78 lines
2.8 KiB
LLVM
78 lines
2.8 KiB
LLVM
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; XFAIL: *
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; RUN: opt -mtriple=amdgcn-amd-amdhsa -S -structurizecfg -verify-region-info %s -enable-new-pm=0
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; FIXME: Merge into backedge-id-bug
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; Variant which has an issue with region construction
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define amdgpu_kernel void @loop_backedge_misidentified_alt(i32 addrspace(1)* %arg0) #0 {
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entry:
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%tmp = load volatile <2 x i32>, <2 x i32> addrspace(1)* undef, align 16
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%load1 = load volatile <2 x float>, <2 x float> addrspace(1)* undef
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%tid = call i32 @llvm.amdgcn.workitem.id.x()
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%gep = getelementptr inbounds i32, i32 addrspace(1)* %arg0, i32 %tid
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%i.initial = load volatile i32, i32 addrspace(1)* %gep, align 4
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br label %LOOP.HEADER
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LOOP.HEADER:
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%i = phi i32 [ %i.final, %END_ELSE_BLOCK ], [ %i.initial, %entry ]
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call void asm sideeffect "s_nop 0x100b ; loop $0 ", "r,~{memory}"(i32 %i) #0
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%tmp12 = zext i32 %i to i64
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%tmp13 = getelementptr inbounds <4 x i32>, <4 x i32> addrspace(1)* null, i64 %tmp12
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%tmp14 = load <4 x i32>, <4 x i32> addrspace(1)* %tmp13, align 16
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%tmp15 = extractelement <4 x i32> %tmp14, i64 0
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%tmp16 = and i32 %tmp15, 65535
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%tmp17 = icmp eq i32 %tmp16, 1
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br i1 %tmp17, label %bb18, label %bb62
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bb18:
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%tmp19 = extractelement <2 x i32> %tmp, i64 0
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%tmp22 = lshr i32 %tmp19, 16
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%tmp24 = urem i32 %tmp22, 52
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%tmp25 = mul nuw nsw i32 %tmp24, 52
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br label %INNER_LOOP
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INNER_LOOP:
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%inner.loop.j = phi i32 [ %tmp25, %bb18 ], [ %inner.loop.j.inc, %INNER_LOOP ]
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call void asm sideeffect "; inner loop body", ""() #0
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%inner.loop.j.inc = add nsw i32 %inner.loop.j, 1
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%inner.loop.cmp = icmp eq i32 %inner.loop.j, 0
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br i1 %inner.loop.cmp, label %INNER_LOOP_BREAK, label %INNER_LOOP
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INNER_LOOP_BREAK:
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%tmp59 = extractelement <4 x i32> %tmp14, i64 2
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call void asm sideeffect "s_nop 23 ", "~{memory}"() #0
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br label %END_ELSE_BLOCK
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bb62:
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%load13 = icmp ult i32 %tmp16, 271
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;br i1 %load13, label %bb64, label %INCREMENT_I
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; branching directly to the return avoids the bug
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br i1 %load13, label %RETURN, label %INCREMENT_I
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bb64:
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call void asm sideeffect "s_nop 42", "~{memory}"() #0
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br label %RETURN
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INCREMENT_I:
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%inc.i = add i32 %i, 1
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call void asm sideeffect "s_nop 0x1336 ; increment $0", "v,~{memory}"(i32 %inc.i) #0
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br label %END_ELSE_BLOCK
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END_ELSE_BLOCK:
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%i.final = phi i32 [ %tmp59, %INNER_LOOP_BREAK ], [ %inc.i, %INCREMENT_I ]
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call void asm sideeffect "s_nop 0x1337 ; end else block $0", "v,~{memory}"(i32 %i.final) #0
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%cmp.end.else.block = icmp eq i32 %i.final, -1
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br i1 %cmp.end.else.block, label %RETURN, label %LOOP.HEADER
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RETURN:
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call void asm sideeffect "s_nop 0x99 ; ClosureEval return", "~{memory}"() #0
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store volatile <2 x float> %load1, <2 x float> addrspace(1)* undef, align 8
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ret void
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}
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declare i32 @llvm.amdgcn.workitem.id.x() #1
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attributes #0 = { convergent nounwind }
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attributes #1 = { convergent nounwind readnone }
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