[PATCH] D78664: [AMDGPU] Add the SGPR used for FP copy to block livein lists.
Christudasan Devadasan via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Apr 23 01:02:23 PDT 2020
cdevadas updated this revision to Diff 259492.
cdevadas added a comment.
Added a small description of the test.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D78664/new/
https://reviews.llvm.org/D78664
Files:
llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
llvm/test/CodeGen/AMDGPU/fix-frame-ptr-reg-copy-livein.ll
Index: llvm/test/CodeGen/AMDGPU/fix-frame-ptr-reg-copy-livein.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/AMDGPU/fix-frame-ptr-reg-copy-livein.ll
@@ -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" }
Index: llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
===================================================================
--- llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
+++ llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
@@ -614,6 +614,9 @@
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
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