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Pull in r226664 from upstream llvm trunk (by Tim Northover):

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AArch64: add backend option to reserve x18 (platform register)

  AAPCS64 says that it's up to the platform to specify whether x18 is
  reserved, and a first step on that way is to add a flag controlling
  it.

  From: Andrew Turner <andrew@fubar.geek.nz>

Requested by:	andrew
This commit is contained in:
Dimitry Andric 2015-01-26 21:17:14 +00:00
parent bd2830bcb3
commit 5ada58c747
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=277774
1 changed files with 7 additions and 3 deletions
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10
contrib/llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
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@ -33,6 +33,10 @@ using namespace llvm;
#define GET_REGINFO_TARGET_DESC
#include "AArch64GenRegisterInfo.inc"
static cl::opt<bool>
ReserveX18("aarch64-reserve-x18", cl::Hidden,
cl::desc("Reserve X18, making it unavailable as GPR"));
AArch64RegisterInfo::AArch64RegisterInfo(const AArch64InstrInfo *tii,
const AArch64Subtarget *sti)
: AArch64GenRegisterInfo(AArch64::LR), TII(tii), STI(sti) {}
@ -90,7 +94,7 @@ AArch64RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
Reserved.set(AArch64::W29);
}
if (STI->isTargetDarwin()) {
if (STI->isTargetDarwin() || ReserveX18) {
Reserved.set(AArch64::X18); // Platform register
Reserved.set(AArch64::W18);
}
@ -117,7 +121,7 @@ bool AArch64RegisterInfo::isReservedReg(const MachineFunction &MF,
return true;
case AArch64::X18:
case AArch64::W18:
return STI->isTargetDarwin();
return STI->isTargetDarwin() || ReserveX18;
case AArch64::FP:
case AArch64::W29:
return TFI->hasFP(MF) || STI->isTargetDarwin();
@ -379,7 +383,7 @@ unsigned AArch64RegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC,
case AArch64::GPR64commonRegClassID:
return 32 - 1 // XZR/SP
- (TFI->hasFP(MF) || STI->isTargetDarwin()) // FP
- STI->isTargetDarwin() // X18 reserved as platform register
- (STI->isTargetDarwin() || ReserveX18) // X18 reserved as platform register
- hasBasePointer(MF); // X19
case AArch64::FPR8RegClassID:
case AArch64::FPR16RegClassID: