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llvm-project/llvm/test/CodeGen/AMDGPU/large-alloca-graphics.ll

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AMDGPU: Remove SIPrepareScratchRegs It does not work because of emergency stack slots. This pass was supposed to eliminate dummy registers for the spill instructions, but the register scavenger can introduce more during PrologEpilogInserter, so some would end up left behind if they were needed. The potential for spilling the scratch resource descriptor and offset register makes doing something like this overly complicated. Reserve registers to use for the resource descriptor and use them directly in eliminateFrameIndex. Also removes creating another scratch resource descriptor when directly selecting scratch MUBUF instructions. The choice of which registers are reserved is temporary. For now it attempts to pick the next available registers after the user and system SGPRs. llvm-svn: 254329
2015-12-01 05:15:53 +08:00
; RUN: llc -march=amdgcn -mcpu=bonaire < %s | FileCheck -check-prefix=GCN -check-prefix=CI -check-prefix=ALL %s
AMDGPU/SI: Do not move scratch resource register on Tonga & Iceland Due to the SGPR init bug, every program claims to use the same number of SGPRs anyway, so there's no point in trying to shift those registers down from their initial spot of reservation. Add a test that uses VGPR spilling and blocks most SGPRs from being used for the scratch resource register. Previously, this would run into an assertion. Differential Revision: http://reviews.llvm.org/D15724 llvm-svn: 256870
2016-01-06 04:42:49 +08:00
; RUN: llc -march=amdgcn -mcpu=carrizo < %s | FileCheck -check-prefix=GCN -check-prefix=VI -check-prefix=ALL %s
AMDGPU: Remove SIPrepareScratchRegs It does not work because of emergency stack slots. This pass was supposed to eliminate dummy registers for the spill instructions, but the register scavenger can introduce more during PrologEpilogInserter, so some would end up left behind if they were needed. The potential for spilling the scratch resource descriptor and offset register makes doing something like this overly complicated. Reserve registers to use for the resource descriptor and use them directly in eliminateFrameIndex. Also removes creating another scratch resource descriptor when directly selecting scratch MUBUF instructions. The choice of which registers are reserved is temporary. For now it attempts to pick the next available registers after the user and system SGPRs. llvm-svn: 254329
2015-12-01 05:15:53 +08:00
; ALL-LABEL: {{^}}large_alloca_pixel_shader:
; GCN: s_mov_b32 s8, SCRATCH_RSRC_DWORD0
; GCN: s_mov_b32 s9, SCRATCH_RSRC_DWORD1
; GCN: s_mov_b32 s10, -1
AMDGPU: Set element_size in private resource descriptor Introduce a subtarget feature for this, and leave the default with the current behavior which assumes up to 16-byte loads/stores can be used. The field also seems to have the ability to be set to 2 bytes, but I'm not sure what that would be used for. llvm-svn: 260651
2016-02-12 10:40:47 +08:00
; CI: s_mov_b32 s11, 0x98f000
; VI: s_mov_b32 s11, 0x980000
AMDGPU: Remove SIPrepareScratchRegs It does not work because of emergency stack slots. This pass was supposed to eliminate dummy registers for the spill instructions, but the register scavenger can introduce more during PrologEpilogInserter, so some would end up left behind if they were needed. The potential for spilling the scratch resource descriptor and offset register makes doing something like this overly complicated. Reserve registers to use for the resource descriptor and use them directly in eliminateFrameIndex. Also removes creating another scratch resource descriptor when directly selecting scratch MUBUF instructions. The choice of which registers are reserved is temporary. For now it attempts to pick the next available registers after the user and system SGPRs. llvm-svn: 254329
2015-12-01 05:15:53 +08:00
AMDGPU: Rework how private buffer passed for HSA If we know we have stack objects, we reserve the registers that the private buffer resource and wave offset are passed and use them directly. If not, reserve the last 5 SGPRs just in case we need to spill. After register allocation, try to pick the next available registers instead of the last SGPRs, and then insert copies from the inputs to the reserved registers in the progloue. This also only selectively enables all of the input registers which are really required instead of always enabling them. llvm-svn: 254331
2015-12-01 05:16:03 +08:00
; GCN: buffer_store_dword {{v[0-9]+}}, {{v[0-9]+}}, s[8:11], s1 offen
; GCN: buffer_load_dword {{v[0-9]+}}, {{v[0-9]+}}, s[8:11], s1 offen
AMDGPU: Remove SIPrepareScratchRegs It does not work because of emergency stack slots. This pass was supposed to eliminate dummy registers for the spill instructions, but the register scavenger can introduce more during PrologEpilogInserter, so some would end up left behind if they were needed. The potential for spilling the scratch resource descriptor and offset register makes doing something like this overly complicated. Reserve registers to use for the resource descriptor and use them directly in eliminateFrameIndex. Also removes creating another scratch resource descriptor when directly selecting scratch MUBUF instructions. The choice of which registers are reserved is temporary. For now it attempts to pick the next available registers after the user and system SGPRs. llvm-svn: 254329
2015-12-01 05:15:53 +08:00
; ALL: ; ScratchSize: 32772
define void @large_alloca_pixel_shader(i32 %x, i32 %y) #1 {
%large = alloca [8192 x i32], align 4
%gep = getelementptr [8192 x i32], [8192 x i32]* %large, i32 0, i32 8191
store volatile i32 %x, i32* %gep
%gep1 = getelementptr [8192 x i32], [8192 x i32]* %large, i32 0, i32 %y
%val = load volatile i32, i32* %gep1
store volatile i32 %val, i32 addrspace(1)* undef
ret void
}
; ALL-LABEL: {{^}}large_alloca_pixel_shader_inreg:
; GCN: s_mov_b32 s8, SCRATCH_RSRC_DWORD0
; GCN: s_mov_b32 s9, SCRATCH_RSRC_DWORD1
; GCN: s_mov_b32 s10, -1
AMDGPU: Set element_size in private resource descriptor Introduce a subtarget feature for this, and leave the default with the current behavior which assumes up to 16-byte loads/stores can be used. The field also seems to have the ability to be set to 2 bytes, but I'm not sure what that would be used for. llvm-svn: 260651
2016-02-12 10:40:47 +08:00
; CI: s_mov_b32 s11, 0x98f000
; VI: s_mov_b32 s11, 0x980000
AMDGPU: Remove SIPrepareScratchRegs It does not work because of emergency stack slots. This pass was supposed to eliminate dummy registers for the spill instructions, but the register scavenger can introduce more during PrologEpilogInserter, so some would end up left behind if they were needed. The potential for spilling the scratch resource descriptor and offset register makes doing something like this overly complicated. Reserve registers to use for the resource descriptor and use them directly in eliminateFrameIndex. Also removes creating another scratch resource descriptor when directly selecting scratch MUBUF instructions. The choice of which registers are reserved is temporary. For now it attempts to pick the next available registers after the user and system SGPRs. llvm-svn: 254329
2015-12-01 05:15:53 +08:00
AMDGPU: Rework how private buffer passed for HSA If we know we have stack objects, we reserve the registers that the private buffer resource and wave offset are passed and use them directly. If not, reserve the last 5 SGPRs just in case we need to spill. After register allocation, try to pick the next available registers instead of the last SGPRs, and then insert copies from the inputs to the reserved registers in the progloue. This also only selectively enables all of the input registers which are really required instead of always enabling them. llvm-svn: 254331
2015-12-01 05:16:03 +08:00
; GCN: buffer_store_dword {{v[0-9]+}}, {{v[0-9]+}}, s[8:11], s1 offen
; GCN: buffer_load_dword {{v[0-9]+}}, {{v[0-9]+}}, s[8:11], s1 offen
AMDGPU: Remove SIPrepareScratchRegs It does not work because of emergency stack slots. This pass was supposed to eliminate dummy registers for the spill instructions, but the register scavenger can introduce more during PrologEpilogInserter, so some would end up left behind if they were needed. The potential for spilling the scratch resource descriptor and offset register makes doing something like this overly complicated. Reserve registers to use for the resource descriptor and use them directly in eliminateFrameIndex. Also removes creating another scratch resource descriptor when directly selecting scratch MUBUF instructions. The choice of which registers are reserved is temporary. For now it attempts to pick the next available registers after the user and system SGPRs. llvm-svn: 254329
2015-12-01 05:15:53 +08:00
; ALL: ; ScratchSize: 32772
define void @large_alloca_pixel_shader_inreg(i32 inreg %x, i32 inreg %y) #1 {
%large = alloca [8192 x i32], align 4
%gep = getelementptr [8192 x i32], [8192 x i32]* %large, i32 0, i32 8191
store volatile i32 %x, i32* %gep
%gep1 = getelementptr [8192 x i32], [8192 x i32]* %large, i32 0, i32 %y
%val = load volatile i32, i32* %gep1
store volatile i32 %val, i32 addrspace(1)* undef
ret void
}
attributes #0 = { nounwind }
attributes #1 = { nounwind "ShaderType"="0" }