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llvm-mirror/test/CodeGen/AMDGPU/waitcnt-vscnt.ll
Jay Foad 7c4d297102 [AMDGPU] Mark s_barrier as having side effects but not accessing memory. 
Summary:
This fixes poor scheduling in a function containing a barrier and a few
load instructions.

Without this fix, ScheduleDAGInstrs::buildSchedGraph adds an artificial
edge in the dependency graph from the barrier instruction to the exit
node representing live-out latency, with a latency of about 500 cycles.
Because of this it thinks the critical path through the graph also has
a latency of about 500 cycles. And because of that it does not think
that any of the load instructions are on the critical path, so it
schedules them with no regard for their (80 cycle) latency, which gives
poor results.

Reviewers: arsenm, dstuttard, tpr, nhaehnle

Subscribers: kzhuravl, jvesely, wdng, yaxunl, t-tye, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67218

llvm-svn: 371192
2019-09-06 10:07:28 +00:00

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; RUN: llc -march=amdgcn -mcpu=gfx802 -asm-verbose=0 -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX8,GFX8_9 %s
; RUN: llc -march=amdgcn -mcpu=gfx900 -asm-verbose=0 -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX9,GFX9_10,GFX8_9 %s
; RUN: llc -march=amdgcn -mcpu=gfx1010 -asm-verbose=0 -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX10,GFX9_10 %s
; GCN-LABEL: barrier_vmcnt_global:
; GFX8: flat_load_dword
; GFX9_10: global_load_dword
; GFX8: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GFX9_10: s_waitcnt vmcnt(0){{$}}
; GCN-NEXT: s_barrier
define amdgpu_kernel void @barrier_vmcnt_global(i32 addrspace(1)* %arg) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%tmp1 = zext i32 %tmp to i64
%tmp2 = shl nuw nsw i64 %tmp1, 32
%tmp3 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp1
%tmp4 = load i32, i32 addrspace(1)* %tmp3, align 4
fence syncscope("singlethread") release
tail call void @llvm.amdgcn.s.barrier()
fence syncscope("singlethread") acquire
%tmp5 = add nuw nsw i64 %tmp2, 4294967296
%tmp6 = lshr exact i64 %tmp5, 32
%tmp7 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp6
store i32 %tmp4, i32 addrspace(1)* %tmp7, align 4
ret void
}
; GCN-LABEL: barrier_vscnt_global:
; GFX8: flat_store_dword
; GFX9_10: global_store_dword
; GFX8: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GFX9: s_waitcnt vmcnt(0){{$}}
; GFX10: s_waitcnt_vscnt null, 0x0
; GCN-NEXT: s_barrier
define amdgpu_kernel void @barrier_vscnt_global(i32 addrspace(1)* %arg) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%tmp1 = zext i32 %tmp to i64
%tmp2 = shl nuw nsw i64 %tmp1, 32
%tmp3 = add nuw nsw i64 %tmp2, 8589934592
%tmp4 = lshr exact i64 %tmp3, 32
%tmp5 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp4
store i32 0, i32 addrspace(1)* %tmp5, align 4
fence syncscope("singlethread") release
tail call void @llvm.amdgcn.s.barrier() #3
fence syncscope("singlethread") acquire
%tmp6 = add nuw nsw i64 %tmp2, 4294967296
%tmp7 = lshr exact i64 %tmp6, 32
%tmp8 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp7
store i32 1, i32 addrspace(1)* %tmp8, align 4
ret void
}
; GCN-LABEL: barrier_vmcnt_vscnt_global:
; GFX8: flat_load_dword
; GFX9_10: global_load_dword
; GFX8: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GFX9_10: s_waitcnt vmcnt(0){{$}}
; GFX10: s_waitcnt_vscnt null, 0x0
; GCN-NEXT: s_barrier
define amdgpu_kernel void @barrier_vmcnt_vscnt_global(i32 addrspace(1)* %arg) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%tmp1 = zext i32 %tmp to i64
%tmp2 = shl nuw nsw i64 %tmp1, 32
%tmp3 = add nuw nsw i64 %tmp2, 8589934592
%tmp4 = lshr exact i64 %tmp3, 32
%tmp5 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp4
store i32 0, i32 addrspace(1)* %tmp5, align 4
%tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp1
%tmp7 = load i32, i32 addrspace(1)* %tmp6, align 4
fence syncscope("singlethread") release
tail call void @llvm.amdgcn.s.barrier()
fence syncscope("singlethread") acquire
%tmp8 = add nuw nsw i64 %tmp2, 4294967296
%tmp9 = lshr exact i64 %tmp8, 32
%tmp10 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp9
store i32 %tmp7, i32 addrspace(1)* %tmp10, align 4
ret void
}
; GCN-LABEL: barrier_vmcnt_flat:
; GCN: flat_load_dword
; GCN: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GCN-NEXT: s_barrier
define amdgpu_kernel void @barrier_vmcnt_flat(i32* %arg) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%tmp1 = zext i32 %tmp to i64
%tmp2 = shl nuw nsw i64 %tmp1, 32
%tmp3 = getelementptr inbounds i32, i32* %arg, i64 %tmp1
%tmp4 = load i32, i32* %tmp3, align 4
fence syncscope("singlethread") release
tail call void @llvm.amdgcn.s.barrier()
fence syncscope("singlethread") acquire
%tmp5 = add nuw nsw i64 %tmp2, 4294967296
%tmp6 = lshr exact i64 %tmp5, 32
%tmp7 = getelementptr inbounds i32, i32* %arg, i64 %tmp6
store i32 %tmp4, i32* %tmp7, align 4
ret void
}
; GCN-LABEL: barrier_vscnt_flat:
; GCN: flat_store_dword
; GFX8_9: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GFX10: s_waitcnt lgkmcnt(0){{$}}
; GFX10: s_waitcnt_vscnt null, 0x0
; GCN-NEXT: s_barrier
define amdgpu_kernel void @barrier_vscnt_flat(i32* %arg) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%tmp1 = zext i32 %tmp to i64
%tmp2 = shl nuw nsw i64 %tmp1, 32
%tmp3 = add nuw nsw i64 %tmp2, 8589934592
%tmp4 = lshr exact i64 %tmp3, 32
%tmp5 = getelementptr inbounds i32, i32* %arg, i64 %tmp4
store i32 0, i32* %tmp5, align 4
fence syncscope("singlethread") release
tail call void @llvm.amdgcn.s.barrier() #3
fence syncscope("singlethread") acquire
%tmp6 = add nuw nsw i64 %tmp2, 4294967296
%tmp7 = lshr exact i64 %tmp6, 32
%tmp8 = getelementptr inbounds i32, i32* %arg, i64 %tmp7
store i32 1, i32* %tmp8, align 4
ret void
}
; GCN-LABEL: barrier_vmcnt_vscnt_flat:
; GCN: flat_load_dword
; GCN: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GFX10: s_waitcnt_vscnt null, 0x0
; GCN-NEXT: s_barrier
define amdgpu_kernel void @barrier_vmcnt_vscnt_flat(i32* %arg) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%tmp1 = zext i32 %tmp to i64
%tmp2 = shl nuw nsw i64 %tmp1, 32
%tmp3 = add nuw nsw i64 %tmp2, 8589934592
%tmp4 = lshr exact i64 %tmp3, 32
%tmp5 = getelementptr inbounds i32, i32* %arg, i64 %tmp4
store i32 0, i32* %tmp5, align 4
%tmp6 = getelementptr inbounds i32, i32* %arg, i64 %tmp1
%tmp7 = load i32, i32* %tmp6, align 4
fence syncscope("singlethread") release
tail call void @llvm.amdgcn.s.barrier()
fence syncscope("singlethread") acquire
%tmp8 = add nuw nsw i64 %tmp2, 4294967296
%tmp9 = lshr exact i64 %tmp8, 32
%tmp10 = getelementptr inbounds i32, i32* %arg, i64 %tmp9
store i32 %tmp7, i32* %tmp10, align 4
ret void
}
; GCN-LABEL: barrier_vmcnt_vscnt_flat_workgroup:
; GCN: flat_load_dword
; GCN: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GFX10: s_waitcnt_vscnt null, 0x0
; GCN-NEXT: s_barrier
define amdgpu_kernel void @barrier_vmcnt_vscnt_flat_workgroup(i32* %arg) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%tmp1 = zext i32 %tmp to i64
%tmp2 = shl nuw nsw i64 %tmp1, 32
%tmp3 = add nuw nsw i64 %tmp2, 8589934592
%tmp4 = lshr exact i64 %tmp3, 32
%tmp5 = getelementptr inbounds i32, i32* %arg, i64 %tmp4
store i32 0, i32* %tmp5, align 4
%tmp6 = getelementptr inbounds i32, i32* %arg, i64 %tmp1
%tmp7 = load i32, i32* %tmp6, align 4
fence syncscope("workgroup") release
tail call void @llvm.amdgcn.s.barrier()
fence syncscope("workgroup") acquire
%tmp8 = add nuw nsw i64 %tmp2, 4294967296
%tmp9 = lshr exact i64 %tmp8, 32
%tmp10 = getelementptr inbounds i32, i32* %arg, i64 %tmp9
store i32 %tmp7, i32* %tmp10, align 4
ret void
}
; GCN-LABEL: load_vmcnt_global:
; GFX8: flat_load_dword
; GFX9_10: global_load_dword
; GFX8: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GFX9_10: s_waitcnt vmcnt(0){{$}}
; GCN-NEXT: {{global|flat}}_store_dword
define amdgpu_kernel void @load_vmcnt_global(i32 addrspace(1)* %arg) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%tmp1 = zext i32 %tmp to i64
%tmp2 = shl nuw nsw i64 %tmp1, 32
%tmp3 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp1
%tmp4 = load i32, i32 addrspace(1)* %tmp3, align 4
%tmp5 = add nuw nsw i64 %tmp2, 4294967296
%tmp6 = lshr exact i64 %tmp5, 32
%tmp7 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp6
store i32 %tmp4, i32 addrspace(1)* %tmp7, align 4
ret void
}
; GCN-LABEL: load_vmcnt_flat:
; GCN: flat_load_dword
; GCN-NOT: vscnt
; GCN: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GCN-NEXT: {{global|flat}}_store_dword
define amdgpu_kernel void @load_vmcnt_flat(i32* %arg) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%tmp1 = zext i32 %tmp to i64
%tmp2 = shl nuw nsw i64 %tmp1, 32
%tmp3 = getelementptr inbounds i32, i32* %arg, i64 %tmp1
%tmp4 = load i32, i32* %tmp3, align 4
%tmp5 = add nuw nsw i64 %tmp2, 4294967296
%tmp6 = lshr exact i64 %tmp5, 32
%tmp7 = getelementptr inbounds i32, i32* %arg, i64 %tmp6
store i32 %tmp4, i32* %tmp7, align 4
ret void
}
; GCN-LABEL: store_vscnt_private:
; GCN: buffer_store_dword
; GFX8_9: s_waitcnt vmcnt(0)
; GFX10: s_waitcnt_vscnt null, 0x0
; GCN-NEXT: s_setpc_b64
define void @store_vscnt_private(i32 addrspace(5)* %p) {
store i32 0, i32 addrspace(5)* %p
ret void
}
; GCN-LABEL: store_vscnt_global:
; GFX8: flat_store_dword
; GFX9_10: global_store_dword
; GFX8_9: s_waitcnt vmcnt(0)
; GFX10: s_waitcnt_vscnt null, 0x0
; GCN-NEXT: s_setpc_b64
define void @store_vscnt_global(i32 addrspace(1)* %p) {
store i32 0, i32 addrspace(1)* %p
ret void
}
; GCN-LABEL: store_vscnt_flat:
; GCN: flat_store_dword
; GFX8_9: s_waitcnt vmcnt(0) lgkmcnt(0){{$}}
; GFX10: s_waitcnt lgkmcnt(0){{$}}
; GFX10: s_waitcnt_vscnt null, 0x0
; GCN-NEXT: s_setpc_b64
define void @store_vscnt_flat(i32* %p) {
store i32 0, i32* %p
ret void
}
; GCN-LABEL: function_prologue:
; GCN: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0){{$}}
; GFX10: s_waitcnt_vscnt null, 0x0
; GCN-NEXT: s_setpc_b64
define void @function_prologue() {
ret void
}
declare void @llvm.amdgcn.s.barrier()
declare i32 @llvm.amdgcn.workitem.id.x()
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