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[fast-isel] Add support for indirect branches.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150014 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2012-02-07 23:56:08 +00:00
parent 30d409ca09
commit 60c8fa6bb9
2 changed files with 30 additions and 0 deletions
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13
lib/Target/ARM/ARMFastISel.cpp
View File

@ -157,6 +157,7 @@ class ARMFastISel : public FastISel {
bool SelectLoad(const Instruction *I);
bool SelectStore(const Instruction *I);
bool SelectBranch(const Instruction *I);
bool SelectIndirectBr(const Instruction *I);
bool SelectCmp(const Instruction *I);
bool SelectFPExt(const Instruction *I);
bool SelectFPTrunc(const Instruction *I);
@ -1350,6 +1351,16 @@ bool ARMFastISel::SelectBranch(const Instruction *I) {
return true;
}
bool ARMFastISel::SelectIndirectBr(const Instruction *I) {
unsigned AddrReg = getRegForValue(I->getOperand(0));
if (AddrReg == 0) return false;
unsigned Opc = isThumb2 ? ARM::tBRIND : ARM::BX;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc))
.addReg(AddrReg));
return true;
}
bool ARMFastISel::ARMEmitCmp(const Value *Src1Value, const Value *Src2Value,
bool isZExt) {
Type *Ty = Src1Value->getType();
@ -2468,6 +2479,8 @@ bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
return SelectStore(I);
case Instruction::Br:
return SelectBranch(I);
case Instruction::IndirectBr:
return SelectIndirectBr(I);
case Instruction::ICmp:
case Instruction::FCmp:
return SelectCmp(I);

17
test/CodeGen/ARM/fast-isel-indirectbr.ll Normal file
View File

@ -0,0 +1,17 @@
; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=armv7-apple-ios | FileCheck %s --check-prefix=ARM
; RUN: llc < %s -O0 -fast-isel-abort -relocation-model=dynamic-no-pic -mtriple=thumbv7-apple-ios | FileCheck %s --check-prefix=THUMB
define void @t1(i8* %x) {
entry:
; ARM: t1
; THUMB: t1
br label %L0
L0:
br label %L1
L1:
indirectbr i8* %x, [ label %L0, label %L1 ]
; ARM: bx r0
; THUMB: mov pc, r0
}