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Fix a recent regression in Applications/sgefa that Alkis pointed out to me.

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The vector may actually be empty if the register that we are marking as
recently used is not actually allocatable.  This happens for physical registers
that are not allocatable, like the ST(x) registers on X86.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14195 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-06-16 06:57:29 +00:00
parent 59108d3d40
commit aebcce8404
1 changed files with 2 additions and 2 deletions
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4
lib/CodeGen/RegAllocLocal.cpp
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@ -93,8 +93,8 @@ namespace {
}
void MarkPhysRegRecentlyUsed(unsigned Reg) {
assert(!PhysRegsUseOrder.empty() && "No registers used!");
if (PhysRegsUseOrder.back() == Reg) return; // Already most recently used
if(PhysRegsUseOrder.empty() ||
PhysRegsUseOrder.back() == Reg) return; // Already most recently used
for (unsigned i = PhysRegsUseOrder.size(); i != 0; --i)
if (areRegsEqual(Reg, PhysRegsUseOrder[i-1])) {