llvm.org GIT mirror llvm / release_38 test / CodeGen / ARM / indirectbr-3.ll
release_38

Tree @release_38 (Download .tar.gz)

indirectbr-3.ll @release_38raw · history · blame

; 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 ]
}