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: nounwind readnone
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; CHECK-NEXT: declare void @readnone()
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declare void @readnone() readnone nounwind
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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 nounwind 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 nounwind 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 nounwind 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 nounwind 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 nounwind 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 nounwind 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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