x86: permit "default" with .arch

So far there was no way to reset the architecture to that assembly would
start with in the absence of any overrides (command line or directives).
Note that for Intel MCU "default" is merely an alias of "iamcu".

While there also zap a stray @item from the doc section, as noticed
when inspecting the generated output (which still has some quirks, but
those aren't easy to address without re-flowing almost the entire
section).

5 files changed, 85 insertions, 8 deletions

diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index 4829ff8..a52ac8b 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -938,8 +938,8 @@ const relax_typeS md_relax_table[] =
 
 static const arch_entry cpu_arch[] =
 {
-  /* Do not replace the first two entries - i386_target_format()
-     relies on them being there in this order.  */
+  /* Do not replace the first two entries - i386_target_format() and
+     set_cpu_arch() rely on them being there in this order.  */
   ARCH (generic32, GENERIC32, GENERIC32, false),
   ARCH (generic64, GENERIC64, GENERIC64, false),
   ARCH (i8086, UNKNOWN, NONE, false),
@@ -2724,12 +2724,47 @@ set_cpu_arch (int dummy ATTRIBUTE_UNUSED)
 
   if (!is_end_of_line[(unsigned char) *input_line_pointer])
     {
-      char *string;
-      int e = get_symbol_name (&string);
-      unsigned int j;
+      char *s;
+      int e = get_symbol_name (&s);
+      const char *string = s;
+      unsigned int j = 0;
       i386_cpu_flags flags;
 
-      for (j = 0; j < ARRAY_SIZE (cpu_arch); j++)
+      if (strcmp (string, "default") == 0)
+	{
+	  if (strcmp (default_arch, "iamcu") == 0)
+	    string = default_arch;
+	  else
+	    {
+	      static const i386_cpu_flags cpu_unknown_flags = CPU_UNKNOWN_FLAGS;
+
+	      cpu_arch_name = NULL;
+	      free (cpu_sub_arch_name);
+	      cpu_sub_arch_name = NULL;
+	      cpu_arch_flags = cpu_unknown_flags;
+	      if (flag_code == CODE_64BIT)
+		{
+		  cpu_arch_flags.bitfield.cpu64 = 1;
+		  cpu_arch_flags.bitfield.cpuno64 = 0;
+		}
+	      else
+		{
+		  cpu_arch_flags.bitfield.cpu64 = 0;
+		  cpu_arch_flags.bitfield.cpuno64 = 1;
+		}
+	      cpu_arch_isa = PROCESSOR_UNKNOWN;
+	      cpu_arch_isa_flags = cpu_arch[flag_code == CODE_64BIT].flags;
+	      if (!cpu_arch_tune_set)
+		{
+		  cpu_arch_tune = cpu_arch_isa;
+		  cpu_arch_tune_flags = cpu_arch_isa_flags;
+		}
+
+	      j = ARRAY_SIZE (cpu_arch) + 1;
+	    }
+	}
+
+      for (; j < ARRAY_SIZE (cpu_arch); j++)
 	{
 	  if (strcmp (string, cpu_arch[j].name) == 0)
 	    {
@@ -2802,7 +2837,7 @@ set_cpu_arch (int dummy ATTRIBUTE_UNUSED)
 	  j = ARRAY_SIZE (cpu_arch);
 	}
 
-      if (j >= ARRAY_SIZE (cpu_arch))
+      if (j == ARRAY_SIZE (cpu_arch))
 	as_bad (_("no such architecture: `%s'"), string);
 
       *input_line_pointer = e;
@@ -13676,6 +13711,13 @@ show_arch (FILE *stream, int ext, int check)
 
   p = start;
   left = size - (start - message);
+
+  if (!ext && check)
+    {
+      p = output_message (stream, p, message, start, &left,
+			  STRING_COMMA_LEN ("default"));
+    }
+
   for (j = 0; j < ARRAY_SIZE (cpu_arch); j++)
     {
       /* Should it be skipped?  */
diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi
index 5262af2..95fd8ec 100644
--- a/gas/doc/c-i386.texi
+++ b/gas/doc/c-i386.texi
@@ -1504,6 +1504,7 @@ directive enables a warning when gas detects an instruction that is not
 supported on the CPU specified.  The choices for @var{cpu_type} are:
 
 @multitable @columnfractions .20 .20 .20 .20
+@item @samp{default}
 @item @samp{i8086} @tab @samp{i186} @tab @samp{i286} @tab @samp{i386}
 @item @samp{i486} @tab @samp{i586} @tab @samp{i686} @tab @samp{pentium}
 @item @samp{pentiumpro} @tab @samp{pentiumii} @tab @samp{pentiumiii} @tab @samp{pentium4}
@@ -1531,7 +1532,7 @@ supported on the CPU specified.  The choices for @var{cpu_type} are:
 @item @samp{.avx512_vpopcntdq} @tab @samp{.avx512_vbmi2} @tab @samp{.avx512_vnni}
 @item @samp{.avx512_bitalg} @tab @samp{.avx512_bf16} @tab @samp{.avx512_vp2intersect}
 @item @samp{.tdx} @tab @samp{.avx_vnni}  @tab @samp{.avx512_fp16}
-@item @samp{.clwb} @tab @samp{.rdpid} @tab @samp{.ptwrite} @tab @item @samp{.ibt}
+@item @samp{.clwb} @tab @samp{.rdpid} @tab @samp{.ptwrite} @tab @samp{.ibt}
 @item @samp{.wbnoinvd} @tab @samp{.pconfig} @tab @samp{.waitpkg} @tab @samp{.cldemote}
 @item @samp{.shstk} @tab @samp{.gfni} @tab @samp{.vaes} @tab @samp{.vpclmulqdq}
 @item @samp{.movdiri} @tab @samp{.movdir64b} @tab @samp{.enqcmd} @tab @samp{.tsxldtrk}
diff --git a/gas/testsuite/gas/i386/arch-dflt.l b/gas/testsuite/gas/i386/arch-dflt.l
new file mode 100644
index 0000000..d0953b1
--- /dev/null
+++ b/gas/testsuite/gas/i386/arch-dflt.l
@@ -0,0 +1,19 @@
+.*: Assembler messages:
+.*:3: Error:.*`cmovl'.*
+.*:9: Error:.*`cmovg'.*
+GAS LISTING .*
+
+
+[ 	]*[0-9]*[ 	]+\.text
+[ 	]*[0-9]*[ 	]+start:
+[ 	]*[0-9]*[ 	]+cmovl	%eax, %ecx
+[ 	]*[0-9]*[ 	]*
+[ 	]*[0-9]*[ 	]+\.arch default
+[ 	]*[0-9]*[ 	]+\?\?\?\? 0F4DC8[ 	]+cmovnl	%eax, %ecx
+[ 	]*[0-9]*[ 	]*
+[ 	]*[0-9]*[ 	]+\.arch generic32
+[ 	]*[0-9]*[ 	]+cmovg	%eax, %ecx
+[ 	]*[0-9]*[ 	]*
+[ 	]*[0-9]*[ 	]+\.arch default
+[ 	]*[0-9]*[ 	]+\?\?\?\? 0F4EC8[ 	]+cmovng	%eax, %ecx
+#pass
diff --git a/gas/testsuite/gas/i386/arch-dflt.s b/gas/testsuite/gas/i386/arch-dflt.s
new file mode 100644
index 0000000..718bf6f
--- /dev/null
+++ b/gas/testsuite/gas/i386/arch-dflt.s
@@ -0,0 +1,14 @@
+	.text
+start:
+	cmovl	%eax, %ecx
+
+	.arch default
+	cmovnl	%eax, %ecx
+
+	.arch generic32
+	cmovg	%eax, %ecx
+
+	.arch default
+	cmovng	%eax, %ecx
+
+	.end
diff --git a/gas/testsuite/gas/i386/i386.exp b/gas/testsuite/gas/i386/i386.exp
index ebb1b49..de4eb1c 100644
--- a/gas/testsuite/gas/i386/i386.exp
+++ b/gas/testsuite/gas/i386/i386.exp
@@ -205,6 +205,7 @@ if [gas_32_check] then {
     run_dump_test "arch-12"
     run_dump_test "arch-13"
     run_dump_test "arch-14"
+    run_list_test "arch-dflt" "-march=generic32 -al"
     run_dump_test "8087"
     run_dump_test "287"
     run_dump_test "387"