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https://github.com/c64scene-ar/llvm-6502.git
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5b5782c20e
Summary: In RewriteStatepointsForGC pass, we create a gc_relocate intrinsic for each relocated pointer, and the gc_relocate has the same type with the pointer. During the creation of gc_relocate intrinsic, llvm requires to mangle its type. However, llvm does not support mangling of all possible types. RewriteStatepointsForGC will hit an assertion failure when it tries to create a gc_relocate for pointer to vector of pointers because mangling for vector of pointers is not supported. This patch changes the way RewriteStatepointsForGC pass creates gc_relocate. For each relocated pointer, we erase the type of pointers and create an unified gc_relocate of type i8 addrspace(1)*. Then a bitcast is inserted to convert the gc_relocate to the correct type. In this way, gc_relocate does not need to deal with different types of pointers and the unsupported type mangling is no longer a problem. This change would also ease further merge when LLVM erases types of pointers and introduces an unified pointer type. Some minor changes are also introduced to gc_relocate related part in InstCombineCalls, CodeGenPrepare, and Verifier accordingly. Patch by Chen Li! Reviewers: reames, AndyAyers, sanjoy Reviewed By: sanjoy Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D9592 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237009 91177308-0d34-0410-b5e6-96231b3b80d8
67 lines
2.1 KiB
LLVM
67 lines
2.1 KiB
LLVM
; RUN: opt -rewrite-statepoints-for-gc -S < %s | FileCheck %s
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declare void @consume(...)
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; Test to make sure we destroy LCSSA's single entry phi nodes before
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; running liveness
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define void @test6(i64 addrspace(1)* %obj) gc "statepoint-example" {
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; CHECK-LABEL: @test6
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entry:
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br label %next
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next:
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; CHECK-LABEL: next:
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; CHECK-NEXT: gc.statepoint
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; CHECK-NEXT: gc.relocate
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; CHECK-NEXT: bitcast
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; CHECK-NEXT: @consume(i64 addrspace(1)* %obj.relocated.casted)
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; CHECK-NEXT: @consume(i64 addrspace(1)* %obj.relocated.casted)
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%obj2 = phi i64 addrspace(1)* [ %obj, %entry ]
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call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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call void (...) @consume(i64 addrspace(1)* %obj2)
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call void (...) @consume(i64 addrspace(1)* %obj)
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ret void
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}
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declare void @some_call(i64 addrspace(1)*)
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; Need to delete unreachable gc.statepoint call
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define void @test7() gc "statepoint-example" {
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; CHECK-LABEL: test7
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; CHECK-NOT: gc.statepoint
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ret void
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unreached:
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%obj = phi i64 addrspace(1)* [null, %unreached]
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call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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call void (...) @consume(i64 addrspace(1)* %obj)
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br label %unreached
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}
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; Need to delete unreachable gc.statepoint invoke - tested seperately given
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; a correct implementation could only remove the instructions, not the block
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define void @test8() gc "statepoint-example" {
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; CHECK-LABEL: test8
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; CHECK-NOT: gc.statepoint
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ret void
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unreached:
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invoke i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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to label %normal_return unwind label %exceptional_return
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normal_return: ; preds = %entry
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ret void
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exceptional_return: ; preds = %entry
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%landing_pad4 = landingpad { i8*, i32 } personality i32 ()* undef
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cleanup
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ret void
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}
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declare void @foo()
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; Bound the last check-not
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; CHECK-LABEL: @foo
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declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()*, i32, i32, ...)
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