61785ffcfc
This PR replaces `isMachineBlockAddressTaken` by `hasAddressTaken` to include blocks which have their IR address taken as well. These blocks are also not removable since their predecessors' terminators do not directly point to the block.
55 lines
1.4 KiB
LLVM
55 lines
1.4 KiB
LLVM
;; This test verifies that -gc-empty-basic-blocks removes regular empty blocks
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;; but does not remove empty blocks which have their address taken.
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; RUN: llc < %s -mtriple=x86_64 -O0 -gc-empty-basic-blocks | FileCheck %s
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;; This function has a regular empty block.
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define void @foo(i1 zeroext %0) nounwind {
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br i1 %0, label %2, label %empty_block
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; CHECK: .text
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; CHECK-LABEL: foo:
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; CHECK: jne .LBB0_1
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; CHECK-NEXT: jmp .LBB0_3
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2: ; preds = %1
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%3 = call i32 @baz()
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br label %4
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; CHECK-LABEL: .LBB0_1:
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; CHECK: jmp .LBB0_3
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empty_block: ; preds = %1
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unreachable
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; CHECK-NOT: %empty_block
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; CHECK-NOT: .LBB0_2
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4: ; preds = %2, %empty_block
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ret void
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; CHECK-LABEL: .LBB0_3:
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; CHECK: retq
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}
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;; This function has an empty block which has its address taken. Check that it
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;; is not removed by -gc-empty-basic-blocks.
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define void @bar(i1 zeroext %0) nounwind {
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entry:
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%1 = select i1 %0, ptr blockaddress(@bar, %empty_block), ptr blockaddress(@bar, %bb2) ; <ptr> [#uses=1]
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indirectbr ptr %1, [label %empty_block, label %bb2]
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; CHECK-LABEL: bar:
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empty_block: ; preds = %entry
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unreachable
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; CHECK-LABEL: .LBB1_1: # %empty_block
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bb2: ; preds = %entry
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%2 = call i32 @baz()
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ret void
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}
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declare i32 @baz()
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