From 5e8d9def77b4a68e6be32f21cda28d2a451267a9 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Sat, 20 Sep 2008 01:28:05 +0000 Subject: 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 --- lib/CodeGen/RegAllocLinearScan.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'lib/CodeGen/RegAllocLinearScan.cpp') 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. -- cgit v1.2.3-70-g09d2