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594fa2719f
StructurizeCFG can't handle cases with multiple returns creating regions with multiple exits. Create a copy of UnifyFunctionExitNodes that only unifies exit nodes that skips exit nodes with uniform branch sources. llvm-svn: 298729
45 lines
1.5 KiB
LLVM
45 lines
1.5 KiB
LLVM
; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
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; RUN: llc -march=amdgcn -mcpu=tonga -mattr=-flat-for-global -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
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; This used to crash because during intermediate control flow lowering, there
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; was a sequence
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; s_mov_b64 s[0:1], exec
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; s_and_b64 s[2:3], s[0:1], s[2:3] ; def & use of the same register pair
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; ...
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; s_mov_b64_term exec, s[2:3]
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; that was not treated correctly.
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;
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; GCN-LABEL: {{^}}ham:
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; GCN-DAG: v_cmp_lt_f32_e64 [[OTHERCC:s\[[0-9]+:[0-9]+\]]],
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; GCN-DAG: v_cmp_lt_f32_e32 vcc,
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; GCN: s_and_b64 [[AND:s\[[0-9]+:[0-9]+\]]], vcc, [[OTHERCC]]
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; GCN: s_and_saveexec_b64 [[SAVED:s\[[0-9]+:[0-9]+\]]], [[AND]]
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; GCN: s_xor_b64 {{s\[[0-9]+:[0-9]+\]}}, exec, [[SAVED]]
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; GCN: ; mask branch [[BB5:BB[0-9]+_[0-9]+]]
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; GCN-NEXT: BB{{[0-9]+_[0-9]+}}: ; %bb4
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; GCN: ds_write_b32
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; GCN: s_waitcnt
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; GCN-NEXT: [[BB5]]
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; GCN: s_or_b64 exec, exec
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; GCN-NEXT: s_endpgm
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; GCN-NEXT: .Lfunc_end
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define amdgpu_ps void @ham(float %arg, float %arg1) #0 {
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bb:
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%tmp = fcmp ogt float %arg, 0.000000e+00
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%tmp2 = fcmp ogt float %arg1, 0.000000e+00
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%tmp3 = and i1 %tmp, %tmp2
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br i1 %tmp3, label %bb4, label %bb5
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bb4: ; preds = %bb
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store volatile i32 4, i32 addrspace(3)* undef
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unreachable
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bb5: ; preds = %bb
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ret void
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}
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attributes #0 = { nounwind readonly "InitialPSInputAddr"="36983" }
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attributes #1 = { nounwind readnone }
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