64 lines
1.7 KiB
LLVM
64 lines
1.7 KiB
LLVM
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; RUN: opt -mtriple amdgcn-unknown-amdhsa -analyze -divergence -use-gpu-divergence-analysis %s | FileCheck %s
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define amdgpu_kernel void @hidden_diverge(i32 %n, i32 %a, i32 %b) #0 {
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; CHECK-LABEL: Printing analysis 'Legacy Divergence Analysis' for function 'hidden_diverge'
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entry:
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%tid = call i32 @llvm.amdgcn.workitem.id.x()
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%cond.var = icmp slt i32 %tid, 0
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br i1 %cond.var, label %B, label %C ; divergent
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; CHECK: DIVERGENT: br i1 %cond.var,
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B:
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%cond.uni = icmp slt i32 %n, 0
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br i1 %cond.uni, label %C, label %merge ; uniform
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; CHECK-NOT: DIVERGENT: br i1 %cond.uni,
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C:
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%phi.var.hidden = phi i32 [ 1, %entry ], [ 2, %B ]
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; CHECK: DIVERGENT: %phi.var.hidden = phi i32
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br label %merge
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merge:
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%phi.ipd = phi i32 [ %a, %B ], [ %b, %C ]
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; CHECK: DIVERGENT: %phi.ipd = phi i32
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ret void
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}
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define amdgpu_kernel void @hidden_loop_ipd(i32 %n, i32 %a, i32 %b) #0 {
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; CHECK-LABEL: Printing analysis 'Legacy Divergence Analysis' for function 'hidden_loop_ipd'
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entry:
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%tid = call i32 @llvm.amdgcn.workitem.id.x()
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%cond.var = icmp slt i32 %tid, 0
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; CHECK: DIVERGENT: %cond.var = icmp
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%cond.uni = icmp slt i32 %n, 0
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; CHECK-NOT: DIVERGENT: %cond.uni = icmp
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br label %for.header
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for.header:
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br i1 %cond.var, label %A, label %B
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A:
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br label %C
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B:
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br label %C
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C:
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br i1 %cond.uni, label %E, label %D
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D:
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br i1 %cond.var, label %for.header, label %F
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E:
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%e.lcssa.uni = phi i32 [ 0, %C ]
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; CHECK-NOT: DIVERGENT: %e.lcssa.uni = phi i32
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br label %G
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F:
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%f.lcssa.uni = phi i32 [ 1, %D ]
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; CHECK-NOT: DIVERGENT: %f.lcssa.uni = phi i32
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br label %G
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G:
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%g.join.var = phi i32 [ %e.lcssa.uni, %E ], [ %f.lcssa.uni, %F ]
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; CHECK: DIVERGENT: %g.join.var = phi i32
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ret void
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}
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declare i32 @llvm.amdgcn.workitem.id.x() #0
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attributes #0 = { nounwind readnone }
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