, off, s[{{[0-9]+:[0-9]+}}], s4 offset:4 ; 4-byte Folded Spill
; FLATSCR: scratch_store_dwordx2 off, v[{{[0-9:]+}}], s32 offset:4092 ; 8-byte Folded Spill
%aptr = getelementptr <2 x i32>, <2 x i32> addrspace(5)* %bufv2, i32 1
%a = load volatile <2 x i32>, <2 x i32> addrspace(5)* %aptr
; Force %a to spill.
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}" ()
; Ensure the alloca sticks around.
%bptr = getelementptr i32, i32 addrspace(5)* %bufv1, i32 1
%b = load volatile i32, i32 addrspace(5)* %bptr
; Ensure the spill is of the full super-reg.
call void asm sideeffect "; $0", "r"(<2 x i32> %a)
ret void
}
attributes #0 = { nounwind }
attributes #1 = { nounwind "amdgpu-num-sgpr"="17" "amdgpu-num-vgpr"="8" }
attributes #2 = { nounwind "amdgpu-num-sgpr"="14" "amdgpu-num-vgpr"="8" }
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