A couple of FP-related fixes (prompted by Adam having trouble

running SPEC FP codes).

arch/alpha/isa_desc:
    Don't warn about non-standard trapping modes more than
    once per static instruction.  (Had the flag to suppress
    these but forgot to check it!)
build/SConstruct:
    Add USE_SSE2 option to enable compiling w/SSE2 (important
    for getting IEEE-compliant FP on x86).

--HG--
extra : convert_revision : eac69efb28cce7b48035480d8b7cb004782969f4

arch/alpha/isa_desc

@@ -712,7 +712,7 @@ def template FloatingPointExecute {{
     Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
 				  Trace::InstRecord *traceData) const
     {
-	if (trappingMode != Imprecise) {
+	if (trappingMode != Imprecise && !warnedOnTrapping) {
 	    warn("%s: non-standard trapping mode not supported",
 		 generateDisassembly(0, NULL));
 	    warnedOnTrapping = true;
@@ -755,7 +755,7 @@ def template FPFixedRoundingExecute {{
     Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
 				  Trace::InstRecord *traceData) const
     {
-	if (trappingMode != Imprecise) {
+	if (trappingMode != Imprecise && !warnedOnTrapping) {
 	    warn("%s: non-standard trapping mode not supported",
 		 generateDisassembly(0, NULL));
 	    warnedOnTrapping = true;

build/SConstruct

@@ -233,6 +233,9 @@ sticky_opts.AddOptions(
     BoolOption('SS_COMPATIBLE_FP',
                'Make floating-point results compatible with SimpleScalar',
                False),
+    BoolOption('USE_SSE2',
+               'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
+               False),
     BoolOption('STATS_BINNING', 'Bin statistics by CPU mode', have_mysql),
     BoolOption('USE_MYSQL', 'Use MySQL for stats output', have_mysql),
     BoolOption('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
@@ -376,6 +379,9 @@ for build_dir in build_dirs:
         env['CC']  = env['BATCH_CMD'] + ' ' + env['CC']
         env['CXX'] = env['BATCH_CMD'] + ' ' + env['CXX']
 
+    if env['USE_SSE2']:
+        env.Append(CCFLAGS='-msse2')
+
     # The m5/SConscript file sets up the build rules in 'env' according
     # to the configured options.  It returns a list of environments,
     # one for each variant build (debug, opt, etc.)