derek.holloway
7502bf64a4
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40 lines
1.1 KiB
LLVM
40 lines
1.1 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mattr=+retpoline | FileCheck %s
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;
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; verify that blocks are NOT marked as "Block address taken" when the
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; BlockAddress constant has no users (was optimized away).
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;
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; With retpoline enabled, the indirectbr is replaced with direct comparisons
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; against constant integer values. The BlockAddress constants in the global
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; array become unused (constant-folded to integers), so the blocks should NOT
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; be marked as address-taken.
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@targets = internal constant [4 x ptr] [
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ptr blockaddress(@test_stale_addresstaken, %bb0),
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ptr blockaddress(@test_stale_addresstaken, %bb1),
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ptr blockaddress(@test_stale_addresstaken, %bb2),
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ptr blockaddress(@test_stale_addresstaken, %bb3)
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]
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define i32 @test_stale_addresstaken(i32 %idx) {
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entry:
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%ptr = getelementptr [4 x ptr], ptr @targets, i32 0, i32 %idx
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%dest = load ptr, ptr %ptr
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indirectbr ptr %dest, [label %bb0, label %bb1, label %bb2, label %bb3]
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; CHECK-LABEL: test_stale_addresstaken:
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; CHECK-NOT: Block address taken
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; CHECK-LABEL: .Lfunc_end0:
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bb0:
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ret i32 0
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bb1:
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ret i32 1
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bb2:
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ret i32 2
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bb3:
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ret i32 3
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}
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