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Cleaning up of prologue/epilogue code for Mips16. First step

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here is to make save/restore into variable number of argument instructions.

llvm-svn: 196726
This commit is contained in:
Reed Kotler 2013-12-08 16:51:52 +00:00
parent 2ef97554d8
commit cba0ad1234
8 changed files with 59 additions and 39 deletions
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24
lib/Target/Mips/InstPrinter/MipsInstPrinter.cpp
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@ -83,6 +83,19 @@ void MipsInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
case Mips::RDHWR64:
O << "\t.set\tpush\n";
O << "\t.set\tmips32r2\n";
break;
case Mips::Save16:
case Mips::SaveX16:
O << "\tsave\t";
printSaveRestore(MI, O);
O << "\n";
return;
case Mips::Restore16:
case Mips::RestoreX16:
O << "\trestore\t";
printSaveRestore(MI, O);
O << "\n";
return;
}
// Try to print any aliases first.
@ -286,3 +299,14 @@ bool MipsInstPrinter::printAlias(const MCInst &MI, raw_ostream &OS) {
default: return false;
}
}
void MipsInstPrinter::printSaveRestore(const MCInst *MI, raw_ostream &O) {
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
if (i != 0) O << ", ";
if (MI->getOperand(i).isReg())
printRegName(O, MI->getOperand(i).getReg());
else
printUnsignedImm(MI, i, O);
}
}

1
lib/Target/Mips/InstPrinter/MipsInstPrinter.h
View File

@ -104,6 +104,7 @@ private:
bool printAlias(const char *Str, const MCInst &MI, unsigned OpNo0,
unsigned OpNo1, raw_ostream &OS);
bool printAlias(const MCInst &MI, raw_ostream &OS);
void printSaveRestore(const MCInst *MI, raw_ostream &O);
};
} // end namespace llvm

17
lib/Target/Mips/Mips16InstrInfo.cpp
View File

@ -182,12 +182,17 @@ void Mips16InstrInfo::makeFrame(unsigned SP, int64_t FrameSize,
DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
if (!NeverUseSaveRestore) {
if (isUInt<11>(FrameSize))
BuildMI(MBB, I, DL, get(Mips::SaveRaF16)).addImm(FrameSize);
//BuildMI(MBB, I, DL, get(Mips::SaveRaF16)).addImm(FrameSize);
BuildMI(MBB, I, DL, get(Mips::SaveX16)).addReg(Mips::RA).
addReg(Mips::S0).
addReg(Mips::S1).addReg(Mips::S2).addImm(FrameSize);
else {
int Base = 2040; // should create template function like isUInt that
// returns largest possible n bit unsigned integer
int64_t Remainder = FrameSize - Base;
BuildMI(MBB, I, DL, get(Mips::SaveRaF16)). addImm(Base);
BuildMI(MBB, I, DL, get(Mips::SaveX16)).addReg(Mips::RA).
addReg(Mips::S0).
addReg(Mips::S1).addReg(Mips::S2).addImm(Base);
if (isInt<16>(-Remainder))
BuildAddiuSpImm(MBB, I, -Remainder);
else
@ -224,7 +229,9 @@ void Mips16InstrInfo::restoreFrame(unsigned SP, int64_t FrameSize,
DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
if (!NeverUseSaveRestore) {
if (isUInt<11>(FrameSize))
BuildMI(MBB, I, DL, get(Mips::RestoreRaF16)).addImm(FrameSize);
BuildMI(MBB, I, DL, get(Mips::RestoreX16)).addReg(Mips::RA).
addReg(Mips::S0).
addReg(Mips::S1).addReg(Mips::S2).addImm(FrameSize);
else {
int Base = 2040; // should create template function like isUInt that
// returns largest possible n bit unsigned integer
@ -233,7 +240,9 @@ void Mips16InstrInfo::restoreFrame(unsigned SP, int64_t FrameSize,
BuildAddiuSpImm(MBB, I, Remainder);
else
adjustStackPtrBig(SP, Remainder, MBB, I, Mips::A0, Mips::A1);
BuildMI(MBB, I, DL, get(Mips::RestoreRaF16)). addImm(Base);
BuildMI(MBB, I, DL, get(Mips::RestoreX16)).addReg(Mips::RA).
addReg(Mips::S0).
addReg(Mips::S1).addReg(Mips::S2).addImm(Base);
}
}
else {

44
lib/Target/Mips/Mips16InstrInfo.td
View File

@ -957,26 +957,18 @@ def OrRxRxRy16: FRxRxRy16_ins<0b01101, "or", IIAlu>, ArithLogic16Defs<1>;
// stack
//
// fixed form for restoring RA and the frame
// for direct object emitter, encoding needs to be adjusted for the
// frame size
//
let ra=1, s=0,s0=1,s1=1 in
def RestoreRaF16:
FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size),
"restore\t$$ra, $$s0, $$s1, $$s2, $frame_size", [], IILoad >, MayLoad {
def Restore16:
FI8_SVRS16<0b1, (outs), (ins variable_ops),
"", [], IILoad >, MayLoad {
let isCodeGenOnly = 1;
let Defs = [S0, S1, S2, RA, SP];
let Defs = [SP];
let Uses = [SP];
}
// Use Restore to increment SP since SP is not a Mip 16 register, this
// is an easy way to do that which does not require a register.
//
let ra=0, s=0,s0=0,s1=0 in
def RestoreIncSpF16:
FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size),
"restore\t$frame_size", [], IILoad >, MayLoad {
def RestoreX16:
FI8_SVRS16<0b1, (outs), (ins variable_ops),
"", [], IILoad >, MayLoad {
let isCodeGenOnly = 1;
let Defs = [SP];
let Uses = [SP];
@ -989,23 +981,17 @@ def RestoreIncSpF16:
// To set up a stack frame on entry to a subroutine,
// saving return address and static registers, and adjusting stack
//
let ra=1, s=1,s0=1,s1=1 in
def SaveRaF16:
FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size),
"save\t$$ra, $$s0, $$s1, $$s2, $frame_size", [], IIStore >, MayStore {
def Save16:
FI8_SVRS16<0b1, (outs), (ins variable_ops),
"", [], IIStore >, MayStore {
let isCodeGenOnly = 1;
let Uses = [RA, SP, S0, S1, S2];
let Uses = [SP];
let Defs = [SP];
}
//
// Use Save to decrement the SP by a constant since SP is not
// a Mips16 register.
//
let ra=0, s=0,s0=0,s1=0 in
def SaveDecSpF16:
FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size),
"save\t$frame_size", [], IIStore >, MayStore {
def SaveX16:
FI8_SVRS16<0b1, (outs), (ins variable_ops),
"", [], IIStore >, MayStore {
let isCodeGenOnly = 1;
let Uses = [SP];
let Defs = [SP];

4
test/CodeGen/Mips/align16.ll
View File

@ -25,7 +25,7 @@ entry:
call void @p(i32* %arrayidx1)
ret void
}
; 16: save $ra, $s0, $s1, $s2, 2040
; 16: save $ra, $16, $17, $18, 2040
; 16: addiu $sp, -56 # 16 bit inst
; 16: addiu $sp, 56 # 16 bit inst
; 16: restore $ra, $s0, $s1, $s2, 2040
; 16: restore $ra, $16, $17, $18, 2040

2
test/CodeGen/Mips/alloca16.ll
View File

@ -20,7 +20,7 @@ entry:
define void @test() nounwind {
entry:
; 16: .frame $sp,24,$ra
; 16: save $ra, $s0, $s1, $s2, 24
; 16: save $ra, $16, $17, $18, 24
; 16: move $16, $sp
; 16: move ${{[0-9]+}}, $sp
; 16: subu $[[REGISTER:[0-9]+]], ${{[0-9]+}}, ${{[0-9]+}}

2
test/CodeGen/Mips/ex2.ll
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@ -6,7 +6,7 @@
define i32 @main() {
; 16-LABEL: main:
; 16: .cfi_startproc
; 16: save $ra, $s0, $s1, $s2, 40
; 16: save $ra, $16, $17, $18, 40
; 16: .cfi_def_cfa_offset 40
; 16: .cfi_offset 18, -8
; 16: .cfi_offset 17, -12

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

@ -25,7 +25,7 @@ entry:
; SR32: .set noreorder
; SR32: .set nomacro
; SR32: .set noat
; SR: save $ra, $s0, $s1, $s2, [[FS:[0-9]+]]
; SR: save $ra, $16, $17, $18, [[FS:[0-9]+]]
; PE: .ent main
; PE: .align 2
; PE-NEXT: li $[[T1:[0-9]+]], %hi(_gp_disp)
@ -37,7 +37,7 @@ entry:
; C2: move $25, ${{[0-9]+}}
; C1: move $gp, ${{[0-9]+}}
; C1: jalrc ${{[0-9]+}}
; SR: restore $ra, $s0, $s1, $s2, [[FS]]
; SR: restore $ra, $16, $17, $18, [[FS]]
; PE: li $2, 0
; PE: jrc $ra