derek.holloway
7502bf64a4
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38 lines
955 B
LLVM
38 lines
955 B
LLVM
; RUN: opt -mtriple=x86_64-unknown-unknown -S -codegenprepare <%s -o - | FileCheck %s
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;
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; Ensure return instruction splitting ignores fake uses.
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;
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; IR Generated with clang -O2 -S -emit-llvm -fextend-variable-liveness test.cpp
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;
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;// test.cpp
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;extern int bar(int);
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;
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;int foo2(int i)
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;{
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; --i;
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; if (i <= 0)
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; return -1;
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; return bar(i);
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;}
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declare i32 @_Z3bari(i32) local_unnamed_addr
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define i32 @_Z4foo2i(i32 %i) local_unnamed_addr optdebug {
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entry:
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%dec = add nsw i32 %i, -1
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%cmp = icmp slt i32 %i, 2
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br i1 %cmp, label %cleanup, label %if.end
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if.end: ; preds = %entry
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%call = tail call i32 @_Z3bari(i32 %dec)
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; CHECK: ret i32 %call
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br label %cleanup
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cleanup: ; preds = %entry, %if.end
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; CHECK: cleanup:
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%retval.0 = phi i32 [ %call, %if.end ], [ -1, %entry ]
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tail call void (...) @llvm.fake.use(i32 %dec)
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; CHECK: ret i32 -1
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ret i32 %retval.0
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}
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