1 ; RUN: llc < %s -mtriple=thumbv7-apple-ios -arm-atomic-cfg-tidy=0 | FileCheck %s 2 3 ; If ARMBaseInstrInfo::AnalyzeBlocks returns the wrong value, which was possible 4 ; for blocks with indirect branches, the IfConverter could end up deleting 5 ; blocks that were the destinations of indirect branches, leaving branches to 6 ; nowhere. 7 ; <rdar://problem/14464830> 8 9 define i32 @preserve_blocks(i32 %x) { 10 ; preserve_blocks: 11 ; CHECK: Block address taken 12 ; CHECK: movs r0, #2 13 ; CHECK: movs r0, #1 14 ; CHECK-NOT: Address of block that was removed by CodeGen 15 entry: 16 %c2 = icmp slt i32 %x, 3 17 %blockaddr = select i1 %c2, i8* blockaddress(@preserve_blocks, %ibt1), i8* blockaddress(@preserve_blocks, %ibt2) 18 %c1 = icmp eq i32 %x, 0 19 br i1 %c1, label %pre_ib, label %nextblock 20 21 nextblock: 22 ret i32 3 23 24 ibt1: 25 ret i32 2 26 27 ibt2: 28 ret i32 1 29 30 pre_ib: 31 indirectbr i8* %blockaddr, [ label %ibt1, label %ibt2 ] 32 } 33
