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Thumb jumptable support.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33568 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-01-27 02:29:45 +00:00
parent bcabbfc310
commit d85ac4d079
3 changed files with 32 additions and 3 deletions
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1
lib/Target/ARM/ARMAsmPrinter.cpp
View File

@ -647,6 +647,7 @@ void ARMAsmPrinter::printJTBlockOperand(const MachineInstr *MI, int OpNo) {
<< getFunctionNumber() << '_' << JTI << '_' << MO2.getImmedValue();
} else
printBasicBlockLabel(MBB, false, false);
if (i != e-1)
O << '\n';
}
}

10
lib/Target/ARM/ARMConstantIslandPass.cpp
View File

@ -352,7 +352,8 @@ unsigned ARMConstantIslands::GetInstSize(MachineInstr *MI) const {
return MI->getOperand(2).getImm();
case ARM::BR_JTr:
case ARM::BR_JTm:
case ARM::BR_JTadd: {
case ARM::BR_JTadd:
case ARM::tBR_JTr: {
// These are jumptable branches, i.e. a branch followed by an inlined
// jumptable. The size is 4 + 4 * number of entries.
unsigned JTI = MI->getOperand(MI->getNumOperands()-2).getJumpTableIndex();
@ -360,6 +361,13 @@ unsigned ARMConstantIslands::GetInstSize(MachineInstr *MI) const {
MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
assert(JTI < JT.size());
// Thumb instructions are 2 byte aligned, but JT entries are 4 byte
// 4 aligned. The assembler / linker may add 2 byte padding just before
// the JT entries. Use + 4 even for tBR_JTr to purposely over-estimate
// the size the jumptable.
// FIXME: If we know the size of the function is less than (1 << 16) *2
// bytes, we can use 16-bit entries instead. Then there won't be an
// alignment issue.
return getNumJTEntries(JT, JTI) * 4 + 4;
}
default:

22
lib/Target/ARM/ARMInstrThumb.td
View File

@ -56,6 +56,10 @@ class TIt<dag ops, string asm, list<dag> pattern>
class TIx2<dag ops, string asm, list<dag> pattern>
: ThumbI<ops, AddrModeNone, Size4Bytes, asm, "", pattern>;
// BR_JT instructions
class TJTI<dag ops, string asm, list<dag> pattern>
: ThumbI<ops, AddrModeNone, SizeSpecial, asm, "", pattern>;
def imm_neg_XFORM : SDNodeXForm<imm, [{
return CurDAG->getTargetConstant(-(int)N->getValue(), MVT::i32);
}]>;
@ -188,9 +192,14 @@ let isCall = 1, noResults = 1,
[(ARMcall_nolink GPR:$dst)]>;
}
let isBranch = 1, isTerminator = 1, isBarrier = 1 in
let isBranch = 1, isTerminator = 1, isBarrier = 1 in {
def tB : TI<(ops brtarget:$dst), "b $dst", [(br bb:$dst)]>;
def tBR_JTr : TJTI<(ops GPR:$dst, jtblock_operand:$jt, i32imm:$id),
"cpy pc, $dst \n\t.align\t2\n$jt",
[(ARMbrjt GPR:$dst, tjumptable:$jt, imm:$id)]>;
}
let isBranch = 1, isTerminator = 1, noResults = 1, isBarrier = 1 in
def tBcc : TI<(ops brtarget:$dst, CCOp:$cc), "b$cc $dst",
[(ARMbrcond bb:$dst, imm:$cc)]>;
@ -477,6 +486,13 @@ def tLEApcrelCall : TI<(ops GPR:$dst, i32imm:$label),
"add $dst, pc, #PCRELV${:uid}")),
[]>;
def tLEApcrelJT : TI<(ops GPR:$dst, i32imm:$label, i32imm:$id),
!strconcat(!strconcat(".set PCRELV${:uid}, (${label}_${id:no_hash}-(",
"${:private}PCRELL${:uid}+4))\n"),
!strconcat("${:private}PCRELL${:uid}:\n\t",
"add $dst, pc, #PCRELV${:uid}")),
[]>;
//===----------------------------------------------------------------------===//
// Non-Instruction Patterns
//
@ -489,6 +505,10 @@ def : ThumbPat<(ARMWrapperCall tglobaladdr :$dst),
def : ThumbPat<(ARMWrapperCall texternalsym:$dst),
(tLEApcrelCall texternalsym:$dst)>;
// JumpTable
def : ThumbPat<(ARMWrapperJT tjumptable:$dst, imm:$id),
(tLEApcrelJT tjumptable:$dst, imm:$id)>;
// Direct calls
def : ThumbPat<(ARMtcall texternalsym:$func), (tBL texternalsym:$func)>;
def : ThumbV5Pat<(ARMcall texternalsym:$func), (tBLXi texternalsym:$func)>;