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Make sure that for C++ emitting LwConstant32 pseudos, that it corresponds

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to what is needed for constant islands. The prescan method for Mips16 constant
islands will eventually go away. It is only temporary and should be done
earlier when the instructions are first created or from the DAG. If we keep
it here we need to handle better the situation where constant islands
is called multiple times since don't want to prescan more than once.

llvm-svn: 195569
This commit is contained in:
Reed Kotler 2013-11-24 06:18:50 +00:00
parent 7f1c6f3d84
commit 6088c0e228
3 changed files with 6 additions and 4 deletions
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4
lib/Target/Mips/Mips16InstrInfo.cpp
View File

@ -281,7 +281,7 @@ void Mips16InstrInfo::adjustStackPtrBig(unsigned SP, int64_t Amount,
//
//
MachineInstrBuilder MIB1 = BuildMI(MBB, I, DL, get(Mips::LwConstant32), Reg1);
MIB1.addImm(Amount);
MIB1.addImm(Amount).addImm(-1);
MachineInstrBuilder MIB2 = BuildMI(MBB, I, DL, get(Mips::MoveR3216), Reg2);
MIB2.addReg(Mips::SP, RegState::Kill);
MachineInstrBuilder MIB3 = BuildMI(MBB, I, DL, get(Mips::AdduRxRyRz16), Reg1);
@ -393,7 +393,7 @@ Mips16InstrInfo::loadImmediate(unsigned FrameReg,
}
else
Available.reset(Reg);
BuildMI(MBB, II, DL, get(Mips::LwConstant32), Reg).addImm(Imm);
BuildMI(MBB, II, DL, get(Mips::LwConstant32), Reg).addImm(Imm).addImm(-1);
NewImm = 0;
if (FrameReg == Mips::SP) {
SpReg = Available.find_first();

2
lib/Target/Mips/MipsConstantIslandPass.cpp
View File

@ -1518,13 +1518,13 @@ MipsConstantIslands::fixupConditionalBr(ImmBranch &Br) {
void MipsConstantIslands::prescanForConstants() {
unsigned J = 0;
(void)J;
PrescannedForConstants = true;
for (MachineFunction::iterator B =
MF->begin(), E = MF->end(); B != E; ++B) {
for (MachineBasicBlock::instr_iterator I =
B->instr_begin(), EB = B->instr_end(); I != EB; ++I) {
switch(I->getDesc().getOpcode()) {
case Mips::LwConstant32: {
PrescannedForConstants = true;
DEBUG(dbgs() << "constant island constant " << *I << "\n");
J = I->getNumOperands();
DEBUG(dbgs() << "num operands " << J << "\n");

4
test/CodeGen/Mips/largefr1.ll
View File

@ -1,5 +1,6 @@
; RUN: llc -march=mipsel -mcpu=mips16 -relocation-model=static < %s | FileCheck %s -check-prefix=1
; RUN: llc -mtriple=mipsel-linux-gnu -march=mipsel -mcpu=mips16 -relocation-model=static < %s | FileCheck %s -check-prefix=1
; RUN: llc -mtriple=mipsel-linux-gnu -march=mipsel -mcpu=mips16 -soft-float -mips16-hard-float -relocation-model=pic -mips16-constant-islands < %s | FileCheck %s -check-prefix=ci
@i = common global i32 0, align 4
@j = common global i32 0, align 4
@ -71,4 +72,5 @@ entry:
ret i32 0
}
; ci: lw ${{[0-9]+}}, $CPI{{[0-9]+}}_{{[0-9]+}}
declare i32 @printf(i8*, ...)