ae6a5c1d08
Just avoid crashing for now, we should be able to replace the blockaddresses themselves. BlockAddress::handleOperandChangeImpl assumes it can cast to Function. The verifier seems nonexistent and the langref isn't particularly explicit on what's allowed as a blockaddress operand. As far as I can tell bugpoint isn't doing anything to handle this. Something low level is broken with BlockAddress handling, demonstrated by reduce-functions-blockaddress-wrong-function.ll. The BasicBlock destructor of the deleted function is triggering replacement of blockaddresses for the kept function in some cases. I've only half debugged this but it seems like blockaddress is handled too-specially compared to other Constants. I have tentative patches to allow any constant to be a blockaddress input, but having the verifier check if it's really a function/block. https://reviews.llvm.org/D140909
49 lines
1.9 KiB
LLVM
49 lines
1.9 KiB
LLVM
; RUN: llvm-reduce --delta-passes=functions --test FileCheck --test-arg --check-prefixes=INTERESTING --test-arg %s --test-arg --input-file %s -o %t
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; RUN: FileCheck --check-prefixes=RESULT --input-file=%t %s
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; Make sure we don't crash on blockaddress
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; TODO: Should be able to replace the blockaddresses with null too
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; INTERESTING: @blockaddr.table
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; INTERESTING: @blockaddr.table.addrspacecast
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; RESULT: @blockaddr.table = private unnamed_addr constant [2 x ptr] [ptr blockaddress(@foo, %L1), ptr blockaddress(@foo, %L2)]
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; RESULT: @blockaddr.table.addrspacecast = private unnamed_addr constant [2 x ptr addrspace(1)] [ptr addrspace(1) addrspacecast (ptr blockaddress(@foo_addrspacecast, %L1) to ptr addrspace(1)), ptr addrspace(1) addrspacecast (ptr blockaddress(@foo_addrspacecast, %L2) to ptr addrspace(1))]
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@blockaddr.table = private unnamed_addr constant [2 x ptr] [ptr blockaddress(@foo, %L1), ptr blockaddress(@foo, %L2)]
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@blockaddr.table.addrspacecast = private unnamed_addr constant [2 x ptr addrspace(1)] [
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ptr addrspace(1) addrspacecast (ptr blockaddress(@foo_addrspacecast, %L1) to ptr addrspace(1)),
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ptr addrspace(1) addrspacecast (ptr blockaddress(@foo_addrspacecast, %L2) to ptr addrspace(1))
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]
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; RESULT: define i32 @foo(
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define i32 @foo(i64 %arg0) {
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entry:
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%gep = getelementptr inbounds [2 x ptr], ptr @blockaddr.table, i64 0, i64 %arg0
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%load = load ptr, ptr %gep, align 8
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indirectbr ptr %load, [label %L2, label %L1]
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L1:
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%phi = phi i32 [ 1, %L2 ], [ 2, %entry ]
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ret i32 %phi
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L2:
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br label %L1
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}
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; RESULT: define i32 @foo_addrspacecast(
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define i32 @foo_addrspacecast(i64 %arg0) {
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entry:
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%gep = getelementptr inbounds [2 x ptr addrspace(1)], ptr @blockaddr.table.addrspacecast, i64 0, i64 %arg0
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%load = load ptr addrspace(1), ptr %gep, align 8
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indirectbr ptr addrspace(1) %load, [label %L2, label %L1]
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L1:
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%phi = phi i32 [ 1, %L2 ], [ 2, %entry ]
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ret i32 %phi
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L2:
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br label %L1
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}
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