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AMDPGU/SI: Negative offsets aren't allowed in MUBUF's vaddr operand

Browse Source 
Reviewers: arsenm

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11226

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242434 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2015-07-16 19:40:09 +00:00
parent cac05d9b58
commit 104dab3e04
3 changed files with 50 additions and 18 deletions
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15
lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
View File

@ -1095,13 +1095,16 @@ bool AMDGPUDAGToDAGISel::SelectMUBUFScratch(SDValue Addr, SDValue &Rsrc,
// (add n0, c1)
if (CurDAG->isBaseWithConstantOffset(Addr)) {
SDValue N0 = Addr.getOperand(0);
SDValue N1 = Addr.getOperand(1);
ConstantSDNode *C1 = cast<ConstantSDNode>(N1);
if (isLegalMUBUFImmOffset(C1)) {
VAddr = Addr.getOperand(0);
ImmOffset = CurDAG->getTargetConstant(C1->getZExtValue(), DL, MVT::i16);
return true;
// Offsets in vaddr must be positive.
if (CurDAG->SignBitIsZero(N0)) {
ConstantSDNode *C1 = cast<ConstantSDNode>(N1);
if (isLegalMUBUFImmOffset(C1)) {
VAddr = N0;
ImmOffset = CurDAG->getTargetConstant(C1->getZExtValue(), DL, MVT::i16);
return true;
}
}
}

2
test/CodeGen/AMDGPU/private-memory.ll
View File

@ -298,7 +298,7 @@ entry:
; FUNC-LABEL: ptrtoint:
; SI-NOT: ds_write
; SI: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offen
; SI: buffer_load_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offen offset:5
; SI: buffer_load_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offen ;
define void @ptrtoint(i32 addrspace(1)* %out, i32 %a, i32 %b) {
%alloca = alloca [16 x i32]
%tmp0 = getelementptr [16 x i32], [16 x i32]* %alloca, i32 0, i32 %a

51
test/CodeGen/AMDGPU/scratch-buffer.ll
View File

@ -1,5 +1,7 @@
; RUN: llc -verify-machineinstrs -march=amdgcn -mcpu=SI < %s | FileCheck %s
; RUN: llc -verify-machineinstrs -march=amdgcn -mcpu=tonga < %s | FileCheck %s
; RUN: llc -verify-machineinstrs -march=amdgcn -mcpu=SI < %s | FileCheck --check-prefix=GCN --check-prefix=DEFAULT-SCRATCH %s
; RUN: llc -verify-machineinstrs -march=amdgcn -mcpu=tonga < %s | FileCheck --check-prefix=GCN --check-prefix=DEFAULT-SCRATCH %s
; RUN: llc -verify-machineinstrs -march=amdgcn -mattr=+huge-scratch-buffer -mcpu=SI < %s | FileCheck --check-prefix=GCN --check-prefix=HUGE-SCRATCH %s
; RUN: llc -verify-machineinstrs -march=amdgcn -mattr=+huge-scratch-buffer -mcpu=tonga < %s | FileCheck --check-prefix=GCN --check-prefix=HUGE-SCRATCH %s
; When a frame index offset is more than 12-bits, make sure we don't store
; it in mubuf's offset field.
@ -8,11 +10,11 @@
; for both stores. This register is allocated by the register scavenger, so we
; should be able to reuse the same regiser for each scratch buffer access.
; CHECK-LABEL: {{^}}legal_offset_fi:
; CHECK: v_mov_b32_e32 [[OFFSET:v[0-9]+]], 0{{$}}
; CHECK: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen
; CHECK: v_mov_b32_e32 [[OFFSET]], 0x8000
; CHECK: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen{{$}}
; GCN-LABEL: {{^}}legal_offset_fi:
; GCN: v_mov_b32_e32 [[OFFSET:v[0-9]+]], 0{{$}}
; GCN: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen
; GCN: v_mov_b32_e32 [[OFFSET]], 0x8000
; GCN: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen{{$}}
define void @legal_offset_fi(i32 addrspace(1)* %out, i32 %cond, i32 %if_offset, i32 %else_offset) {
entry:
@ -47,10 +49,10 @@ done:
}
; CHECK-LABEL: {{^}}legal_offset_fi_offset
; CHECK: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen
; CHECK: v_add_i32_e32 [[OFFSET:v[0-9]+]], 0x8000
; CHECK: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen{{$}}
; GCN-LABEL: {{^}}legal_offset_fi_offset
; GCN: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen
; GCN: v_add_i32_e32 [[OFFSET:v[0-9]+]], 0x8000
; GCN: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen{{$}}
define void @legal_offset_fi_offset(i32 addrspace(1)* %out, i32 %cond, i32 addrspace(1)* %offsets, i32 %if_offset, i32 %else_offset) {
entry:
@ -85,3 +87,30 @@ done:
ret void
}
; GCN-LABEL: @neg_vaddr_offset
; We can't prove %offset is positive, so we must do the computation with the
; immediate in an add instruction instead of folding offset and the immediate into
; the store instruction.
; GCN: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offen{{$}}
define void @neg_vaddr_offset(i32 %offset) {
entry:
%array = alloca [8192 x i32]
%ptr_offset = add i32 %offset, 4
%ptr = getelementptr [8192 x i32], [8192 x i32]* %array, i32 0, i32 %ptr_offset
store i32 0, i32* %ptr
ret void
}
; GCN-LABEL: @pos_vaddr_offse
; DEFAULT-SCRATCH: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offen offset:16
; HUGE-SCRATCH: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offen{{$}}
define void @pos_vaddr_offset(i32 addrspace(1)* %out, i32 %offset) {
entry:
%array = alloca [8192 x i32]
%ptr = getelementptr [8192 x i32], [8192 x i32]* %array, i32 0, i32 4
store i32 0, i32* %ptr
%load_ptr = getelementptr [8192 x i32], [8192 x i32]* %array, i32 0, i32 %offset
%val = load i32, i32* %load_ptr
store i32 %val, i32 addrspace(1)* %out
ret void
}