[Bug bootstrap/49104] bootstrap failure on AMD K6-2 with illegal instruction (cmove) in stage2

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49104

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.05.22 18:04:30
   Target Milestone|---                         |4.6.1
     Ever Confirmed|0                           |1

--- Comment #4 from Uros Bizjak <ubizjak at gmail dot com> 2011-05-22 18:04:30 UTC ---
No, the problem is in search_line_mmx (lex.c), compiled with SSE option.  This
option also enables CMOVE instruction, so we have protect usage of
search_line_mmx with following patch:

--cut here--
Index: libcpp/lex.c
===================================================================
--- libcpp/lex.c    (revision 174030)
+++ libcpp/lex.c    (working copy)
@@ -480,7 +480,7 @@
 static void __attribute__((constructor))
 init_vectorized_lexer (void)
 {
-  unsigned dummy, ecx = 0, edx = 0;
+  unsigned dummy, ecx = 0, edx = 0, edx_e = 0;
   search_line_fast_type impl = search_line_acc_char;
   int minimum = 0;

@@ -488,7 +488,7 @@
   minimum = 3;
 #elif defined(__SSE2__)
   minimum = 2;
-#elif defined(__SSE__) || defined(__3dNOW_A__)
+#elif defined(__SSE__)
   minimum = 1;
 #endif

@@ -503,9 +503,9 @@
       else if (minimum == 1 || (edx & bit_SSE))
     impl = search_line_mmx;
     }
-  else if (__get_cpuid (0x80000001, &dummy, &dummy, &dummy, &edx))
+  else if (__get_cpuid (0x80000001, &dummy, &dummy, &dummy, &edx_e))
     {
-      if (minimum == 1 || edx & bit_3DNOWP)
+      if (minimum == 1 || (edx_e & bit_3DNOWP && edx & bit_CMOV))
     impl = search_line_mmx;
     }

--cut here--

Reinhard, can you please test the above patch?