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If a workgroup size is known to be not greater than wavefront size the s_barrier instruction is not needed since all threads are guarantied to come to the same point at the same time. Differential Revision: https://reviews.llvm.org/D31731 llvm-svn: 299659
31 lines
809 B
LLVM
31 lines
809 B
LLVM
; RUN: llc -march=amdgcn < %s | FileCheck %s
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; CHECK-LABEL: {{^}}unknown_wgs:
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; CHECK: s_barrier
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define amdgpu_kernel void @unknown_wgs() {
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tail call void @llvm.amdgcn.s.barrier() #0
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ret void
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}
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; CHECK-LABEL: {{^}}flat_wgs_attr_32_128:
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; CHECK: s_barrier
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define amdgpu_kernel void @flat_wgs_attr_32_128() #1 {
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tail call void @llvm.amdgcn.s.barrier() #0
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ret void
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}
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; CHECK-LABEL: {{^}}flat_wgs_attr_32_64:
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; CHECK: :
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; CHECK-NEXT: ; wave barrier
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; CHECK-NEXT: s_endpgm
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define amdgpu_kernel void @flat_wgs_attr_32_64() #2 {
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tail call void @llvm.amdgcn.s.barrier() #0
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ret void
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}
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declare void @llvm.amdgcn.s.barrier() #0
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attributes #0 = { convergent nounwind }
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attributes #1 = { nounwind "amdgpu-flat-work-group-size"="32,128" }
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attributes #2 = { nounwind "amdgpu-flat-work-group-size"="32,64" }
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