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ARM: fix bug in -Oz stack adjustment folding

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Previously, we clobbered callee-saved registers when folding an "add
sp, #N" into a "pop {rD, ...}" instruction. This change checks whether
a register we're going to add to the "pop" could actually be live
outside the function before doing so and should fix the issue.

This should fix PR18081.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196046 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover
2013-12-01 14:16:24 +00:00
parent e1139818e8
commit e54f6dca50
5 changed files with 28 additions and 23 deletions
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7
lib/Target/ARM/Thumb1FrameLowering.cpp
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@@ -215,13 +215,6 @@ void Thumb1FrameLowering::emitPrologue(MachineFunction &MF) const {
AFI->setShouldRestoreSPFromFP(true);
}
static bool isCalleeSavedRegister(unsigned Reg, const uint16_t *CSRegs) {
for (unsigned i = 0; CSRegs[i]; ++i)
if (Reg == CSRegs[i])
return true;
return false;
}
static bool isCSRestore(MachineInstr *MI, const uint16_t *CSRegs) {
if (MI->getOpcode() == ARM::tLDRspi &&
MI->getOperand(1).isFI() &&