df344285e2
Before this commit, having a convergence token on a non-convergent call was considered to be an error. This commit relaxes this requirement and allows convergence tokens to be present on non-convergent calls. When such token is present, they have no effect as the underlying call is non-convergent. This allows passes like DCE to strip `convergent` attribute from functions for which all convergent operations have been stripped. When this happens, a convergence token can still exist in the call-site, causing the verifier to complain. Alternatives have been considered in #134863 and #134844.
63 lines
1.7 KiB
LLVM
63 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals all --version 5
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; RUN: opt %s -passes=bdce -S | FileCheck %s
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define i32 @foo(i32 %a) #0 {
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; CHECK-LABEL: define i32 @foo(
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; CHECK-SAME: i32 [[A:%.*]]) #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: ret i32 [[A]]
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;
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entry:
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%tk0 = call token @llvm.experimental.convergence.entry()
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ret i32 %a
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}
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define void @bar() #0 {
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; CHECK-LABEL: define void @bar(
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; CHECK-SAME: ) #[[ATTR0]] {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: ret void
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;
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entry:
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%tk0 = call token @llvm.experimental.convergence.anchor()
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ret void
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}
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define void @baz() #0 {
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; CHECK-LABEL: define void @baz(
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; CHECK-SAME: ) #[[ATTR0]] {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: br label %[[HEADER:.*]]
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; CHECK: [[HEADER]]:
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; CHECK-NEXT: br i1 true, label %[[BODY:.*]], label %[[EXIT:.*]]
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; CHECK: [[BODY]]:
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; CHECK-NEXT: br label %[[HEADER]]
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; CHECK: [[EXIT]]:
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; CHECK-NEXT: ret void
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;
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entry:
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%tk0 = call token @llvm.experimental.convergence.entry()
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br label %header
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header:
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%tk1 = call token @llvm.experimental.convergence.loop() [ "convergencectrl"(token %tk0) ]
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br i1 true, label %body, label %exit
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body:
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br label %header
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exit:
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ret void
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}
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declare token @llvm.experimental.convergence.entry() #1
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declare token @llvm.experimental.convergence.anchor() #1
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declare token @llvm.experimental.convergence.loop() #1
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attributes #0 = { convergent }
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attributes #1 = { convergent nocallback nofree nosync nounwind willreturn memory(none) }
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;.
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; CHECK: attributes #[[ATTR0]] = { convergent }
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; CHECK: attributes #[[ATTR1:[0-9]+]] = { convergent nocallback nofree nosync nounwind willreturn memory(none) }
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;.
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