[Bug optimization/15016] New: '-mcpu=ultrasparc3' doesn't create US-III code

[gcc-bugzilla at gcc dot gnu dot org]

	The new "ultrasparc3" compiler flag doesn't actually build 'us3' code.
        Rather, it just builds generic SPARCV8PLUS or SPARCV9.                  

        As seen above, this was built with the Sun assembler, /usr/ccs/bin/as,  
        rather than the GNU assembler.                                          

        When building code with the flag '-mcpu=ultrasparc', gcc 3.3.3 sends    
        a flag to the assembler, '-xarch=v8plusa' or '-xarch=v9a', that tells   
        the assmebler to build code requiring the UltraSPARC extensions.        

        Similarly, the relatively new '-mcpu=ultrasparc3' flag SHOULD send      
        the '-xarch=v8plusb' or '-xarch=v9b' flag.  It doesn't.  Instead,       
        it sends the '-xarch=v8plus' or '-xarch=v9' flag.                       

        This results in generic SPARCV9 code, rather than UltraSPARC III code.

Environment:
System: SunOS jplis-jmp-001 5.10 s10_54 sun4u sparc SUNW,Sun-Fire-V240
Architecture: sun4

	
host: sparc-sun-solaris2.10
build: sparc-sun-solaris2.10
target: sparc-sun-solaris2.10
configured with: /usr/local/build/gnu/gcc-3.3.3/configure --with-ld=/usr/ccs/bin/ld --with-as=/usr/ccs/bin/as --disable-shared --disable-nls --enable-threads=posix --with-system-zlib

How-To-Repeat:
	E.g.:

	# Ultrasparc:
	% gcc -v -m64 -mcpu=ultrasparc -o hw hw.c |& grep /usr/ccs/bin/as

	/usr/ccs/bin/as -V -Qy -s -xarch=v9a -o /tmp/cc0tc2ad.o /tmp/cc7UNxCC.s

	# Ultrasparc III:
	% gcc -v -m64 -mcpu=ultrasparc3 -o hw hw.c |& grep /usr/ccs/bin/as

	/usr/ccs/bin/as -V -Qy -s -xarch=v9 -o /tmp/ccgc16C7.o /tmp/ccH9daQ4.s
                                  ^^^^^^^^^

	That SHOULD be '-xarch=v9b'.
------- Additional Comments From root at jplis-jmp-001 dot jpl dot nasa dot gov  2004-04-20 00:07 -------
Fix:
	The diffs below add US-III definitions like the standard UltraSPARC
	definitions.  If you really don't want to rebuild the compiler, it's
	also possible (but probably not advised) to edit:

	 /usr/local/lib/gcc-lib/sparc-sun-solaris2.x/3.3.3/specs

	and add the proper entries for US-III.

	gcc/config/sparc/sol2-bi.h:

--- sparc/sol2-bi.h     Thu Dec 18 12:12:49 2003
+++ sparc/sol2-bi.h.new Mon Apr 19 15:50:56 2004
@@ -26,6 +26,14 @@
 #undef ASM_CPU64_DEFAULT_SPEC
 #define ASM_CPU64_DEFAULT_SPEC AS_SPARC64_FLAG "a"
 #endif
+#if TARGET_CPU_DEFAULT == TARGET_CPU_ultrasparc3
+#undef CPP_CPU64_DEFAULT_SPEC
+#define CPP_CPU64_DEFAULT_SPEC ""
+#undef ASM_CPU32_DEFAULT_SPEC
+#define ASM_CPU32_DEFAULT_SPEC "-xarch=v8plusb"
+#undef ASM_CPU64_DEFAULT_SPEC
+#define ASM_CPU64_DEFAULT_SPEC AS_SPARC64_FLAG "b"
+#endif
 
 #if DEFAULT_ARCH32_P
 #define DEF_ARCH32_SPEC(__str) "%{!m64:" __str "}"
@@ -51,6 +59,7 @@
 
 #undef ASM_CPU_SPEC
 #define ASM_CPU_SPEC "\
+%{mcpu=ultrasparc3:" DEF_ARCH32_SPEC("-xarch=v8plusb") DEF_ARCH64_SPEC(AS_SPARC64_FLAG "b") "} \
 %{mcpu=ultrasparc:" DEF_ARCH32_SPEC("-xarch=v8plusa") DEF_ARCH64_SPEC(AS_SPARC64_FLAG "a") "} \
 %{mcpu=v9:" DEF_ARCH32_SPEC("-xarch=v8plus") DEF_ARCH64_SPEC(AS_SPARC64_FLAG) "} \
 %{!mcpu=ultrasparc:%{!mcpu=v9:%{mcpu*:" DEF_ARCH32_SPEC("-xarch=v8") DEF_ARCH64_SPEC(AS_SPARC64_FLAG) "}}} \	

	gcc/config/sparc/sol2.h:

--- sparc/sol2.h        Sun Sep 15 05:03:42 2002
+++ sparc/sol2.h.new    Mon Apr 19 15:51:44 2004
@@ -39,11 +39,17 @@
 #define ASM_CPU_DEFAULT_SPEC "-xarch=v8plusa"
 #endif
 
+#if TARGET_CPU_DEFAULT == TARGET_CPU_ultrasparc3
+#undef ASM_CPU_DEFAULT_SPEC
+#define ASM_CPU_DEFAULT_SPEC "-xarch=v8plusb"
+#endif
+
 #undef ASM_CPU_SPEC
 #define ASM_CPU_SPEC "\
 %{mcpu=v8plus:-xarch=v8plus} \
 %{mcpu=v9:-xarch=v8plus} \
 %{mcpu=ultrasparc:-xarch=v8plusa} \
+%{mcpu=ultrasparc3:-xarch=v8plusb} \
 %{!mcpu*:%(asm_cpu_default)} \
 "

-- 
           Summary: '-mcpu=ultrasparc3' doesn't create US-III code
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: root at jplis-jmp-001 dot jpl dot nasa dot gov
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: sparc-sun-solaris2.10
  GCC host triplet: sparc-sun-solaris2.10
GCC target triplet: sparc-sun-solaris2.10


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15016