31 lines
996 B
LLVM
31 lines
996 B
LLVM
; RUN: opt %s -analyze -divergence -use-gpu-divergence-analysis | FileCheck %s
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target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
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target triple = "nvptx64-nvidia-cuda"
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define i32 @hidden_diverge(i32 %n, i32 %a, i32 %b) {
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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.nvvm.read.ptx.sreg.tid.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 i32 %phi.ipd
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}
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declare i32 @llvm.nvvm.read.ptx.sreg.tid.x()
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!nvvm.annotations = !{!0}
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!0 = !{i32 (i32, i32, i32)* @hidden_diverge, !"kernel", i32 1}
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