This llvm-gcc4 patch enabled predicate simplification pass. And now
loop unrolling is enabled only at -O2 or when -funroll-loops is used.
Index: llvm-backend.cpp
===================================================================
--- llvm-backend.cpp (revision 119002)
+++ llvm-backend.cpp (working copy)
@@ -234,6 +234,7 @@ void llvm_asm_file_start(void) {
PM->add(createCFGSimplificationPass()); // Merge & remove BBs
PM->add(createScalarReplAggregatesPass()); // Break up aggregate
allocas
PM->add(createInstructionCombiningPass()); // Combine silly seq's
+ PM->add(createPredicateSimplifierPass()); // Canonicalize
registers
PM->add(createCondPropagationPass()); // Propagate
conditionals
PM->add(createTailCallEliminationPass()); // Eliminate tail calls
PM->add(createCFGSimplificationPass()); // Merge & remove BBs
@@ -242,7 +243,8 @@ void llvm_asm_file_start(void) {
PM->add(createLoopUnswitchPass()); // Unswitch loops.
PM->add(createInstructionCombiningPass()); // Clean up after
LICM/reassoc
PM->add(createIndVarSimplifyPass()); // Canonicalize indvars
- PM->add(createLoopUnrollPass()); // Unroll small loops
+ if (flag_unroll_loops || optimize > 2)
+ PM->add(createLoopUnrollPass()); // Unroll small loops
PM->add(createInstructionCombiningPass()); // Clean up after the
unroller
if (optimize > 2)
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