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when they are call edges at the leaf but may (transitively) be reached via ref edges. It turns out there is a simple rule: insert everything as a ref edge which is a safe conservative default. Then we let the existing update logic handle promoting some of those to call edges. Note that it would be fairly cheap to make these call edges right away if that is desirable by testing whether there is some existing call path from the source to the target. It just seemed like slightly more complexity in this code path that isn't strictly necessary. If anyone feels strongly about handling this differently I'm happy to change it. llvm-svn: 290649
185 lines
4.8 KiB
LLVM
185 lines
4.8 KiB
LLVM
; RUN: opt < %s -aa-pipeline=basic-aa -passes='cgscc(function-attrs,inline)' -S | FileCheck %s
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; This test runs the inliner and the function attribute deduction. It ensures
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; that when the inliner mutates the call graph it correctly updates the CGSCC
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; iteration so that we can compute refined function attributes. In this way it
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; is leveraging function attribute computation to observe correct call graph
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; updates.
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; Boring unknown external function call.
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; CHECK: declare void @unknown()
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declare void @unknown()
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; Sanity check: this should get annotated as readnone.
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; CHECK: Function Attrs: readnone
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; CHECK-NEXT: declare void @readnone()
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declare void @readnone() readnone
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; The 'test1_' prefixed functions are designed to trigger forming a new direct
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; call in the inlined body of the function. After that, we form a new SCC and
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; using that can deduce precise function attrs.
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; This function should no longer exist.
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; CHECK-NOT: @test1_f()
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define internal void @test1_f(void()* %p) {
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entry:
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call void %p()
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ret void
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}
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; This function should have had 'readnone' deduced for its SCC.
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; CHECK: Function Attrs: noinline readnone
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; CHECK-NEXT: define void @test1_g()
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define void @test1_g() noinline {
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entry:
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call void @test1_f(void()* @test1_h)
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ret void
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}
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; This function should have had 'readnone' deduced for its SCC.
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; CHECK: Function Attrs: noinline readnone
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; CHECK-NEXT: define void @test1_h()
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define void @test1_h() noinline {
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entry:
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call void @test1_g()
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call void @readnone()
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ret void
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}
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; The 'test2_' prefixed functions are designed to trigger forming a new direct
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; call due to RAUW-ing the returned value of a called function into the caller.
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; This too should form a new SCC which can then be reasoned about to compute
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; precise function attrs.
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; This function should no longer exist.
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; CHECK-NOT: @test2_f()
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define internal void()* @test2_f() {
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entry:
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ret void()* @test2_h
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}
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; This function should have had 'readnone' deduced for its SCC.
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; CHECK: Function Attrs: noinline readnone
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; CHECK-NEXT: define void @test2_g()
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define void @test2_g() noinline {
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entry:
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%p = call void()* @test2_f()
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call void %p()
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ret void
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}
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; This function should have had 'readnone' deduced for its SCC.
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; CHECK: Function Attrs: noinline readnone
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; CHECK-NEXT: define void @test2_h()
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define void @test2_h() noinline {
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entry:
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call void @test2_g()
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call void @readnone()
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ret void
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}
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; The 'test3_' prefixed functions are designed to inline in a way that causes
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; call sites to become trivially dead during the middle of inlining callsites of
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; a single function to make sure that the inliner does not get confused by this
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; pattern.
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; CHECK-NOT: @test3_maybe_unknown(
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define internal void @test3_maybe_unknown(i1 %b) {
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entry:
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br i1 %b, label %then, label %exit
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then:
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call void @unknown()
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br label %exit
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exit:
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ret void
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}
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; CHECK-NOT: @test3_f(
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define internal i1 @test3_f() {
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entry:
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ret i1 false
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}
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; CHECK-NOT: @test3_g(
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define internal i1 @test3_g(i1 %b) {
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entry:
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br i1 %b, label %then1, label %if2
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then1:
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call void @test3_maybe_unknown(i1 true)
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br label %if2
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if2:
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%f = call i1 @test3_f()
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br i1 %f, label %then2, label %exit
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then2:
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call void @test3_maybe_unknown(i1 true)
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br label %exit
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exit:
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ret i1 false
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}
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; FIXME: Currently the inliner doesn't successfully mark this as readnone
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; because while it simplifies trivially dead CFGs when inlining callees it
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; doesn't simplify the caller's trivially dead CFG and so we end with a dead
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; block calling @unknown.
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; CHECK-NOT: Function Attrs: readnone
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; CHECK: define void @test3_h()
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define void @test3_h() {
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entry:
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%g = call i1 @test3_g(i1 false)
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br i1 %g, label %then, label %exit
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then:
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call void @test3_maybe_unknown(i1 true)
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br label %exit
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exit:
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call void @test3_maybe_unknown(i1 false)
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ret void
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}
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; The 'test4_' prefixed functions are designed to trigger forming a new direct
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; call in the inlined body of the function similar to 'test1_'. However, after
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; that we continue to inline another edge of the graph forcing us to do a more
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; interesting call graph update for the new call edge. Eventually, we still
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; form a new SCC and should use that can deduce precise function attrs.
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; This function should have had 'readnone' deduced for its SCC.
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; CHECK: Function Attrs: noinline readnone
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; CHECK-NEXT: define void @test4_f1()
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define void @test4_f1() noinline {
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entry:
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call void @test4_h()
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ret void
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}
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; CHECK-NOT: @test4_f2
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define internal void @test4_f2() {
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entry:
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call void @test4_f1()
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ret void
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}
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; CHECK-NOT: @test4_g
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define internal void @test4_g(void()* %p) {
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entry:
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call void %p()
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ret void
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}
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; This function should have had 'readnone' deduced for its SCC.
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; CHECK: Function Attrs: noinline readnone
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; CHECK-NEXT: define void @test4_h()
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define void @test4_h() noinline {
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entry:
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call void @test4_g(void()* @test4_f2)
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ret void
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}
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