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c9829bfb08
``` // The legacy PM CGPassManager discovers SCCs this way: for function in the source order tarjanSCC(function) // While the new PM CGSCCPassManager does: for function in the reversed source order [1] discover a reference graph SCC build call graph SCCs inside the reference graph SCC ``` In the common cases, reference graph ~= call graph, the new PM order is undesired because for `a | b | c` (3 independent functions), the new PM will process them in the reversed order: c, b, a. If `a <-> b <-> c`, we can see that `-print-after-all` will report the sole SCC as `scc: (c, b, a)`. This patch corrects the iteration order. The discovered SCC order will match the legacy PM in the common cases. For some tests (`Transforms/Inline/cgscc-*.ll` and `unittests/Analysis/CGSCCPassManagerTest.cpp`), the behaviors are dependent on the SCC discovery order and there are too many check lines for the particular order. This patch simply reverses the function order to avoid changing too many check lines. Differential Revision: https://reviews.llvm.org/D90566
39 lines
926 B
LLVM
39 lines
926 B
LLVM
; RUN: opt -disable-output -passes=print-lcg %s 2>&1 | FileCheck %s
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;
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; Aliased function should be reachable in CGSCC.
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target triple = "x86_64-grtev4-linux-gnu"
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; CHECK: Edges in function: foo
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; CHECK: Edges in function: bar
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; CHECK: Edges in function: baz
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; CHECK: RefSCC with 1 call SCCs:
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; CHECK-NEXT: SCC with 1 functions:
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; CHECK-NEXT: foo
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; CHECK-EMPTY:
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; CHECK: RefSCC with 1 call SCCs:
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; CHECK-NEXT: SCC with 1 functions:
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; CHECK-NEXT: bar
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; CHECK-NOT: baz
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@alias1 = weak dso_local alias i8* (i8*), i8* (i8*)* @foo
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define dso_local i8* @foo(i8* %returned) {
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ret i8* %returned
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}
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@alias2 = weak dso_local alias i8* (i8*), i8* (i8*)* @bar
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define internal i8* @bar(i8* %returned) {
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ret i8* %returned
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}
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; Internal alias is not reachable.
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@alias3 = internal alias i8* (i8*), i8* (i8*)* @baz
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define internal i8* @baz(i8* %returned) {
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ret i8* %returned
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}
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