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comment why we use custom epilogue for t1 functions using vaargs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98182 91177308-0d34-0410-b5e6-96231b3b80d8
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Jim Grosbach 2010-03-10 19:59:47 +00:00
parent 2cd9ffef6e
commit 004453e85e
1 changed files with 5 additions and 0 deletions
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5
lib/Target/ARM/Thumb1RegisterInfo.cpp
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@ -854,6 +854,11 @@ void Thumb1RegisterInfo::emitEpilogue(MachineFunction &MF,
} }
if (VARegSaveSize) { if (VARegSaveSize) {
// Unlike T2 and ARM mode, the T1 pop instruction cannot restore
// to LR, and we can't pop the value directly to the PC since
// we need to update the SP after popping the value. Therefore, we
// pop the old LR into R3 as a temporary.
// Move back past the callee-saved register restoration // Move back past the callee-saved register restoration
while (MBBI != MBB.end() && isCSRestore(MBBI, CSRegs)) while (MBBI != MBB.end() && isCSRestore(MBBI, CSRegs))
++MBBI; ++MBBI;