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9e6192bcdf
Have funcattrs expand all implied attributes into the IR. This expands the infrastructure from D100400, but for definitions not declarations this time. Somewhat subtly, this mostly isn't semantic. Because the accessors did the inference, any client which used the accessor was already getting the stronger result. Clients that directly checked presence of attributes (there are some), will see a stronger result now. The old behavior can end up quite confusing for two reasons: * Without this change, we have situations where function-attrs appears to fail when inferring an attribute (as seen by a human reading IR), but that consuming code will see that it should have been implied. As a human trying to sanity check test results and study IR for optimization possibilities, this is exceeding error prone and confusing. (I'll note that I wasted several hours recently because of this.) * We can have transforms which trigger without the IR appearing (on inspection) to meet the preconditions. This change doesn't prevent this from happening (as the accessors still involve multiple checks), but it should make it less frequent. I'd argue in favor of deleting the extra checks out of the accessors after this lands, but I want that in it's own review as a) it's purely stylistic, and b) I already know there's some disagreement. Once this lands, I'm also going to do a cleanup change which will delete some now redundant duplicate predicates in the inference code, but again, that deserves to be a change of it's own. Differential Revision: https://reviews.llvm.org/D100226
107 lines
3.2 KiB
LLVM
107 lines
3.2 KiB
LLVM
; Make sure that even without some external devirtualization iteration tool,
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; the CGSCC pass manager correctly observes and re-visits SCCs that change
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; structure due to devirtualization. We trigger devirtualization here with GVN
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; which forwards a store through a load and to an indirect call.
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;
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; RUN: opt -aa-pipeline=basic-aa -passes='cgscc(function-attrs)' -S < %s | FileCheck %s --check-prefix=BEFORE
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; RUN: opt -aa-pipeline=basic-aa -passes='cgscc(function-attrs,function(gvn))' -S < %s | FileCheck %s --check-prefix=AFTER
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;
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; Also check that adding an extra CGSCC pass after the function update but
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; without requiring the outer manager to iterate doesn't break any invariant.
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; RUN: opt -aa-pipeline=basic-aa -passes='cgscc(function-attrs,function(gvn),function-attrs)' -S < %s | FileCheck %s --check-prefix=AFTER
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declare void @readnone() nofree nosync readnone
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declare void @unknown()
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; The @test1_* checks that if we refine an indirect call to a direct call and
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; in the process change the very structure of the call graph we also revisit
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; that component of the graph and do so in an up-to-date fashion.
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; BEFORE: define void @test1_a1() {
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; AFTER: define void @test1_a1() {
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define void @test1_a1() {
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%fptr = alloca void()*
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store void()* @test1_b2, void()** %fptr
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store void()* @test1_b1, void()** %fptr
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%f = load void()*, void()** %fptr
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call void %f()
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ret void
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}
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; BEFORE: define void @test1_b1() {
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; AFTER: define void @test1_b1() {
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define void @test1_b1() {
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call void @unknown()
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call void @test1_a1()
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ret void
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}
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; BEFORE: define void @test1_a2() {
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; AFTER: define void @test1_a2() #0 {
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define void @test1_a2() {
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%fptr = alloca void()*
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store void()* @test1_b1, void()** %fptr
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store void()* @test1_b2, void()** %fptr
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%f = load void()*, void()** %fptr
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call void %f()
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ret void
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}
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; BEFORE: define void @test1_b2() {
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; AFTER: define void @test1_b2() #0 {
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define void @test1_b2() {
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call void @readnone()
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call void @test1_a2()
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ret void
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}
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; The @test2_* set of functions exercise a case where running function passes
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; introduces a new post-order relationship that was not present originally and
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; makes sure we walk across the SCCs in that order.
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; CHECK: define void @test2_a() {
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define void @test2_a() {
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call void @test2_b1()
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call void @test2_b2()
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call void @test2_b3()
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call void @unknown()
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ret void
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}
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; CHECK: define void @test2_b1() #0 {
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define void @test2_b1() {
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%fptr = alloca void()*
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store void()* @test2_a, void()** %fptr
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store void()* @readnone, void()** %fptr
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%f = load void()*, void()** %fptr
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call void %f()
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ret void
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}
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; CHECK: define void @test2_b2() #0 {
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define void @test2_b2() {
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%fptr = alloca void()*
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store void()* @test2_a, void()** %fptr
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store void()* @test2_b2, void()** %fptr
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store void()* @test2_b3, void()** %fptr
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store void()* @test2_b1, void()** %fptr
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%f = load void()*, void()** %fptr
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call void %f()
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ret void
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}
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; CHECK: define void @test2_b3() #0 {
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define void @test2_b3() {
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%fptr = alloca void()*
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store void()* @test2_a, void()** %fptr
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store void()* @test2_b2, void()** %fptr
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store void()* @test2_b3, void()** %fptr
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store void()* @test2_b1, void()** %fptr
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%f = load void()*, void()** %fptr
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call void %f()
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ret void
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}
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; CHECK: attributes #0 = { nofree nosync readnone }
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