On 2011-04-15 01:41, Alexander Best wrote:
per coincidence i discovered the following contrary behavior between gcc and
clang:
-mno-mmx implies -mno-3dnow under gcc. under clang -mno-mmx will *not* imply
-mno-3dnow!
is this a clang design feature or a bug? fixing it would be trivial (see
attached patch).
I don't think it was intentionally designed, nor that it is a bug. It
it just arbitrary what you disable when you specify '-mno-mmx'.
However, it would probably be nice if clang emulated gcc's behaviour
here.
Adding cfe-commits@ in the loop, to see if the clang guys think this is
desirable.
diff --git a/contrib/llvm/tools/clang/lib/Basic/Targets.cpp
b/contrib/llvm/tools/clang/lib/Basic/Targets.cpp
index 55321f2..1af7c52 100644
--- a/contrib/llvm/tools/clang/lib/Basic/Targets.cpp
+++ b/contrib/llvm/tools/clang/lib/Basic/Targets.cpp
@@ -1133,8 +1133,9 @@ bool X86TargetInfo::setFeatureEnabled(llvm::StringMap<bool>
&Features,
Features["avx"] = true;
} else {
if (Name == "mmx")
- Features["mmx"] = Features["sse"] = Features["sse2"] = Features["sse3"] =
- Features["ssse3"] = Features["sse41"] = Features["sse42"] = false;
+ Features["mmx"] = Features["3dnow"] = Features["3dnowa"] =
+ Features["sse"] = Features["sse2"] = Features["sse3"] =
+ Features["ssse3"] = Features["sse41"] = Features["sse42"] = false;
else if (Name == "sse")
Features["sse"] = Features["sse2"] = Features["sse3"] =
Features["ssse3"] = Features["sse41"] = Features["sse42"] = false;
_______________________________________________
freebsd-toolchain@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-toolchain
To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
