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llvm-project/llvm/test/Transforms/RewriteStatepointsForGC/base-pointers-12.ll

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[RS4GC] Clamp UseDeoptBundles to true and update tests The full diff for the test directory may be hard to read because of the filename clash; so here's all that happened as far as the tests are concerned: ``` cd test/Transforms/RewriteStatepointsForGC git rm *ll git mv deopt-bundles/* ./ rmdir deopt-bundles find . -name '*.ll' | xargs gsed -i 's/-rs4gc-use-deopt-bundles //g' ``` llvm-svn: 259129
2016-01-29 08:28:57 +08:00
; RUN: opt < %s -rewrite-statepoints-for-gc -spp-print-base-pointers -S 2>&1 | FileCheck %s
[RS4GC] Fix crash in the case that a live variable has a constant base. Summary: Previously, RS4GC crashed in CreateGCRelocates() because it assumed that every base is also in the array of live variables, which isn't true if a live variable has a constant base. This change fixes the crash by making sure CreateGCRelocates() won't try to relocate a live variable with a constant base. This would be unnecessary anyway because anything with a constant base won't move. Reviewers: reames Subscribers: llvm-commits, sanjoy Differential Revision: http://reviews.llvm.org/D15556 llvm-svn: 256252
2015-12-23 00:50:44 +08:00
[RewriteStatepointsForGC] All constant should have null base pointer Currently we consider that each constant has itself as a base value. I.e "base(const) = const". This introduces couple of problems when we are trying to avoid reporting constants in statepoint live sets: 1. When querying "base( phi(const1, const2) )" we will get "phi(const1, const2)" as a base pointer. Since it's not a constant we will record it in a stack map. However on practice we don't want this to happen (constant are never relocated). 2. base( phi(const, gc ptr) ) = phi( const, base(gc ptr) ). This particular case imposes challenge on our runtime - we don't expect to see constant base pointers other than null. This problems can be avoided by treating all constant as if they were derived from null pointer base. I.e in a first case we will not include constant pointer in a stack map at all. In a second case we will get "phi(null, base(gc ptr))" as a base pointer which is a lot more convenient. Differential Revision: http://reviews.llvm.org/D20584 llvm-svn: 270993
2016-05-27 21:13:59 +08:00
; CHECK: derived %select base null
[RS4GC] Fix crash in the case that a live variable has a constant base. Summary: Previously, RS4GC crashed in CreateGCRelocates() because it assumed that every base is also in the array of live variables, which isn't true if a live variable has a constant base. This change fixes the crash by making sure CreateGCRelocates() won't try to relocate a live variable with a constant base. This would be unnecessary anyway because anything with a constant base won't move. Reviewers: reames Subscribers: llvm-commits, sanjoy Differential Revision: http://reviews.llvm.org/D15556 llvm-svn: 256252
2015-12-23 00:50:44 +08:00
@global = external addrspace(1) global i8
define i8 @test(i1 %cond) gc "statepoint-example" {
%derived1 = getelementptr i8, i8 addrspace(1)* @global, i64 1
%derived2 = getelementptr i8, i8 addrspace(1)* @global, i64 2
%select = select i1 %cond, i8 addrspace(1)* %derived1, i8 addrspace(1)* %derived2
[RS4GC] Clamp UseDeoptBundles to true and update tests The full diff for the test directory may be hard to read because of the filename clash; so here's all that happened as far as the tests are concerned: ``` cd test/Transforms/RewriteStatepointsForGC git rm *ll git mv deopt-bundles/* ./ rmdir deopt-bundles find . -name '*.ll' | xargs gsed -i 's/-rs4gc-use-deopt-bundles //g' ``` llvm-svn: 259129
2016-01-29 08:28:57 +08:00
call void @extern()
[RS4GC] Fix crash in the case that a live variable has a constant base. Summary: Previously, RS4GC crashed in CreateGCRelocates() because it assumed that every base is also in the array of live variables, which isn't true if a live variable has a constant base. This change fixes the crash by making sure CreateGCRelocates() won't try to relocate a live variable with a constant base. This would be unnecessary anyway because anything with a constant base won't move. Reviewers: reames Subscribers: llvm-commits, sanjoy Differential Revision: http://reviews.llvm.org/D15556 llvm-svn: 256252
2015-12-23 00:50:44 +08:00
; CHECK-NOT: relocate
; CHECK: %load = load i8, i8 addrspace(1)* %select
%load = load i8, i8 addrspace(1)* %select
ret i8 %load
}
declare void @extern() gc "statepoint-example"
Fix safepoint intrinsic signatures in test. Should bring back the bots after r256443. llvm-svn: 256450
2015-12-26 19:40:48 +08:00
declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)