[llvm-commits] [llvm] r150014 - in /llvm/trunk: lib/Target/ARM/ARMFastISel.cpp test/CodeGen/ARM/fast-isel-indirectbr.ll

[Chad Rosier]

Author: mcrosier
Date: Tue Feb  7 17:56:08 2012
New Revision: 150014

URL: http://llvm.org/viewvc/llvm-project?rev=150014&view=rev
Log:
[fast-isel] Add support for indirect branches.

Added:
    llvm/trunk/test/CodeGen/ARM/fast-isel-indirectbr.ll
Modified:
    llvm/trunk/lib/Target/ARM/ARMFastISel.cpp

Modified: llvm/trunk/lib/Target/ARM/ARMFastISel.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMFastISel.cpp?rev=150014&r1=150013&r2=150014&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMFastISel.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMFastISel.cpp Tue Feb  7 17:56:08 2012
@@ -157,6 +157,7 @@
     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 @@
   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 @@
       return SelectStore(I);
     case Instruction::Br:
       return SelectBranch(I);
+    case Instruction::IndirectBr:
+      return SelectIndirectBr(I);
     case Instruction::ICmp:
     case Instruction::FCmp:
       return SelectCmp(I);

Added: llvm/trunk/test/CodeGen/ARM/fast-isel-indirectbr.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/fast-isel-indirectbr.ll?rev=150014&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/ARM/fast-isel-indirectbr.ll (added)
+++ llvm/trunk/test/CodeGen/ARM/fast-isel-indirectbr.ll Tue Feb  7 17:56:08 2012
@@ -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
+}