derek.holloway
7502bf64a4
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73 lines
2.6 KiB
LLVM
73 lines
2.6 KiB
LLVM
; RUN: opt < %s -aa-pipeline=basic-aa,scoped-noalias-aa -passes='print<memoryssa>' -disable-output 2>&1 | FileCheck %s
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; Test that ScopedNoAliasAA::getModRefInfo(FenceInst) uses scoped noalias
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; metadata to prove a fence cannot affect a given memory location.
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; MemorySSA exposes this: when the fence is NoModRef w.r.t. a load, the
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; load's clobbering access is liveOnEntry (not the fence).
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define i32 @fence_noalias(ptr %p) {
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; CHECK-LABEL: MemorySSA for function: fence_noalias
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; Fence has !noalias covering the load's scope -> not a clobber.
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %v1 = load
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %v2 = load
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%v1 = load i32, ptr %p, align 4, !alias.scope !0, !noalias !3
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fence syncscope("workgroup") release, !noalias !5
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%v2 = load i32, ptr %p, align 4, !alias.scope !0, !noalias !3
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%sum = add i32 %v1, %v2
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ret i32 %sum
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}
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define i32 @fence_alias_scope(ptr %p) {
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; CHECK-LABEL: MemorySSA for function: fence_alias_scope
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; Symmetric: fence has !alias.scope, load has !noalias covering it.
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %v1 = load
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %v2 = load
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%v1 = load i32, ptr %p, align 4, !alias.scope !0, !noalias !7
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fence syncscope("workgroup") release, !alias.scope !7
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%v2 = load i32, ptr %p, align 4, !alias.scope !0, !noalias !7
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%sum = add i32 %v1, %v2
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ret i32 %sum
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}
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define i32 @fence_no_metadata(ptr %p) {
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; CHECK-LABEL: MemorySSA for function: fence_no_metadata
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; No metadata on fence -> fence is a clobber for the second load.
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %v1 = load
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; CHECK: MemoryUse([[FENCE:.*]])
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; CHECK-NEXT: %v2 = load
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%v1 = load i32, ptr %p, align 4, !alias.scope !0, !noalias !3
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fence syncscope("workgroup") release
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%v2 = load i32, ptr %p, align 4, !alias.scope !0, !noalias !3
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%sum = add i32 %v1, %v2
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ret i32 %sum
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}
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define i32 @fence_partial_noalias(ptr %p) {
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; CHECK-LABEL: MemorySSA for function: fence_partial_noalias
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; Fence has !noalias for other_arg_scope only, load is in arg_scope.
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; Scopes don't match -> fence is still a clobber.
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; CHECK: MemoryUse(liveOnEntry)
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; CHECK-NEXT: %v1 = load
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; CHECK: MemoryUse([[FENCE2:.*]])
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; CHECK-NEXT: %v2 = load
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%v1 = load i32, ptr %p, align 4, !alias.scope !0, !noalias !3
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fence syncscope("workgroup") release, !noalias !3
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%v2 = load i32, ptr %p, align 4, !alias.scope !0, !noalias !3
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%sum = add i32 %v1, %v2
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ret i32 %sum
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}
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!0 = !{!1}
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!1 = distinct !{!1, !2, !"arg_scope"}
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!2 = distinct !{!2, !"kernel_domain"}
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!3 = !{!4}
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!4 = distinct !{!4, !2, !"other_arg_scope"}
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!5 = !{!1, !4}
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!6 = distinct !{!6, !2, !"fence_sync_scope"}
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!7 = !{!6}
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