f90849dfa3
Adds & uses a new `isDivergentUse` API in UA. UniformityAnalysis now requires CycleInfo as well as the new temporal divergence API can query it. ----- Original patch that adds `isDivergentUse` by @sameerds The user of a temporally divergent value is marked as divergent in the uniformity analysis. But the same user may also have been marked divergent for other reasons, thus losing this information about temporal divergence. But some clients need to specificly check for temporal divergence. This change restores such an API, that already existed in DivergenceAnalysis. Reviewed By: sameerds, foad Differential Revision: https://reviews.llvm.org/D146018
45 lines
1.2 KiB
LLVM
45 lines
1.2 KiB
LLVM
; RUN: llc -march=amdgcn -mcpu=gfx900 -amdgpu-atomic-optimizations=true < %s | FileCheck %s
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@local = addrspace(3) global i32 undef
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define amdgpu_kernel void @reducible() {
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; CHECK-LABEL: reducible:
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; CHECK-NOT: dpp
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entry:
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%x = call i32 @llvm.amdgcn.workitem.id.x()
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br label %loop
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loop:
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%i = phi i32 [ 0, %entry ], [ %i1, %loop ]
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%gep = getelementptr i32, ptr addrspace(3) @local, i32 %i
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%cond = icmp ult i32 %i, %x
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%i1 = add i32 %i, 1
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br i1 %cond, label %loop, label %exit
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exit:
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%old = atomicrmw add ptr addrspace(3) %gep, i32 %x acq_rel
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ret void
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}
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define amdgpu_kernel void @def_in_nested_cycle() {
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; CHECK-LABEL: def_in_nested_cycle:
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; CHECK-NOT: dpp
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entry:
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%x = call i32 @llvm.amdgcn.workitem.id.x()
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br label %loop
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loop:
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%i = phi i32 [ 0, %entry ], [ 0, %innerloop ], [ %i1, %loop ]
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%cond = icmp ult i32 %i, %x
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%i1 = add i32 %i, 1
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br i1 %cond, label %innerloop, label %loop
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innerloop:
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%i.inner = phi i32 [ 0, %loop ], [ %i1.inner, %innerloop ]
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%gep = getelementptr i32, ptr addrspace(3) @local, i32 %i
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%i1.inner = add i32 %i, 1
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%cond.inner = icmp ult i32 %i, %x
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br i1 %cond, label %innerloop, label %loop
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exit:
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%old = atomicrmw add ptr addrspace(3) %gep, i32 %x acq_rel
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ret void
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}
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declare i32 @llvm.amdgcn.workitem.id.x()
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