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llvm-mirror/test/CodeGen/AMDGPU/multi-divergent-exit-region.ll
Nirav Dave 51790b5c0b Bias physical register immediate assignments 
The machine scheduler currently biases register copies to/from
physical registers to be closer to their point of use / def to
minimize their live ranges. This change extends this to also physical
register assignments from immediate values.

This causes a reduction in reduction in overall register pressure and
minor reduction in spills and indirectly fixes an out-of-registers
assertion (PR39391).

Most test changes are from minor instruction reorderings and register
name selection changes and direct consequences of that.

Reviewers: MatzeB, qcolombet, myatsina, pcc

Subscribers: nemanjai, jvesely, nhaehnle, eraman, hiraditya,
  javed.absar, arphaman, jfb, jsji, llvm-commits

Differential Revision: https://reviews.llvm.org/D54218

llvm-svn: 346894
2018-11-14 21:11:53 +00:00

726 lines
26 KiB
LLVM
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; RUN: opt -mtriple=amdgcn-- -S -amdgpu-unify-divergent-exit-nodes -verify -structurizecfg -verify -si-annotate-control-flow %s | FileCheck -check-prefix=IR %s
; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
; Add an extra verifier runs. There were some cases where invalid IR
; was produced but happened to be fixed by the later passes.
; Make sure divergent control flow with multiple exits from a region
; is properly handled. UnifyFunctionExitNodes should be run before
; StructurizeCFG.
; IR-LABEL: @multi_divergent_region_exit_ret_ret(
; IR: %1 = call { i1, i64 } @llvm.amdgcn.if(i1 %0)
; IR: %2 = extractvalue { i1, i64 } %1, 0
; IR: %3 = extractvalue { i1, i64 } %1, 1
; IR: br i1 %2, label %LeafBlock1, label %Flow
; IR: Flow:
; IR: %4 = phi i1 [ true, %LeafBlock1 ], [ false, %entry ]
; IR: %5 = phi i1 [ %10, %LeafBlock1 ], [ false, %entry ]
; IR: %6 = call { i1, i64 } @llvm.amdgcn.else(i64 %3)
; IR: %7 = extractvalue { i1, i64 } %6, 0
; IR: %8 = extractvalue { i1, i64 } %6, 1
; IR: br i1 %7, label %LeafBlock, label %Flow1
; IR: LeafBlock:
; IR: br label %Flow1
; IR: LeafBlock1:
; IR: br label %Flow{{$}}
; IR: Flow2:
; IR: %11 = phi i1 [ false, %exit1 ], [ %15, %Flow1 ]
; IR: call void @llvm.amdgcn.end.cf(i64 %19)
; IR: %12 = call { i1, i64 } @llvm.amdgcn.if(i1 %11)
; IR: %13 = extractvalue { i1, i64 } %12, 0
; IR: %14 = extractvalue { i1, i64 } %12, 1
; IR: br i1 %13, label %exit0, label %UnifiedReturnBlock
; IR: exit0:
; IR: store volatile i32 9, i32 addrspace(1)* undef
; IR: br label %UnifiedReturnBlock
; IR: Flow1:
; IR: %15 = phi i1 [ %SwitchLeaf, %LeafBlock ], [ %4, %Flow ]
; IR: %16 = phi i1 [ %9, %LeafBlock ], [ %5, %Flow ]
; IR: call void @llvm.amdgcn.end.cf(i64 %8)
; IR: %17 = call { i1, i64 } @llvm.amdgcn.if(i1 %16)
; IR: %18 = extractvalue { i1, i64 } %17, 0
; IR: %19 = extractvalue { i1, i64 } %17, 1
; IR: br i1 %18, label %exit1, label %Flow2
; IR: exit1:
; IR: store volatile i32 17, i32 addrspace(3)* undef
; IR: br label %Flow2
; IR: UnifiedReturnBlock:
; IR: call void @llvm.amdgcn.end.cf(i64 %14)
; IR: ret void
; GCN-LABEL: {{^}}multi_divergent_region_exit_ret_ret:
; GCN-DAG: s_mov_b64 [[EXIT1:s\[[0-9]+:[0-9]+\]]], 0
; GCN-DAG: v_cmp_lt_i32_e32 vcc, 1,
; GCN-DAG: s_mov_b64 [[EXIT0:s\[[0-9]+:[0-9]+\]]], 0
; GCN-DAG: s_and_saveexec_b64
; GCN-DAG: s_xor_b64
; GCN: ; %LeafBlock1
; GCN-NEXT: s_mov_b64 [[EXIT0]], exec
; GCN-NEXT: v_cmp_ne_u32_e32 vcc, 2,
; GCN-NEXT: s_and_b64 [[EXIT1]], vcc, exec
; GCN: ; %Flow
; GCN-NEXT: s_or_saveexec_b64
; GCN-NEXT: s_xor_b64
; FIXME: Why is this compare essentially repeated?
; GCN: ; %LeafBlock
; GCN-DAG: v_cmp_eq_u32_e32 vcc, 1,
; GCN-DAG: v_cmp_ne_u32_e64 [[TMP1:s\[[0-9]+:[0-9]+\]]], 1,
; GCN-DAG: s_andn2_b64 [[EXIT0]], [[EXIT0]], exec
; GCN-DAG: s_andn2_b64 [[EXIT1]], [[EXIT1]], exec
; GCN-DAG: s_and_b64 [[TMP0:s\[[0-9]+:[0-9]+\]]], vcc, exec
; GCN-DAG: s_and_b64 [[TMP1]], [[TMP1]], exec
; GCN-DAG: s_or_b64 [[EXIT0]], [[EXIT0]], [[TMP0]]
; GCN-DAG: s_or_b64 [[EXIT1]], [[EXIT1]], [[TMP1]]
; GCN: ; %Flow4
; GCN-NEXT: s_or_b64 exec, exec,
; GCN-NEXT: s_and_saveexec_b64 {{s\[[0-9]+:[0-9]+\]}}, [[EXIT1]]
; GCN-NEXT: s_xor_b64
; GCN: ; %exit1
; GCN-DAG: ds_write_b32
; GCN-DAG: s_andn2_b64 [[EXIT0]], [[EXIT0]], exec
; GCN: ; %Flow5
; GCN-NEXT: s_or_b64 exec, exec,
; GCN-NEXT; s_and_saveexec_b64 {{s\[[0-9]+:[0-9]+\]}}, [[EXIT0]]
; GCN: ; %exit0
; GCN: buffer_store_dword
; GCN: ; %UnifiedReturnBlock
; GCN-NEXT: s_endpgm
define amdgpu_kernel void @multi_divergent_region_exit_ret_ret(i32 addrspace(1)* nocapture %arg0, i32 addrspace(1)* nocapture %arg1, i32 addrspace(1)* nocapture %arg2) #0 {
entry:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #1
%tmp1 = add i32 0, %tmp
%tmp2 = zext i32 %tmp1 to i64
%tmp3 = add i64 0, %tmp2
%tmp4 = shl i64 %tmp3, 32
%tmp5 = ashr exact i64 %tmp4, 32
%tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg0, i64 %tmp5
%tmp7 = load i32, i32 addrspace(1)* %tmp6, align 4
%tmp8 = sext i32 %tmp7 to i64
%tmp9 = getelementptr inbounds i32, i32 addrspace(1)* %arg1, i64 %tmp8
%tmp10 = load i32, i32 addrspace(1)* %tmp9, align 4
%tmp13 = zext i32 %tmp10 to i64
%tmp14 = getelementptr inbounds i32, i32 addrspace(1)* %arg2, i64 %tmp13
%tmp16 = load i32, i32 addrspace(1)* %tmp14, align 16
%Pivot = icmp slt i32 %tmp16, 2
br i1 %Pivot, label %LeafBlock, label %LeafBlock1
LeafBlock: ; preds = %entry
%SwitchLeaf = icmp eq i32 %tmp16, 1
br i1 %SwitchLeaf, label %exit0, label %exit1
LeafBlock1: ; preds = %entry
%SwitchLeaf2 = icmp eq i32 %tmp16, 2
br i1 %SwitchLeaf2, label %exit0, label %exit1
exit0: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 9, i32 addrspace(1)* undef
ret void
exit1: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 17, i32 addrspace(3)* undef
ret void
}
; IR-LABEL: @multi_divergent_region_exit_unreachable_unreachable(
; IR: %1 = call { i1, i64 } @llvm.amdgcn.if(i1 %0)
; IR: %6 = call { i1, i64 } @llvm.amdgcn.else(i64 %3)
; IR: %11 = phi i1 [ false, %exit1 ], [ %15, %Flow1 ]
; IR: call void @llvm.amdgcn.end.cf(i64 %19)
; IR: %12 = call { i1, i64 } @llvm.amdgcn.if(i1 %11)
; IR: br i1 %13, label %exit0, label %UnifiedUnreachableBlock
; IR: UnifiedUnreachableBlock:
; IR-NEXT: unreachable
; FIXME: Probably should insert an s_endpgm anyway.
; GCN-LABEL: {{^}}multi_divergent_region_exit_unreachable_unreachable:
; GCN: ; %UnifiedUnreachableBlock
; GCN-NEXT: .Lfunc_end
define amdgpu_kernel void @multi_divergent_region_exit_unreachable_unreachable(i32 addrspace(1)* nocapture %arg0, i32 addrspace(1)* nocapture %arg1, i32 addrspace(1)* nocapture %arg2) #0 {
entry:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #1
%tmp1 = add i32 0, %tmp
%tmp2 = zext i32 %tmp1 to i64
%tmp3 = add i64 0, %tmp2
%tmp4 = shl i64 %tmp3, 32
%tmp5 = ashr exact i64 %tmp4, 32
%tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg0, i64 %tmp5
%tmp7 = load i32, i32 addrspace(1)* %tmp6, align 4
%tmp8 = sext i32 %tmp7 to i64
%tmp9 = getelementptr inbounds i32, i32 addrspace(1)* %arg1, i64 %tmp8
%tmp10 = load i32, i32 addrspace(1)* %tmp9, align 4
%tmp13 = zext i32 %tmp10 to i64
%tmp14 = getelementptr inbounds i32, i32 addrspace(1)* %arg2, i64 %tmp13
%tmp16 = load i32, i32 addrspace(1)* %tmp14, align 16
%Pivot = icmp slt i32 %tmp16, 2
br i1 %Pivot, label %LeafBlock, label %LeafBlock1
LeafBlock: ; preds = %entry
%SwitchLeaf = icmp eq i32 %tmp16, 1
br i1 %SwitchLeaf, label %exit0, label %exit1
LeafBlock1: ; preds = %entry
%SwitchLeaf2 = icmp eq i32 %tmp16, 2
br i1 %SwitchLeaf2, label %exit0, label %exit1
exit0: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 9, i32 addrspace(1)* undef
unreachable
exit1: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 17, i32 addrspace(3)* undef
unreachable
}
; IR-LABEL: @multi_exit_region_divergent_ret_uniform_ret(
; IR: %divergent.cond0 = icmp slt i32 %tmp16, 2
; IR: llvm.amdgcn.if
; IR: br i1
; IR: {{^}}Flow:
; IR: %4 = phi i1 [ true, %LeafBlock1 ], [ false, %entry ]
; IR: %5 = phi i1 [ %10, %LeafBlock1 ], [ false, %entry ]
; IR: %6 = call { i1, i64 } @llvm.amdgcn.else(i64 %3)
; IR: br i1 %7, label %LeafBlock, label %Flow1
; IR: {{^}}LeafBlock:
; IR: %divergent.cond1 = icmp eq i32 %tmp16, 1
; IR: %9 = xor i1 %divergent.cond1, true
; IR: br label %Flow1
; IR: LeafBlock1:
; IR: %uniform.cond0 = icmp eq i32 %arg3, 2
; IR: %10 = xor i1 %uniform.cond0, true
; IR: br label %Flow
; IR: Flow2:
; IR: %11 = phi i1 [ false, %exit1 ], [ %15, %Flow1 ]
; IR: call void @llvm.amdgcn.end.cf(i64 %19)
; IR: %12 = call { i1, i64 } @llvm.amdgcn.if(i1 %11)
; IR: br i1 %13, label %exit0, label %UnifiedReturnBlock
; IR: exit0:
; IR: store volatile i32 9, i32 addrspace(1)* undef
; IR: br label %UnifiedReturnBlock
; IR: {{^}}Flow1:
; IR: %15 = phi i1 [ %divergent.cond1, %LeafBlock ], [ %4, %Flow ]
; IR: %16 = phi i1 [ %9, %LeafBlock ], [ %5, %Flow ]
; IR: call void @llvm.amdgcn.end.cf(i64 %8)
; IR: %17 = call { i1, i64 } @llvm.amdgcn.if(i1 %16)
; IR: %18 = extractvalue { i1, i64 } %17, 0
; IR: %19 = extractvalue { i1, i64 } %17, 1
; IR: br i1 %18, label %exit1, label %Flow2
; IR: exit1:
; IR: store volatile i32 17, i32 addrspace(3)* undef
; IR: br label %Flow2
; IR: UnifiedReturnBlock:
; IR: call void @llvm.amdgcn.end.cf(i64 %14)
; IR: ret void
define amdgpu_kernel void @multi_exit_region_divergent_ret_uniform_ret(i32 addrspace(1)* nocapture %arg0, i32 addrspace(1)* nocapture %arg1, i32 addrspace(1)* nocapture %arg2, i32 %arg3) #0 {
entry:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #1
%tmp1 = add i32 0, %tmp
%tmp2 = zext i32 %tmp1 to i64
%tmp3 = add i64 0, %tmp2
%tmp4 = shl i64 %tmp3, 32
%tmp5 = ashr exact i64 %tmp4, 32
%tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg0, i64 %tmp5
%tmp7 = load i32, i32 addrspace(1)* %tmp6, align 4
%tmp8 = sext i32 %tmp7 to i64
%tmp9 = getelementptr inbounds i32, i32 addrspace(1)* %arg1, i64 %tmp8
%tmp10 = load i32, i32 addrspace(1)* %tmp9, align 4
%tmp13 = zext i32 %tmp10 to i64
%tmp14 = getelementptr inbounds i32, i32 addrspace(1)* %arg2, i64 %tmp13
%tmp16 = load i32, i32 addrspace(1)* %tmp14, align 16
%divergent.cond0 = icmp slt i32 %tmp16, 2
br i1 %divergent.cond0, label %LeafBlock, label %LeafBlock1
LeafBlock: ; preds = %entry
%divergent.cond1 = icmp eq i32 %tmp16, 1
br i1 %divergent.cond1, label %exit0, label %exit1
LeafBlock1: ; preds = %entry
%uniform.cond0 = icmp eq i32 %arg3, 2
br i1 %uniform.cond0, label %exit0, label %exit1
exit0: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 9, i32 addrspace(1)* undef
ret void
exit1: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 17, i32 addrspace(3)* undef
ret void
}
; IR-LABEL: @multi_exit_region_uniform_ret_divergent_ret(
; IR: %1 = call { i1, i64 } @llvm.amdgcn.if(i1 %0)
; IR: br i1 %2, label %LeafBlock1, label %Flow
; IR: Flow:
; IR: %4 = phi i1 [ true, %LeafBlock1 ], [ false, %entry ]
; IR: %5 = phi i1 [ %10, %LeafBlock1 ], [ false, %entry ]
; IR: %6 = call { i1, i64 } @llvm.amdgcn.else(i64 %3)
; IR: %11 = phi i1 [ false, %exit1 ], [ %15, %Flow1 ]
; IR: call void @llvm.amdgcn.end.cf(i64 %19)
; IR: %12 = call { i1, i64 } @llvm.amdgcn.if(i1 %11)
define amdgpu_kernel void @multi_exit_region_uniform_ret_divergent_ret(i32 addrspace(1)* nocapture %arg0, i32 addrspace(1)* nocapture %arg1, i32 addrspace(1)* nocapture %arg2, i32 %arg3) #0 {
entry:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #1
%tmp1 = add i32 0, %tmp
%tmp2 = zext i32 %tmp1 to i64
%tmp3 = add i64 0, %tmp2
%tmp4 = shl i64 %tmp3, 32
%tmp5 = ashr exact i64 %tmp4, 32
%tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg0, i64 %tmp5
%tmp7 = load i32, i32 addrspace(1)* %tmp6, align 4
%tmp8 = sext i32 %tmp7 to i64
%tmp9 = getelementptr inbounds i32, i32 addrspace(1)* %arg1, i64 %tmp8
%tmp10 = load i32, i32 addrspace(1)* %tmp9, align 4
%tmp13 = zext i32 %tmp10 to i64
%tmp14 = getelementptr inbounds i32, i32 addrspace(1)* %arg2, i64 %tmp13
%tmp16 = load i32, i32 addrspace(1)* %tmp14, align 16
%Pivot = icmp slt i32 %tmp16, 2
br i1 %Pivot, label %LeafBlock, label %LeafBlock1
LeafBlock: ; preds = %entry
%SwitchLeaf = icmp eq i32 %arg3, 1
br i1 %SwitchLeaf, label %exit0, label %exit1
LeafBlock1: ; preds = %entry
%SwitchLeaf2 = icmp eq i32 %tmp16, 2
br i1 %SwitchLeaf2, label %exit0, label %exit1
exit0: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 9, i32 addrspace(1)* undef
ret void
exit1: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 17, i32 addrspace(3)* undef
ret void
}
; IR-LABEL: @multi_divergent_region_exit_ret_ret_return_value(
; IR: Flow2:
; IR: %11 = phi i1 [ false, %exit1 ], [ %15, %Flow1 ]
; IR: call void @llvm.amdgcn.end.cf(i64 %19)
; IR: UnifiedReturnBlock:
; IR: %UnifiedRetVal = phi float [ 2.000000e+00, %Flow2 ], [ 1.000000e+00, %exit0 ]
; IR: call void @llvm.amdgcn.end.cf(i64 %14)
; IR: ret float %UnifiedRetVal
define amdgpu_ps float @multi_divergent_region_exit_ret_ret_return_value(i32 %vgpr) #0 {
entry:
%Pivot = icmp slt i32 %vgpr, 2
br i1 %Pivot, label %LeafBlock, label %LeafBlock1
LeafBlock: ; preds = %entry
%SwitchLeaf = icmp eq i32 %vgpr, 1
br i1 %SwitchLeaf, label %exit0, label %exit1
LeafBlock1: ; preds = %entry
%SwitchLeaf2 = icmp eq i32 %vgpr, 2
br i1 %SwitchLeaf2, label %exit0, label %exit1
exit0: ; preds = %LeafBlock, %LeafBlock1
store i32 9, i32 addrspace(1)* undef
ret float 1.0
exit1: ; preds = %LeafBlock, %LeafBlock1
store i32 17, i32 addrspace(3)* undef
ret float 2.0
}
; IR-LABEL: @uniform_branch_to_multi_divergent_region_exit_ret_ret_return_value(
; GCN-LABEL: {{^}}uniform_branch_to_multi_divergent_region_exit_ret_ret_return_value:
; GCN: s_cmp_gt_i32 s0, 1
; GCN: s_cbranch_scc0 [[FLOW:BB[0-9]+_[0-9]+]]
; GCN: v_cmp_ne_u32_e32 vcc, 7, v0
; GCN: {{^}}[[FLOW]]:
; GCN: s_cbranch_vccnz [[FLOW1:BB[0-9]+]]
; GCN: s_or_b64 exec, exec
; GCN: v_mov_b32_e32 v0, 2.0
; GCN-NOT: s_and_b64 exec, exec
; GCN: v_mov_b32_e32 v0, 1.0
; GCN: {{^BB[0-9]+_[0-9]+}}: ; %UnifiedReturnBlock
; GCN-NEXT: s_or_b64 exec, exec
; GCN-NEXT: s_waitcnt vmcnt(0) lgkmcnt(0)
; GCN-NEXT: ; return
define amdgpu_ps float @uniform_branch_to_multi_divergent_region_exit_ret_ret_return_value(i32 inreg %sgpr, i32 %vgpr) #0 {
entry:
%uniform.cond = icmp slt i32 %sgpr, 2
br i1 %uniform.cond, label %LeafBlock, label %LeafBlock1
LeafBlock: ; preds = %entry
%divergent.cond0 = icmp eq i32 %vgpr, 3
br i1 %divergent.cond0, label %exit0, label %exit1
LeafBlock1: ; preds = %entry
%divergent.cond1 = icmp eq i32 %vgpr, 7
br i1 %divergent.cond1, label %exit0, label %exit1
exit0: ; preds = %LeafBlock, %LeafBlock1
store i32 9, i32 addrspace(1)* undef
ret float 1.0
exit1: ; preds = %LeafBlock, %LeafBlock1
store i32 17, i32 addrspace(3)* undef
ret float 2.0
}
; IR-LABEL: @multi_divergent_region_exit_ret_unreachable(
; IR: %1 = call { i1, i64 } @llvm.amdgcn.if(i1 %0)
; IR: Flow:
; IR: %4 = phi i1 [ true, %LeafBlock1 ], [ false, %entry ]
; IR: %5 = phi i1 [ %10, %LeafBlock1 ], [ false, %entry ]
; IR: %6 = call { i1, i64 } @llvm.amdgcn.else(i64 %3)
; IR: Flow2:
; IR: %11 = phi i1 [ false, %exit1 ], [ %15, %Flow1 ]
; IR: call void @llvm.amdgcn.end.cf(i64 %19)
; IR: %12 = call { i1, i64 } @llvm.amdgcn.if(i1 %11)
; IR: br i1 %13, label %exit0, label %UnifiedReturnBlock
; IR: exit0:
; IR-NEXT: store volatile i32 17, i32 addrspace(3)* undef
; IR-NEXT: br label %UnifiedReturnBlock
; IR: Flow1:
; IR: %15 = phi i1 [ %SwitchLeaf, %LeafBlock ], [ %4, %Flow ]
; IR: %16 = phi i1 [ %9, %LeafBlock ], [ %5, %Flow ]
; IR: call void @llvm.amdgcn.end.cf(i64 %8)
; IR: %17 = call { i1, i64 } @llvm.amdgcn.if(i1 %16)
; IR: %18 = extractvalue { i1, i64 } %17, 0
; IR: %19 = extractvalue { i1, i64 } %17, 1
; IR: br i1 %18, label %exit1, label %Flow2
; IR: exit1:
; IR-NEXT: store volatile i32 9, i32 addrspace(1)* undef
; IR-NEXT: call void @llvm.amdgcn.unreachable()
; IR-NEXT: br label %Flow2
; IR: UnifiedReturnBlock:
; IR-NEXT: call void @llvm.amdgcn.end.cf(i64 %14)
; IR-NEXT: ret void
define amdgpu_kernel void @multi_divergent_region_exit_ret_unreachable(i32 addrspace(1)* nocapture %arg0, i32 addrspace(1)* nocapture %arg1, i32 addrspace(1)* nocapture %arg2) #0 {
entry:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #1
%tmp1 = add i32 0, %tmp
%tmp2 = zext i32 %tmp1 to i64
%tmp3 = add i64 0, %tmp2
%tmp4 = shl i64 %tmp3, 32
%tmp5 = ashr exact i64 %tmp4, 32
%tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg0, i64 %tmp5
%tmp7 = load i32, i32 addrspace(1)* %tmp6, align 4
%tmp8 = sext i32 %tmp7 to i64
%tmp9 = getelementptr inbounds i32, i32 addrspace(1)* %arg1, i64 %tmp8
%tmp10 = load i32, i32 addrspace(1)* %tmp9, align 4
%tmp13 = zext i32 %tmp10 to i64
%tmp14 = getelementptr inbounds i32, i32 addrspace(1)* %arg2, i64 %tmp13
%tmp16 = load i32, i32 addrspace(1)* %tmp14, align 16
%Pivot = icmp slt i32 %tmp16, 2
br i1 %Pivot, label %LeafBlock, label %LeafBlock1
LeafBlock: ; preds = %entry
%SwitchLeaf = icmp eq i32 %tmp16, 1
br i1 %SwitchLeaf, label %exit0, label %exit1
LeafBlock1: ; preds = %entry
%SwitchLeaf2 = icmp eq i32 %tmp16, 2
br i1 %SwitchLeaf2, label %exit0, label %exit1
exit0: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 17, i32 addrspace(3)* undef
ret void
exit1: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 9, i32 addrspace(1)* undef
unreachable
}
; The non-uniformity of the branch to the exiting blocks requires
; looking at transitive predecessors.
; IR-LABEL: @indirect_multi_divergent_region_exit_ret_unreachable(
; IR: exit0: ; preds = %Flow2
; IR-NEXT: store volatile i32 17, i32 addrspace(3)* undef
; IR-NEXT: br label %UnifiedReturnBlock
; IR: indirect.exit1:
; IR: %load = load volatile i32, i32 addrspace(1)* undef
; IR: store volatile i32 %load, i32 addrspace(1)* undef
; IR: store volatile i32 9, i32 addrspace(1)* undef
; IR: call void @llvm.amdgcn.unreachable()
; IR-NEXT: br label %Flow2
; IR: UnifiedReturnBlock: ; preds = %exit0, %Flow2
; IR-NEXT: call void @llvm.amdgcn.end.cf(i64 %14)
; IR-NEXT: ret void
define amdgpu_kernel void @indirect_multi_divergent_region_exit_ret_unreachable(i32 addrspace(1)* nocapture %arg0, i32 addrspace(1)* nocapture %arg1, i32 addrspace(1)* nocapture %arg2) #0 {
entry:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #1
%tmp1 = add i32 0, %tmp
%tmp2 = zext i32 %tmp1 to i64
%tmp3 = add i64 0, %tmp2
%tmp4 = shl i64 %tmp3, 32
%tmp5 = ashr exact i64 %tmp4, 32
%tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg0, i64 %tmp5
%tmp7 = load i32, i32 addrspace(1)* %tmp6, align 4
%tmp8 = sext i32 %tmp7 to i64
%tmp9 = getelementptr inbounds i32, i32 addrspace(1)* %arg1, i64 %tmp8
%tmp10 = load i32, i32 addrspace(1)* %tmp9, align 4
%tmp13 = zext i32 %tmp10 to i64
%tmp14 = getelementptr inbounds i32, i32 addrspace(1)* %arg2, i64 %tmp13
%tmp16 = load i32, i32 addrspace(1)* %tmp14, align 16
%Pivot = icmp slt i32 %tmp16, 2
br i1 %Pivot, label %LeafBlock, label %LeafBlock1
LeafBlock: ; preds = %entry
%SwitchLeaf = icmp eq i32 %tmp16, 1
br i1 %SwitchLeaf, label %exit0, label %indirect.exit1
LeafBlock1: ; preds = %entry
%SwitchLeaf2 = icmp eq i32 %tmp16, 2
br i1 %SwitchLeaf2, label %exit0, label %indirect.exit1
exit0: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 17, i32 addrspace(3)* undef
ret void
indirect.exit1:
%load = load volatile i32, i32 addrspace(1)* undef
store volatile i32 %load, i32 addrspace(1)* undef
br label %exit1
exit1: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 9, i32 addrspace(1)* undef
unreachable
}
; IR-LABEL: @multi_divergent_region_exit_ret_switch(
define amdgpu_kernel void @multi_divergent_region_exit_ret_switch(i32 addrspace(1)* nocapture %arg0, i32 addrspace(1)* nocapture %arg1, i32 addrspace(1)* nocapture %arg2) #0 {
entry:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #1
%tmp1 = add i32 0, %tmp
%tmp2 = zext i32 %tmp1 to i64
%tmp3 = add i64 0, %tmp2
%tmp4 = shl i64 %tmp3, 32
%tmp5 = ashr exact i64 %tmp4, 32
%tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg0, i64 %tmp5
%tmp7 = load i32, i32 addrspace(1)* %tmp6, align 4
%tmp8 = sext i32 %tmp7 to i64
%tmp9 = getelementptr inbounds i32, i32 addrspace(1)* %arg1, i64 %tmp8
%tmp10 = load i32, i32 addrspace(1)* %tmp9, align 4
%tmp13 = zext i32 %tmp10 to i64
%tmp14 = getelementptr inbounds i32, i32 addrspace(1)* %arg2, i64 %tmp13
%tmp16 = load i32, i32 addrspace(1)* %tmp14, align 16
switch i32 %tmp16, label %exit1
[ i32 1, label %LeafBlock
i32 2, label %LeafBlock1
i32 3, label %exit0 ]
LeafBlock: ; preds = %entry
%SwitchLeaf = icmp eq i32 %tmp16, 1
br i1 %SwitchLeaf, label %exit0, label %exit1
LeafBlock1: ; preds = %entry
%SwitchLeaf2 = icmp eq i32 %tmp16, 2
br i1 %SwitchLeaf2, label %exit0, label %exit1
exit0: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 17, i32 addrspace(3)* undef
ret void
exit1: ; preds = %LeafBlock, %LeafBlock1
store volatile i32 9, i32 addrspace(1)* undef
unreachable
}
; IR-LABEL: @divergent_multi_ret_nest_in_uniform_triangle(
define amdgpu_kernel void @divergent_multi_ret_nest_in_uniform_triangle(i32 %arg0) #0 {
entry:
%uniform.cond0 = icmp eq i32 %arg0, 4
br i1 %uniform.cond0, label %divergent.multi.exit.region, label %uniform.ret
divergent.multi.exit.region:
%id.x = tail call i32 @llvm.amdgcn.workitem.id.x()
%divergent.cond0 = icmp eq i32 %id.x, 0
br i1 %divergent.cond0, label %divergent.ret0, label %divergent.ret1
divergent.ret0:
store volatile i32 11, i32 addrspace(3)* undef
ret void
divergent.ret1:
store volatile i32 42, i32 addrspace(3)* undef
ret void
uniform.ret:
store volatile i32 9, i32 addrspace(1)* undef
ret void
}
; IR-LABEL: @divergent_complex_multi_ret_nest_in_uniform_triangle(
define amdgpu_kernel void @divergent_complex_multi_ret_nest_in_uniform_triangle(i32 %arg0) #0 {
entry:
%uniform.cond0 = icmp eq i32 %arg0, 4
br i1 %uniform.cond0, label %divergent.multi.exit.region, label %uniform.ret
divergent.multi.exit.region:
%id.x = tail call i32 @llvm.amdgcn.workitem.id.x()
%divergent.cond0 = icmp eq i32 %id.x, 0
br i1 %divergent.cond0, label %divergent.if, label %divergent.ret1
divergent.if:
%vgpr0 = load volatile float, float addrspace(1)* undef
%divergent.cond1 = fcmp ogt float %vgpr0, 1.0
br i1 %divergent.cond1, label %divergent.then, label %divergent.endif
divergent.then:
%vgpr1 = load volatile float, float addrspace(1)* undef
%divergent.cond2 = fcmp olt float %vgpr1, 4.0
store volatile i32 33, i32 addrspace(1)* undef
br i1 %divergent.cond2, label %divergent.ret0, label %divergent.endif
divergent.endif:
store volatile i32 38, i32 addrspace(1)* undef
br label %divergent.ret0
divergent.ret0:
store volatile i32 11, i32 addrspace(3)* undef
ret void
divergent.ret1:
store volatile i32 42, i32 addrspace(3)* undef
ret void
uniform.ret:
store volatile i32 9, i32 addrspace(1)* undef
ret void
}
; IR-LABEL: @uniform_complex_multi_ret_nest_in_divergent_triangle(
; IR: Flow1: ; preds = %uniform.ret1, %uniform.multi.exit.region
; IR: %8 = phi i1 [ false, %uniform.ret1 ], [ true, %uniform.multi.exit.region ]
; IR: br i1 %8, label %uniform.if, label %Flow2
; IR: Flow: ; preds = %uniform.then, %uniform.if
; IR: %11 = phi i1 [ %10, %uniform.then ], [ %9, %uniform.if ]
; IR: br i1 %11, label %uniform.endif, label %uniform.ret0
; IR: UnifiedReturnBlock: ; preds = %Flow3, %Flow2
; IR-NEXT: call void @llvm.amdgcn.end.cf(i64 %6)
; IR-NEXT: ret void
define amdgpu_kernel void @uniform_complex_multi_ret_nest_in_divergent_triangle(i32 %arg0) #0 {
entry:
%id.x = tail call i32 @llvm.amdgcn.workitem.id.x()
%divergent.cond0 = icmp eq i32 %id.x, 0
br i1 %divergent.cond0, label %uniform.multi.exit.region, label %divergent.ret
uniform.multi.exit.region:
%uniform.cond0 = icmp eq i32 %arg0, 4
br i1 %uniform.cond0, label %uniform.if, label %uniform.ret1
uniform.if:
%sgpr0 = load volatile i32, i32 addrspace(4)* undef
%uniform.cond1 = icmp slt i32 %sgpr0, 1
br i1 %uniform.cond1, label %uniform.then, label %uniform.endif
uniform.then:
%sgpr1 = load volatile i32, i32 addrspace(4)* undef
%uniform.cond2 = icmp sge i32 %sgpr1, 4
store volatile i32 33, i32 addrspace(1)* undef
br i1 %uniform.cond2, label %uniform.ret0, label %uniform.endif
uniform.endif:
store volatile i32 38, i32 addrspace(1)* undef
br label %uniform.ret0
uniform.ret0:
store volatile i32 11, i32 addrspace(3)* undef
ret void
uniform.ret1:
store volatile i32 42, i32 addrspace(3)* undef
ret void
divergent.ret:
store volatile i32 9, i32 addrspace(1)* undef
ret void
}
; IR-LABEL: @multi_divergent_unreachable_exit(
; IR: UnifiedUnreachableBlock:
; IR-NEXT: call void @llvm.amdgcn.unreachable()
; IR-NEXT: br label %UnifiedReturnBlock
; IR: UnifiedReturnBlock:
; IR-NEXT: call void @llvm.amdgcn.end.cf(i64
; IR-NEXT: ret void
define amdgpu_kernel void @multi_divergent_unreachable_exit() #0 {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
switch i32 %tmp, label %bb3 [
i32 2, label %bb1
i32 0, label %bb2
]
bb1: ; preds = %bb
unreachable
bb2: ; preds = %bb
unreachable
bb3: ; preds = %bb
switch i32 undef, label %bb5 [
i32 2, label %bb4
]
bb4: ; preds = %bb3
ret void
bb5: ; preds = %bb3
unreachable
}
declare i32 @llvm.amdgcn.workitem.id.x() #1
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }
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