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[AMDGPU] Add the SGPR used for FP copy to block livein lists. 

The temporary register used for FP copy
should be live throughout the function.
This commit is contained in:
Christudasan Devadasan 2020-04-23 00:50:45 +05:30
parent 10ff24d853
commit 207cd5f68f
2 changed files with 48 additions and 0 deletions
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3
llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
View File

@ -614,6 +614,9 @@ void SIFrameLowering::emitPrologue(MachineFunction &MF,
BuildMI(MBB, MBBI, DL, TII->get(AMDGPU::COPY), FuncInfo->SGPRForFPSaveRestoreCopy)
.addReg(FramePtrReg)
.setMIFlag(MachineInstr::FrameSetup);
// Make the register live throughout the function.
for (MachineBasicBlock &MBB : MF)
MBB.addLiveIn(FuncInfo->SGPRForFPSaveRestoreCopy);
}
for (const SIMachineFunctionInfo::SGPRSpillVGPRCSR &Reg

45
llvm/test/CodeGen/AMDGPU/fix-frame-ptr-reg-copy-livein.ll Normal file
View File

@ -0,0 +1,45 @@
; RUN: llc -march=amdgcn -mcpu=gfx900 -stop-after=prologepilog -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
; It is a small loop test that iterates over the array member of the structure argument passed byval to the function.
; The loop code will keep the prologue and epilogue blocks apart.
; The test is primarily to check the temp register used to preserve the earlier FP value
; is live-in at every BB in the function.
%struct.Data = type { [20 x i32] }
define i32 @fp_save_restore_in_temp_sgpr(%struct.Data addrspace(5)* nocapture readonly byval(%struct.Data) align 4 %arg) #0 {
; GCN-LABEL: name: fp_save_restore_in_temp_sgpr
; GCN: bb.0.begin:
; GCN: liveins: $sgpr30_sgpr31, $sgpr7
; GCN: $sgpr7 = frame-setup COPY $sgpr33
; GCN: $sgpr33 = frame-setup COPY $sgpr32
; GCN: bb.1.lp_end:
; GCN: liveins: $sgpr6, $vgpr1, $sgpr4_sgpr5, $sgpr8_sgpr9, $sgpr10_sgpr11, $sgpr30_sgpr31, $sgpr7
; GCN: bb.2.lp_begin:
; GCN: liveins: $sgpr6, $vgpr1, $sgpr4_sgpr5, $sgpr8_sgpr9, $sgpr30_sgpr31, $sgpr7
; GCN: bb.3.Flow:
; GCN: liveins: $sgpr6, $vgpr0, $vgpr1, $sgpr4_sgpr5, $sgpr8_sgpr9, $sgpr10_sgpr11, $sgpr30_sgpr31, $sgpr7
; GCN: bb.4.end:
; GCN: liveins: $vgpr0, $sgpr4_sgpr5, $sgpr30_sgpr31, $sgpr7
; GCN: $sgpr33 = frame-setup COPY $sgpr7
begin:
br label %lp_begin
lp_end: ; preds = %lp_begin
%cur_idx = add nuw nsw i32 %idx, 1
%lp_term_cond = icmp eq i32 %cur_idx, 20
br i1 %lp_term_cond, label %end, label %lp_begin
lp_begin: ; preds = %lp_end, %begin
%idx = phi i32 [ 0, %begin ], [ %cur_idx, %lp_end ]
%ptr = getelementptr inbounds %struct.Data, %struct.Data addrspace(5)* %arg, i32 0, i32 0, i32 %idx
%data = load i32, i32 addrspace(5)* %ptr, align 4
%data_cmp = icmp eq i32 %data, %idx
br i1 %data_cmp, label %lp_end, label %end
end: ; preds = %lp_end, %lp_begin
%ret_val = phi i32 [ 0, %lp_begin ], [ 1, %lp_end ]
ret i32 %ret_val
}
attributes #0 = { norecurse nounwind "frame-pointer"="all" }