Now, loop unrolling is enable at -O2 only if it is not explicitly set/
reset using -f[no-]unroll-loops.
-
Devang
Index: opts.c
===================================================================
--- opts.c (revision 118611)
+++ opts.c (working copy)
@@ -548,6 +548,11 @@ void set_flags_from_O (unsigned int cmdl
/* PRE tends to generate bigger code. */
flag_tree_pre = 1;
}
+ /* APPLE LOCAL begin LLVM */
+ /* Enable loop unrolling at -O2 if -f[no-]unroll-loops is not
used. */
+ if (!flag_unroll_loops_set)
+ flag_unroll_loops = 1;
+ /* APPLE LOCAL end LLVM */
}
if (optimize >= 3)
Index: llvm-backend.cpp
===================================================================
--- llvm-backend.cpp (revision 119003)
+++ llvm-backend.cpp (working copy)
@@ -243,7 +243,7 @@ void llvm_asm_file_start(void) {
PM->add(createLoopUnswitchPass()); // Unswitch loops.
PM->add(createInstructionCombiningPass()); // Clean up after
LICM/reassoc
PM->add(createIndVarSimplifyPass()); // Canonicalize indvars
- if (flag_unroll_loops || optimize > 1)
+ if (flag_unroll_loops)
PM->add(createLoopUnrollPass()); // Unroll small loops
PM->add(createInstructionCombiningPass()); // Clean up after the
unroller
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