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| author | Evan Cheng <evan.cheng@apple.com> | 2008-09-20 01:28:05 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-09-20 01:28:05 +0000 |
| commit | 5e8d9def77b4a68e6be32f21cda28d2a451267a9 (patch) | |
| tree | e4c5bff945b84a35c2bb29268428066b37410340 /lib/CodeGen | |
| parent | 4070e60efecb521e1badfbc0fd78840a62ce8450 (diff) | |
| download | llvm-5e8d9def77b4a68e6be32f21cda28d2a451267a9.tar.gz llvm-5e8d9def77b4a68e6be32f21cda28d2a451267a9.tar.bz2 llvm-5e8d9def77b4a68e6be32f21cda28d2a451267a9.tar.xz | |
Fix PR2808. When regalloc runs out of register, it spill a physical register around the live interval being allocated. Do not continue to try to spill another register, just grab the physical register and move on.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56381 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/RegAllocLinearScan.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp index 000dd41b97..df9d393a8f 100644 --- a/lib/CodeGen/RegAllocLinearScan.cpp +++ b/lib/CodeGen/RegAllocLinearScan.cpp @@ -855,9 +855,12 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur) // All registers must have inf weight. Just grab one! minReg = BestPhysReg ? BestPhysReg : *RC->allocation_order_begin(*mf_); if (cur->weight == HUGE_VALF || - li_->getApproximateInstructionCount(*cur) == 0) + li_->getApproximateInstructionCount(*cur) == 0) { // Spill a physical register around defs and uses. li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_); + assignRegOrStackSlotAtInterval(cur); + return; + } } // Find up to 3 registers to consider as spill candidates. |