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ARM addrmode4 instructions (ldm, stm and friends) can't encode an immediate

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offset for stack references. Make sure we take that into account when
deciding whether to reserver an emergency spill slot for the register
scavenger. rdar://8559625

llvm-svn: 116714
This commit is contained in:
Jim Grosbach 2010-10-18 16:48:59 +00:00
parent f93e92a4c1
commit 3e41568604
1 changed files with 2 additions and 1 deletions
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3
lib/Target/ARM/ARMBaseRegisterInfo.cpp
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@ -661,8 +661,9 @@ ARMBaseRegisterInfo::estimateRSStackSizeLimit(MachineFunction &MF) const {
if (hasFP(MF) && AFI->hasStackFrame()) if (hasFP(MF) && AFI->hasStackFrame())
Limit = std::min(Limit, (1U << 8) - 1); Limit = std::min(Limit, (1U << 8) - 1);
break; break;
case ARMII::AddrMode4:
case ARMII::AddrMode6: case ARMII::AddrMode6:
// Addressing mode 6 (load/store) instructions can't encode an // Addressing modes 4 & 6 (load/store) instructions can't encode an
// immediate offset for stack references. // immediate offset for stack references.
return 0; return 0;
default: default: