[driver] Add a -Ofast option, which enables -O3, -ffast-math, and
-fstrict-aliasing.
rdar://13622687
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179216 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index ed207e6..3281e36 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -68,6 +68,9 @@
if (A->getOption().matches(options::OPT_O0))
return 0;
+ if (A->getOption().matches(options::OPT_Ofast))
+ return 3;
+
assert (A->getOption().matches(options::OPT_O));
StringRef S(A->getValue());
@@ -97,6 +100,13 @@
return 0;
}
+static bool isOptimizationLevelFast(ArgList &Args) {
+ if (Arg *A = Args.getLastArg(options::OPT_O_Group))
+ if (A->getOption().matches(options::OPT_Ofast))
+ return true;
+ return false;
+}
+
static void addWarningArgs(ArgList &Args, std::vector<std::string> &Warnings) {
for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
E = Args.filtered_end(); I != E; ++I) {
@@ -324,7 +334,8 @@
Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
OPT_fuse_register_sized_bitfield_access);
- Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
+ Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing) ||
+ isOptimizationLevelFast(Args);
Opts.StructPathTBAA = Args.hasArg(OPT_struct_path_tbaa);
Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
@@ -1302,7 +1313,8 @@
// inlining enabled.
Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
- Opts.FastMath = Args.hasArg(OPT_ffast_math);
+ Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
+ isOptimizationLevelFast(Args);
Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
Opts.RetainCommentsFromSystemHeaders =