1; REQUIRES: asserts
2; RUN: llc < %s -mtriple=thumbv7-apple-ios -arm-atomic-cfg-tidy=0 -stats 2>&1 | FileCheck %s
3
4; If ARMBaseInstrInfo::AnalyzeBlocks returns the wrong value, which was possible
5; for blocks with indirect branches, the IfConverter could end up deleting
6; blocks that were the destinations of indirect branches, leaving branches to
7; nowhere.
8; <rdar://problem/14464830>
9
10define i32 @preserve_blocks(i32 %x) {
11; preserve_blocks:
12; CHECK: Block address taken
13; CHECK: %ibt1
14; CHECK: movs r0, #2
15; CHECK: Block address taken
16; CHECK: %ibt2
17; CHECK: movs r0, #1
18; CHECK-NOT: Address of block that was removed by CodeGen
19
20; Separate bug. There are no valid diamonds to if-convert in this file.
21; There was a bug in the if-conversion code that would if-convert a false
22; diamond where one side had a return and the other had an indirect branch.
23; Make sure no diamond conversions occurred while compiling this file.
24; CHECK: Statistics Collected
25; CHECK-NOT: 1 ifcvt          - Number of diamond if-conversions performed
26entry:
27  %c2 = icmp slt i32 %x, 3
28  %blockaddr = select i1 %c2, i8* blockaddress(@preserve_blocks, %ibt1), i8* blockaddress(@preserve_blocks, %ibt2)
29  %c1 = icmp eq i32 %x, 0
30  br i1 %c1, label %pre_ib, label %nextblock
31
32nextblock:
33  ret i32 3
34
35ibt1:
36  ret i32 2
37
38ibt2:
39  ret i32 1
40
41pre_ib:
42  indirectbr i8* %blockaddr, [ label %ibt1, label %ibt2 ]
43}
44