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Add simple frame index elimination

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75939 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2009-07-16 13:49:25 +00:00
parent 81c0325cdf
commit 51f613fb2b
5 changed files with 70 additions and 2 deletions
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40
lib/Target/SystemZ/SystemZRegisterInfo.cpp
View File

@ -17,6 +17,7 @@
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/BitVector.h"
@ -77,9 +78,46 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
assert(0 && "Not implemented yet!");
}
int SystemZRegisterInfo::getFrameIndexOffset(MachineFunction &MF, int FI) const {
const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
MachineFrameInfo *MFI = MF.getFrameInfo();
int Offset = MFI->getObjectOffset(FI) + MFI->getOffsetAdjustment();
uint64_t StackSize = MFI->getStackSize();
Offset += StackSize - TFI.getOffsetOfLocalArea();
// Skip the register save area if we generated the stack frame.
if (StackSize)
Offset -= TFI.getOffsetOfLocalArea();
return Offset;
}
void SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
int SPAdj, RegScavenger *RS) const {
assert(0 && "Not implemented yet!");
assert(SPAdj == 0 && "Unxpected");
unsigned i = 0;
MachineInstr &MI = *II;
MachineFunction &MF = *MI.getParent()->getParent();
while (!MI.getOperand(i).isFI()) {
++i;
assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
}
int FrameIndex = MI.getOperand(i).getIndex();
unsigned BasePtr = (hasFP(MF) ? SystemZ::R11D : SystemZ::R15D);
// This must be part of a rri or ri operand memory reference. Replace the
// FrameIndex with base register with BasePtr. Add an offset to the
// displacement field.
MI.getOperand(i).ChangeToRegister(BasePtr, false);
// Offset is a 20-bit integer.
// FIXME: handle "too long" displacements.
int Offset = getFrameIndexOffset(MF, FrameIndex) + MI.getOperand(i+1).getImm();
MI.getOperand(i+1).ChangeToImmediate(Offset);
}
void SystemZRegisterInfo::emitPrologue(MachineFunction &MF) const {

2
lib/Target/SystemZ/SystemZRegisterInfo.h
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@ -39,6 +39,8 @@ struct SystemZRegisterInfo : public SystemZGenRegisterInfo {
bool hasFP(const MachineFunction &MF) const;
int getFrameIndexOffset(MachineFunction &MF, int FI) const;
void eliminateCallFramePseudoInstr(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const;

2
lib/Target/SystemZ/SystemZTargetMachine.cpp
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@ -41,7 +41,7 @@ SystemZTargetMachine::SystemZTargetMachine(const Module &M, const std::string &F
: Subtarget(*this, M, FS),
DataLayout("E-p:64:64:64-i1:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128"),
InstrInfo(*this), TLInfo(*this),
FrameInfo(TargetFrameInfo::StackGrowsDown, 8, 0) {
FrameInfo(TargetFrameInfo::StackGrowsDown, 8, -160) {
}
bool SystemZTargetMachine::addInstSelector(PassManagerBase &PM,

16
test/CodeGen/SystemZ/06-FrameIdxLoad.ll Normal file
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@ -0,0 +1,16 @@
; RUN: llvm-as < %s | llc | grep 160 | count 1
; RUN: llvm-as < %s | llc | grep 168 | count 1
target datalayout = "E-p:64:64:64-i1:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128"
target triple = "s390x-unknown-linux-gnu"
define i64 @foo(i64 %a, i64 %b, i64 %c, i64 %d, i64 %e, i64 %f, i64* %g) nounwind readnone {
entry:
ret i64 %f
}
define i64 @bar(i64 %a, i64 %b, i64 %c, i64 %d, i64 %e, i64 %f, i64* %g) nounwind readnone {
entry:
%conv = ptrtoint i64* %g to i64 ; <i64> [#uses=1]
ret i64 %conv
}

12
test/CodeGen/SystemZ/06-LocalFrame.ll Normal file
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@ -0,0 +1,12 @@
; RUN: llvm-as < %s | llc | grep 160 | count 1
; RUN: llvm-as < %s | llc | grep 328 | count 1
target datalayout = "E-p:64:64:64-i1:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128"
target triple = "s390x-unknown-linux-gnu"
define noalias i64* @foo(i64 %a, i64 %b, i64 %c, i64 %d, i64 %e, i64 %f) nounwind readnone {
entry:
%g = alloca i64, align 8 ; <i64*> [#uses=1]
%add.ptr = getelementptr i64* %g, i64 %f ; <i64*> [#uses=1]
ret i64* %add.ptr
}