llvm-project/llvm/test/CodeGen/AMDGPU/private-access-no-objects.ll
Matt Arsenault 08906a3c62 AMDGPU: Fix using incorrect private resource with no allocation
It's possible to have a use of the private resource descriptor or
scratch wave offset registers even though there are no allocated
stack objects. This would result in continuing to use the maximum
number reserved registers. This could go over the number of SGPRs
available on VI, or violate the SGPR limit requested by
the function attributes.

llvm-svn: 285435
2016-10-28 19:43:31 +00:00

57 lines
2.7 KiB
LLVM

; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=fiji -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=VI -check-prefix=OPT %s
; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=hawaii -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=CI -check-prefix=OPT %s
; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=iceland -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=VI -check-prefix=OPT %s
; RUN: llc -O0 -mtriple=amdgcn--amdhsa -mcpu=fiji -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=OPTNONE %s
; There are no stack objects, but still a private memory access. The
; private access regiters need to be correctly initialized anyway, and
; shifted down to the end of the used registers.
; GCN-LABEL: {{^}}store_to_undef:
; OPT-DAG: s_mov_b64 s{{\[}}[[RSRC_LO:[0-9]+]]:{{[0-9]+\]}}, s[0:1]
; OPT-DAG: s_mov_b64 s{{\[[0-9]+}}:[[RSRC_HI:[0-9]+]]{{\]}}, s[2:3]
; OPT-DAG: s_mov_b32 [[SOFFSET:s[0-9]+]], s7{{$}}
; OPT: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s{{\[}}[[RSRC_LO]]:[[RSRC_HI]]{{\]}}, [[SOFFSET]] offen{{$}}
; -O0 should assume spilling, so the input scratch resource descriptor
; -should be used directly without any copies.
; OPTNONE-NOT: s_mov_b32
; OPTNONE: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[0:3], s7 offen{{$}}
define void @store_to_undef() #0 {
store volatile i32 0, i32* undef
ret void
}
; GCN-LABEL: {{^}}store_to_inttoptr:
; OPT-DAG: s_mov_b64 s{{\[}}[[RSRC_LO:[0-9]+]]:{{[0-9]+\]}}, s[0:1]
; OPT-DAG: s_mov_b64 s{{\[[0-9]+}}:[[RSRC_HI:[0-9]+]]{{\]}}, s[2:3]
; OPT-DAG: s_mov_b32 [[SOFFSET:s[0-9]+]], s7{{$}}
; OPT: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s{{\[}}[[RSRC_LO]]:[[RSRC_HI]]{{\]}}, [[SOFFSET]] offen{{$}}
define void @store_to_inttoptr() #0 {
store volatile i32 0, i32* inttoptr (i32 123 to i32*)
ret void
}
; GCN-LABEL: {{^}}load_from_undef:
; OPT-DAG: s_mov_b64 s{{\[}}[[RSRC_LO:[0-9]+]]:{{[0-9]+\]}}, s[0:1]
; OPT-DAG: s_mov_b64 s{{\[[0-9]+}}:[[RSRC_HI:[0-9]+]]{{\]}}, s[2:3]
; OPT-DAG: s_mov_b32 [[SOFFSET:s[0-9]+]], s7{{$}}
; OPT: buffer_load_dword v{{[0-9]+}}, v{{[0-9]+}}, s{{\[}}[[RSRC_LO]]:[[RSRC_HI]]{{\]}}, [[SOFFSET]] offen{{$}}
define void @load_from_undef() #0 {
%ld = load volatile i32, i32* undef
ret void
}
; GCN-LABEL: {{^}}load_from_inttoptr:
; OPT-DAG: s_mov_b64 s{{\[}}[[RSRC_LO:[0-9]+]]:{{[0-9]+\]}}, s[0:1]
; OPT-DAG: s_mov_b64 s{{\[[0-9]+}}:[[RSRC_HI:[0-9]+]]{{\]}}, s[2:3]
; OPT-DAG: s_mov_b32 [[SOFFSET:s[0-9]+]], s7{{$}}
; OPT: buffer_load_dword v{{[0-9]+}}, v{{[0-9]+}}, s{{\[}}[[RSRC_LO]]:[[RSRC_HI]]{{\]}}, [[SOFFSET]] offen{{$}}
define void @load_from_inttoptr() #0 {
%ld = load volatile i32, i32* inttoptr (i32 123 to i32*)
ret void
}
attributes #0 = { nounwind }