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When a block ends in an indirect branch, add its successors to the machine basic block.

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The CFG of the machine function needs to know that the targets of the indirect
branch are successors to the indirect branch.
<rdar://problem/12529625>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166448 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2012-10-22 23:30:04 +00:00
parent 3ed0316f75
commit 8f47fc8f00
2 changed files with 51 additions and 0 deletions
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5
lib/Target/ARM/ARMFastISel.cpp
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@ -1388,6 +1388,11 @@ bool ARMFastISel::SelectIndirectBr(const Instruction *I) {
unsigned Opc = isThumb2 ? ARM::tBRIND : ARM::BX;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc))
.addReg(AddrReg));
const IndirectBrInst *IB = cast<IndirectBrInst>(I);
for (unsigned i = 0, e = IB->getNumSuccessors(); i != e; ++i)
FuncInfo.MBB->addSuccessor(FuncInfo.MBBMap[IB->getSuccessor(i)]);
return true;
}

46
test/CodeGen/ARM/indirectbr-2.ll Normal file
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@ -0,0 +1,46 @@
; RUN: llc < %s -O0 -relocation-model=pic -mtriple=thumbv7-apple-ios | FileCheck %s
; <rdar://problem/12529625>
@foo = global i32 34879, align 4
@DWJumpTable2808 = global [2 x i32] [i32 sub (i32 ptrtoint (i8* blockaddress(@func, %14) to i32), i32 ptrtoint (i8* blockaddress(@func, %4) to i32)), i32 sub (i32 ptrtoint (i8* blockaddress(@func, %13) to i32), i32 ptrtoint (i8* blockaddress(@func, %4) to i32))]
@0 = internal constant [45 x i8] c"func XXXXXXXXXXX :: bb xxxxxxxxxxxxxxxxxxxx\0A\00"
; The indirect branch has the two destinations as successors. The lone PHI
; statement shouldn't be implicitly defined.
; CHECK: func:
; CHECK: Ltmp1: @ Block address taken
; CHECK-NOT: @ implicit-def: R0
; CHECK: @ 4-byte Reload
define i32 @func() nounwind ssp {
%1 = alloca i32, align 4
%2 = load i32* @foo, align 4
%3 = icmp eq i32 %2, 34879
br label %4
; <label>:4 ; preds = %0
%5 = zext i1 %3 to i32
%6 = mul i32 %5, 287
%7 = add i32 %6, 2
%8 = getelementptr [2 x i32]* @DWJumpTable2808, i32 0, i32 %5
%9 = load i32* %8
%10 = add i32 %9, ptrtoint (i8* blockaddress(@func, %4) to i32)
%11 = inttoptr i32 %10 to i8*
%12 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([45 x i8]* @0, i32 0, i32 0))
indirectbr i8* %11, [label %13, label %14]
; <label>:13 ; preds = %4
%tmp14 = phi i32 [ %7, %4 ]
store i32 23958, i32* @foo, align 4
%tmp15 = load i32* %1, align 4
%tmp16 = icmp eq i32 %tmp15, 0
%tmp17 = zext i1 %tmp16 to i32
%tmp21 = add i32 %tmp17, %tmp14
ret i32 %tmp21
; <label>:14 ; preds = %4
ret i32 42
}
declare i32 @printf(i8*, ...)