derek.holloway
7502bf64a4
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51 lines
2.0 KiB
LLVM
51 lines
2.0 KiB
LLVM
; RUN: opt < %s -passes='require<profile-summary>,function(codegenprepare)' -S -mtriple=x86_64 | FileCheck %s --implicit-check-not="llvm.fake.use"
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;
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; When performing return duplication to enable
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; tail call optimization we clone fake uses that exist in the to-be-eliminated
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; return block into the predecessor blocks. When doing this with fake uses
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; of PHI-nodes, they cannot be easily copied, but require the correct operand.
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; We are currently not able to do this correctly, so we suppress the cloning
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; of such fake uses at the moment.
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;
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; There should be no fake use of a call result in any of the resulting return
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; blocks.
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; Fake uses of `this` should be duplicated into both return blocks.
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; CHECK: if.then:
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; CHECK: @llvm.fake.use({{.*}}this
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; CHECK: if.else:
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; CHECK: @llvm.fake.use({{.*}}this
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; CHECK: declare void @llvm.fake.use
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source_filename = "test.ll"
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%class.a = type { i8 }
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declare i32 @foo(ptr nonnull dereferenceable(1)) local_unnamed_addr
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declare i32 @bar(ptr nonnull dereferenceable(1)) local_unnamed_addr
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define hidden void @func(ptr nonnull dereferenceable(1) %this) local_unnamed_addr align 2 optdebug {
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entry:
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%b = getelementptr inbounds %class.a, ptr %this, i64 0, i32 0
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%0 = load i8, i8* %b, align 1
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%tobool.not = icmp eq i8 %0, 0
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br i1 %tobool.not, label %if.else, label %if.then
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if.then: ; preds = %entry
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%call = tail call i32 @foo(ptr nonnull dereferenceable(1) %this)
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%call2 = tail call i32 @bar(ptr nonnull dereferenceable(1) %this)
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br label %if.end
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if.else: ; preds = %entry
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%call4 = tail call i32 @bar(ptr nonnull dereferenceable(1) %this)
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%call5 = tail call i32 @foo(ptr nonnull dereferenceable(1) %this)
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%call4.sink = phi i32 [ %call4, %if.else ], [ %call, %if.then ]
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notail call void (...) @llvm.fake.use(i32 %call4.sink)
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notail call void (...) @llvm.fake.use(ptr nonnull %this)
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ret void
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}
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