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Fix issue in regscavenger when scavenging a callee-saved register that has not been spilled. 

llvm-svn: 77912
This commit is contained in:
Jakob Stoklund Olesen 2009-08-02 20:29:41 +00:00
parent 4bf58b8add
commit 185eb035e9
2 changed files with 11 additions and 4 deletions
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9
llvm/lib/CodeGen/RegisterScavenging.cpp
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@ -471,9 +471,16 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
Reg = Candidates.find_next(Reg);
}
assert(ScavengedReg == 0 &&
assert(ScavengedReg == 0 &&
"Scavenger slot is live, unable to scavenge another register!");
// Make sure SReg is marked as used. It could be considered available if it is
// one of the callee saved registers, but hasn't been spilled.
if (!isUsed(SReg)) {
MBB->addLiveIn(SReg);
setUsed(SReg);
}
// Spill the scavenged register before I.
TII->storeRegToStackSlot(*MBB, I, SReg, true, ScavengingFrameIndex, RC);
MachineBasicBlock::iterator II = prior(I);

6
llvm/test/CodeGen/Blackfin/addsub-i128.ll
View File

@ -1,7 +1,7 @@
; RUN: llvm-as < %s | llc -march=bfin -verify-machineinstrs
; XFAIL: *
; Assertion failed: (isUsed(Reg) && "Using an undefined register!"),
; function forward, file RegisterScavenging.cpp, line 182.
; These functions have just the right size to annoy the register scavenger: They
; use all the scratch registers, but not all the callee-saved registers.
define void @test_add(i64 %AL, i64 %AH, i64 %BL, i64 %BH, i64* %RL, i64* %RH) {
entry: