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; RUN: llc < %s -mtriple=thumbv7-apple-ios -arm-atomic-cfg-tidy=0 | FileCheck %s
; If ARMBaseInstrInfo::AnalyzeBlocks returns the wrong value, which was possible
; for blocks with indirect branches, the IfConverter could end up deleting
; blocks that were the destinations of indirect branches, leaving branches to
; nowhere.
; <rdar://problem/14464830>
define i32 @preserve_blocks(i32 %x) {
; preserve_blocks:
; CHECK: Block address taken
; CHECK: movs r0, #2
; CHECK: movs r0, #1
; CHECK-NOT: Address of block that was removed by CodeGen
entry:
%c2 = icmp slt i32 %x, 3
%blockaddr = select i1 %c2, i8* blockaddress(@preserve_blocks, %ibt1), i8* blockaddress(@preserve_blocks, %ibt2)
%c1 = icmp eq i32 %x, 0
br i1 %c1, label %pre_ib, label %nextblock
nextblock:
ret i32 3
ibt1:
ret i32 2
ibt2:
ret i32 1
pre_ib:
indirectbr i8* %blockaddr, [ label %ibt1, label %ibt2 ]
}
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