55 lines
1.4 KiB
LLVM
55 lines
1.4 KiB
LLVM
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;; 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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