[mips] Accept but ignore -m(no-)branch-likely

-mbranch-likely and -mno-branch-likely are used in some build systems for
some MIPS targets. Accept these options but ignore them as they are an
(de)optimiztion hint, and that branch likely instructions were deprecated
but not removed from MIPS32 and MIPS64 ISAs.

Reviewers: atanasyan, nitesh.jain

Differential Revision: https://reviews.llvm.org/D38168

llvm-svn: 314213

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 6406e26..32d5eac 100644 (file)
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -2047,6 +2047,10 @@ def mcheck_zero_division : Flag<["-"], "mcheck-zero-division">, Group<m_Group>;
 def mno_check_zero_division : Flag<["-"], "mno-check-zero-division">,
                               Group<m_Group>;
 def mcompact_branches_EQ : Joined<["-"], "mcompact-branches=">, Group<m_Group>;
+def mbranch_likely : Flag<["-"], "mbranch-likely">, Group<m_Group>,
+  IgnoredGCCCompat;
+def mno_branch_likely : Flag<["-"], "mno-branch-likely">, Group<m_Group>,
+  IgnoredGCCCompat;
 def mdsp : Flag<["-"], "mdsp">, Group<m_Group>;
 def mno_dsp : Flag<["-"], "mno-dsp">, Group<m_Group>;
 def mdspr2 : Flag<["-"], "mdspr2">, Group<m_Group>;

diff --git a/clang/test/Driver/mips-features.c b/clang/test/Driver/mips-features.c
index 5f6833e..a9db0f1 100644 (file)
--- a/clang/test/Driver/mips-features.c
+++ b/clang/test/Driver/mips-features.c
@@ -392,3 +392,13 @@
 // LONG-CALLS-ON: "-target-feature" "+long-calls"
 // LONG-CALLS-OFF: "-target-feature" "-long-calls"
 // LONG-CALLS-DEF-NOT: "long-calls"
+//
+// -mbranch-likely
+// RUN: %clang -target -mips-mti-linux-gnu -### -c %s -mbranch-likely 2>&1 \
+// RUN:   | FileCheck --check-prefix=BRANCH-LIKELY %s
+// BRANCH-LIKELY: argument unused during compilation: '-mbranch-likely'
+//
+// -mno-branch-likely
+// RUN: %clang -target -mips-mti-linux-gnu -### -c %s -mno-branch-likely 2>&1 \
+// RUN:   | FileCheck --check-prefix=NO-BRANCH-LIKELY %s
+// NO-BRANCH-LIKELY: argument unused during compilation: '-mno-branch-likely'