ea91cca593
The wave barrier represents the discardable barrier. Its main purpose is to carry convergent attribute, thus preventing illegal CFG optimizations. All lanes in a wave come to convergence point simultaneously with SIMT, thus no special instruction is needed in the ISA. The barrier is discarded during code generation. Differential Revision: https://reviews.llvm.org/D26585 llvm-svn: 287007
17 lines
387 B
LLVM
17 lines
387 B
LLVM
; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
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; GCN-LABEL: {{^}}test_wave_barrier:
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; GCN-DAG: ; wave barrier
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; GCN-NOT: s_barrier
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define void @test_wave_barrier() #0 {
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entry:
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call void @llvm.amdgcn.wave.barrier() #1
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ret void
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}
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declare void @llvm.amdgcn.wave.barrier() #1
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attributes #0 = { nounwind }
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attributes #1 = { convergent nounwind }
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