derek.holloway
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105 lines
2.9 KiB
LLVM
105 lines
2.9 KiB
LLVM
; This test tries to ensure that the inliner successfully invalidates function
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; analyses after inlining into the function body.
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;
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; The strategy for these tests is to compute domtree over all the functions,
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; then run the inliner, and then verify the domtree. Then we can arrange the
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; inline to disturb the domtree (easy) and detect any stale cached entries in
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; the verifier. We do the initial computation both *inside* the CGSCC walk and
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; in a pre-step to make sure both work.
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;
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; RUN: opt < %s -passes='function(require<domtree>),cgscc(inline,function(verify<domtree>))' -S | FileCheck %s
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; RUN: opt < %s -passes='cgscc(function(require<domtree>),inline,function(verify<domtree>))' -S | FileCheck %s
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; An external function used to control branches.
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declare i1 @flag()
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; CHECK-LABEL: declare i1 @flag()
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; The utility function with interesting control flow that gets inlined below to
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; perturb the dominator tree.
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define internal void @callee() {
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; CHECK-LABEL: @callee
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entry:
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%ptr = alloca i8
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%flag = call i1 @flag()
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br i1 %flag, label %then, label %else
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then:
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store volatile i8 42, ptr %ptr
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br label %return
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else:
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store volatile i8 -42, ptr %ptr
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br label %return
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return:
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ret void
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}
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; The 'test1_' prefixed functions test the basic scenario of inlining
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; destroying dominator tree.
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define void @test1_caller() {
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; CHECK-LABEL: define void @test1_caller()
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entry:
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call void @callee()
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; CHECK-NOT: @callee
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ret void
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; CHECK: ret void
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}
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; The 'test2_' prefixed functions test the scenario of not inlining preserving
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; dominators.
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define void @test2_caller() {
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; CHECK-LABEL: define void @test2_caller()
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entry:
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call void @callee() noinline
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; CHECK: call void @callee
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ret void
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; CHECK: ret void
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}
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; The 'test3_' prefixed functions test the scenario of not inlining preserving
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; dominators after splitting an SCC into two smaller SCCs.
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; This function gets visited first and we end up inlining everything we
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; can into this routine. That splits test3_g into a separate SCC that is enqued
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; for later processing.
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define void @test3_f() {
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; CHECK-LABEL: define void @test3_f()
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entry:
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; Create the first edge in the SCC cycle.
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call void @test3_g()
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; CHECK-NOT: @test3_g()
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; CHECK: call void @test3_f()
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; Pull interesting CFG into this function.
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call void @callee()
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; CHECK-NOT: call void @callee()
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ret void
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; CHECK: ret void
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}
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; This function ends up split into a separate SCC, which can cause its analyses
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; to become stale if the splitting doesn't properly invalidate things. Also, as
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; a consequence of being split out, test3_f is too large to inline by the time
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; we get here.
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define void @test3_g() {
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; CHECK-LABEL: define void @test3_g()
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entry:
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; Create the second edge in the SCC cycle.
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call void @test3_f()
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; CHECK: call void @test3_f()
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; Pull interesting CFG into this function.
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call void @callee()
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; CHECK-NOT: call void @callee()
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ret void
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; CHECK: ret void
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}
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