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Don't setCalleeSavedInfoValid() until spills are interted.

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In a naked function, the flag is never set and getPristineRegs() returns an
empty list. That means naked functions are able to clobber callee saved
registers, but that is the whole point of naked functions.

This fixes PR4716.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79096 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2009-08-15 13:10:46 +00:00
parent 4af85b2328
commit d62c9a697b
2 changed files with 12 additions and 2 deletions
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4
lib/CodeGen/PrologEpilogInserter.cpp
View File

@ -214,8 +214,6 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
}
}
FFI->setCalleeSavedInfoValid(true);
if (CSI.empty())
return; // Early exit if no callee saved registers are modified!
@ -274,6 +272,8 @@ void PEI::insertCSRSpillsAndRestores(MachineFunction &Fn) {
MachineFrameInfo *FFI = Fn.getFrameInfo();
const std::vector<CalleeSavedInfo> &CSI = FFI->getCalleeSavedInfo();
FFI->setCalleeSavedInfoValid(true);
// Early exit if no callee saved registers are modified!
if (CSI.empty())
return;

10
test/CodeGen/ARM/2009-08-15-RegScavengerAssert.ll Normal file
View File

@ -0,0 +1,10 @@
; RUN: llvm-as < %s | llc -march=arm
; PR4716
define arm_aapcscc void @_start() nounwind naked {
entry:
tail call arm_aapcscc void @exit(i32 undef) noreturn nounwind
unreachable
}
declare arm_aapcscc void @exit(i32) noreturn nounwind