| Tim Northover | b4ddc08 | 2014-05-30 10:09:59 +0000 | [diff] [blame] | 1 | ; RUN: llc < %s -mtriple=thumbv7-apple-ios -arm-atomic-cfg-tidy=0 | FileCheck %s |
| Lang Hames | 24864fe | 2013-07-19 23:52:47 +0000 | [diff] [blame] | 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 | } |