Add altivec version of block comment skipping code.

llvm-svn: 39093

clang/Lex/Lexer.cpp

@@ -772,6 +772,9 @@ static bool isEndOfBlockCommentWithEscapedNewLine(const char *CurPtr,
 
 #ifdef __SSE2__
 #include <emmintrin.h>
+#elif __ALTIVEC__
+#include <altivec.h>
+#undef bool
 #endif
 
 /// SkipBlockComment - We have just read the /* characters from input.  Read
@@ -808,7 +811,15 @@ bool Lexer::SkipBlockComment(LexerToken &Result, const char *CurPtr) {
       while (CurPtr+16 <= BufferEnd &&
              _mm_movemask_epi8(_mm_cmpeq_epi8(*(__m128i*)CurPtr, Slashes)) == 0)
         CurPtr += 16;
-#else             
+#elif __ALTIVEC__
+      __vector unsigned char Slashes = {
+        '/', '/', '/', '/',  '/', '/', '/', '/', 
+        '/', '/', '/', '/',  '/', '/', '/', '/'
+      };
+      while (CurPtr+16 <= BufferEnd &&
+             !vec_any_eq(*(vector unsigned char*)CurPtr, Slashes))
+        CurPtr += 16;
+#else    
       // Scan for '/' quickly.  Many block comments are very large.
       while (CurPtr[0] != '/' &&
              CurPtr[1] != '/' &&

clang/Lex/Makefile

@@ -12,10 +12,16 @@
 ##===----------------------------------------------------------------------===##
 
 LEVEL = ../../..
+include $(LEVEL)/Makefile.config
+
 LIBRARYNAME := clangLex
 BUILD_ARCHIVE = 1
 CXXFLAGS = -fno-rtti 
 
+ifeq ($(ARCH),PowerPC)
+CXXFLAGS += -maltivec
+endif
+
 CPPFLAGS += -I$(PROJ_SRC_DIR)/../include
 
 include $(LEVEL)/Makefile.common