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R600/SI: Add kill flag when copying scratch offset to a register

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This allows us to re-use the same register for the scratch offset
when accessing large private arrays.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226585 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2015-01-20 17:49:45 +00:00
parent a978a481bb
commit ad7a884efe
2 changed files with 8 additions and 3 deletions
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2
lib/Target/R600/SIRegisterInfo.cpp
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@ -289,7 +289,7 @@ void SIRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator MI,
BuildMI(*MBB, MI, MI->getDebugLoc(),
TII->get(AMDGPU::V_MOV_B32_e32), TmpReg)
.addImm(Offset);
FIOp.ChangeToRegister(TmpReg, false);
FIOp.ChangeToRegister(TmpReg, false, false, true);
}
}
}

9
test/CodeGen/R600/scratch-buffer.ll
View File

@ -3,9 +3,14 @@
; When a frame index offset is more than 12-bits, make sure we don't store
; it in mubuf's offset field.
; Also, make sure we use the same register for storing the scratch buffer addresss
; 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: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen
; CHECK: v_mov_b32_e32 [[OFFSET:v[0-9]+]], 0x8000
; CHECK: v_mov_b32_e32 [[OFFSET:v[0-9]+]], 0{{$}}
; CHECK: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen
; CHECK: v_mov_b32_e32 [[OFFSET]], 0x8000
; CHECK: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen{{$}}
define void @legal_offset_fi(i32 addrspace(1)* %out, i32 %cond, i32 %if_offset, i32 %else_offset) {