25ec1a3e60
Summary: This is a step towards using operand bundles to carry deopt state till RewriteStatepointsForGC. The change adds a flag to RewriteStatepointsForGC that teaches it to pick up deopt state from a `"deopt"` operand bundle attached to the `call` or `invoke` it is wrapping. The command line flag added, `-rs4gc-use-deopt-bundles`, will only exist for a short while. Once we are able to pipe deopt bundle state through the full optimization pipeline without problems, we will "constant fold" `-rs4gc-use-deopt-bundles` to `true`. Reviewers: swaroop.sridhar, reames Subscribers: llvm-commits, sanjoy Differential Revision: http://reviews.llvm.org/D13372 llvm-svn: 250489
82 lines
2.4 KiB
LLVM
82 lines
2.4 KiB
LLVM
; RUN: opt -rewrite-statepoints-for-gc -rs4gc-use-deopt-bundles -S < %s | FileCheck %s
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; A null test of a single value
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define i1 @test(i8 addrspace(1)* %p, i1 %rare) gc "statepoint-example" {
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; CHECK-LABEL: @test
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entry:
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%cond = icmp eq i8 addrspace(1)* %p, null
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br i1 %rare, label %safepoint, label %continue, !prof !0
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safepoint: ; preds = %entry
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call void @safepoint() [ "deopt"() ]
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br label %continue
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continue: ; preds = %safepoint, %entry
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; CHECK-LABEL: continue:
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; CHECK: phi
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; CHECK-DAG: [ %p.relocated, %safepoint ]
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; CHECK-DAG: [ %p, %entry ]
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; CHECK: %cond = icmp
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; CHECK: br i1 %cond
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; Comparing two pointers
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br i1 %cond, label %taken, label %untaken
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taken: ; preds = %continue
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ret i1 true
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untaken: ; preds = %continue
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ret i1 false
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}
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define i1 @test2(i8 addrspace(1)* %p, i8 addrspace(1)* %q, i1 %rare) gc "statepoint-example" {
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; CHECK-LABEL: @test2
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entry:
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%cond = icmp eq i8 addrspace(1)* %p, %q
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br i1 %rare, label %safepoint, label %continue, !prof !0
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safepoint: ; preds = %entry
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call void @safepoint() [ "deopt"() ]
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br label %continue
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continue: ; preds = %safepoint, %entry
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; CHECK-LABEL: continue:
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; CHECK: phi
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; CHECK-DAG: [ %q.relocated, %safepoint ]
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; CHECK-DAG: [ %q, %entry ]
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; CHECK: phi
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; CHECK-DAG: [ %p.relocated, %safepoint ]
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; CHECK-DAG: [ %p, %entry ]
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; CHECK: %cond = icmp
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; CHECK: br i1 %cond
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; Sanity check that nothing bad happens if already last instruction
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; before terminator
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br i1 %cond, label %taken, label %untaken
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taken: ; preds = %continue
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ret i1 true
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untaken: ; preds = %continue
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ret i1 false
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}
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define i1 @test3(i8 addrspace(1)* %p, i8 addrspace(1)* %q, i1 %rare) gc "statepoint-example" {
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; CHECK-LABEL: @test3
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; CHECK: gc.statepoint
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; CHECK: %cond = icmp
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; CHECK: br i1 %cond
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entry:
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call void @safepoint() [ "deopt"() ]
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%cond = icmp eq i8 addrspace(1)* %p, %q
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br i1 %cond, label %taken, label %untaken
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taken: ; preds = %entry
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ret i1 true
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untaken: ; preds = %entry
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ret i1 false
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}
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declare void @safepoint()
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!0 = !{!"branch_weights", i32 1, i32 10000}
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