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[Sparc] Emit .register directive to declare the use of global registers %g2, %g4, %g6 and %g7. 

llvm-svn: 191158
This commit is contained in:
Venkatraman Govindaraju 2013-09-22 00:42:30 +00:00
parent a2c6e1e80f
commit e9ef51222b
2 changed files with 42 additions and 0 deletions
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26
llvm/lib/Target/Sparc/SparcAsmPrinter.cpp
View File

@ -20,6 +20,7 @@
#include "llvm/ADT/SmallString.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
@ -43,6 +44,7 @@ namespace {
const char *Modifier = 0);
void printCCOperand(const MachineInstr *MI, int opNum, raw_ostream &OS);
virtual void EmitFunctionBodyStart();
virtual void EmitInstruction(const MachineInstr *MI) {
SmallString<128> Str;
raw_svector_ostream OS(Str);
@ -63,11 +65,35 @@ namespace {
virtual bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB)
const;
void EmitGlobalRegisterDecl(unsigned reg) {
SmallString<128> Str;
raw_svector_ostream OS(Str);
OS << "\t.register "
<< "%" << StringRef(getRegisterName(reg)).lower()
<< ", "
<< ((reg == SP::G6 || reg == SP::G7)? "#ignore" : "#scratch");
OutStreamer.EmitRawText(OS.str());
}
};
} // end of anonymous namespace
#include "SparcGenAsmWriter.inc"
void SparcAsmPrinter::EmitFunctionBodyStart() {
if (!TM.getSubtarget<SparcSubtarget>().is64Bit())
return;
const MachineRegisterInfo &MRI = MF->getRegInfo();
const unsigned globalRegs[] = { SP::G2, SP::G3, SP::G6, SP::G7, 0 };
for (unsigned i = 0; globalRegs[i] != 0; ++i) {
unsigned reg = globalRegs[i];
if (!MRI.isPhysRegUsed(reg))
continue;
EmitGlobalRegisterDecl(reg);
}
}
void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand (opNum);

16
llvm/test/CodeGen/SPARC/64abi.ll
View File

@ -376,3 +376,19 @@ define signext i32 @ret_nosext(i32 signext %a0) {
define signext i32 @ret_nozext(i32 signext %a0) {
ret i32 %a0
}
; CHECK-LABEL: test_register_directive
; CHECK: .register %g2, #scratch
; CHECK: .register %g3, #scratch
; CHECK: .register %g6, #ignore
; CHECK: .register %g7, #ignore
; CHECK: add %i0, 2, %g2
; CHECK: add %i0, 3, %g3
define i32 @test_register_directive(i32 %i0) {
entry:
%0 = add nsw i32 %i0, 2
%1 = add nsw i32 %i0, 3
tail call void asm sideeffect "", "r,r,~{l0},~{l1},~{l2},~{l3},~{l4},~{l5},~{l6},~{l7},~{i0},~{i1},~{i2},~{i3},~{i4},~{i5},~{i6},~{i7},~{o0},~{o1},~{o2},~{o3},~{o4},~{o5},~{o6},~{o7},~{g1},~{g4},~{g5},~{g6},~{g7}"(i32 %0, i32 %1)
%2 = add nsw i32 %0, %1
ret i32 %2
}