Add fast register allocator, enabled with -regalloc=fast.

So far this is just a clone of -regalloc=local that has been lobotomized to run
25% faster. It drops the least-recently-used calculations, and is just plain
stupid when it runs out of registers.

The plan is to make this go even faster for -O0 by taking advantage of the short
live intervals in unoptimized code. It should not be necessary to calculate
liveness when most virtual registers are killed 2-3 instructions after they are
born.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102006 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/LinkAllCodegenComponents.h b/include/llvm/CodeGen/LinkAllCodegenComponents.h
index 27947e8afe..0064776ca2 100644
--- a/include/llvm/CodeGen/LinkAllCodegenComponents.h
+++ b/include/llvm/CodeGen/LinkAllCodegenComponents.h
@@ -34,6 +34,7 @@ namespace {
       (void) llvm::createDeadMachineInstructionElimPass();
 
       (void) llvm::createLocalRegisterAllocator();
+      (void) llvm::createFastRegisterAllocator();
       (void) llvm::createLinearScanRegisterAllocator();
       (void) llvm::createPBQPRegisterAllocator();