x86: Don't enable UINTR in 32-bit mode

UINTR is available only in 64-bit mode.  Since the codegen target is
unknown when the the gcc driver is processing -march=native, to properly
handle UINTR for -march=native:

1. Pass "arch [32|64]" and "tune [32|64]" to host_detect_local_cpu to
indicate 32-bit and 64-bit codegen.
2. Change ix86_option_override_internal to enable UINTR only in 64-bit
mode for -march=CPU when PTA_CPU includes PTA_UINTR.

gcc/

	PR target/101395
	* config/i386/driver-i386.c (host_detect_local_cpu): Check
	"arch [32|64]" and "tune [32|64]" for 32-bit and 64-bit codegen.
	Enable UINTR only for 64-bit codegen.
	* config/i386/i386-options.c
	(ix86_option_override_internal::DEF_PTA): Skip PTA_UINTR if not
	in 64-bit mode.
	* config/i386/i386.h (ARCH_ARG): New.
	(CC1_CPU_SPEC): Pass "[arch|tune] 32" for 32-bit codegen and
	"[arch|tune] 64" for 64-bit codegen.

gcc/testsuite/

	PR target/101395
	* gcc.target/i386/pr101395-1.c: New test.
	* gcc.target/i386/pr101395-2.c: Likewise.
	* gcc.target/i386/pr101395-3.c: Likewise.

3 files changed, 24 insertions, 9 deletions

diff --git a/gcc/config/i386/driver-i386.c b/gcc/config/i386/driver-i386.c
index dd92366..f844a16 100644
--- a/gcc/config/i386/driver-i386.c
+++ b/gcc/config/i386/driver-i386.c
@@ -370,9 +370,9 @@ detect_caches_intel (bool xeon_mp, unsigned max_level,
 }
 
 /* This will be called by the spec parser in gcc.c when it sees
-   a %:local_cpu_detect(args) construct.  Currently it will be called
-   with either "arch" or "tune" as argument depending on if -march=native
-   or -mtune=native is to be substituted.
+   a %:local_cpu_detect(args) construct.  Currently it will be
+   called with either "arch [32|64]" or "tune [32|64]" as argument
+   depending on if -march=native or -mtune=native is to be substituted.
 
    It returns a string containing new command line parameters to be
    put at the place of the above two options, depending on what CPU
@@ -401,7 +401,7 @@ const char *host_detect_local_cpu (int argc, const char **argv)
 
   unsigned int l2sizekb = 0;
 
-  if (argc < 1)
+  if (argc < 2)
     return NULL;
 
   arch = !strcmp (argv[0], "arch");
@@ -409,6 +409,15 @@ const char *host_detect_local_cpu (int argc, const char **argv)
   if (!arch && strcmp (argv[0], "tune"))
     return NULL;
 
+  bool codegen_x86_64;
+
+  if (!strcmp (argv[1], "32"))
+    codegen_x86_64 = false;
+  else if (!strcmp (argv[1], "64"))
+    codegen_x86_64 = true;
+  else
+    return NULL;
+
   struct __processor_model cpu_model = { };
   struct __processor_model2 cpu_model2 = { };
   unsigned int cpu_features2[SIZE_OF_CPU_FEATURES] = { };
@@ -804,8 +813,12 @@ const char *host_detect_local_cpu (int argc, const char **argv)
 	if (isa_names_table[i].option)
 	  {
 	    if (has_feature (isa_names_table[i].feature))
-	      options = concat (options, " ",
-				isa_names_table[i].option, NULL);
+	      {
+		if (codegen_x86_64
+		    || isa_names_table[i].feature != FEATURE_UINTR)
+		  options = concat (options, " ",
+				    isa_names_table[i].option, NULL);
+	      }
 	    else
 	      options = concat (options, neg_option,
 				isa_names_table[i].option + 2, NULL);
diff --git a/gcc/config/i386/i386-options.c b/gcc/config/i386/i386-options.c
index 7a35c46..7cba655 100644
--- a/gcc/config/i386/i386-options.c
+++ b/gcc/config/i386/i386-options.c
@@ -2109,6 +2109,7 @@ ix86_option_override_internal (bool main_args_p,
 #define DEF_PTA(NAME) \
 	if (((processor_alias_table[i].flags & PTA_ ## NAME) != 0) \
 	    && PTA_ ## NAME != PTA_64BIT \
+	    && (TARGET_64BIT || PTA_ ## NAME != PTA_UINTR) \
 	    && !TARGET_EXPLICIT_ ## NAME ## _P (opts)) \
 	  SET_TARGET_ ## NAME (opts);
 #include "i386-isa.def"
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 8c3eace..324e8a9 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -576,10 +576,11 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
 #ifndef HAVE_LOCAL_CPU_DETECT
 #define CC1_CPU_SPEC CC1_CPU_SPEC_1
 #else
+#define ARCH_ARG "%{" OPT_ARCH64 ":64;:32}"
 #define CC1_CPU_SPEC CC1_CPU_SPEC_1 \
-"%{march=native:%>march=native %:local_cpu_detect(arch) \
-  %{!mtune=*:%>mtune=native %:local_cpu_detect(tune)}} \
-%{mtune=native:%>mtune=native %:local_cpu_detect(tune)}"
+"%{march=native:%>march=native %:local_cpu_detect(arch " ARCH_ARG ") \
+  %{!mtune=*:%>mtune=native %:local_cpu_detect(tune " ARCH_ARG ")}} \
+%{mtune=native:%>mtune=native %:local_cpu_detect(tune " ARCH_ARG ")}"
 #endif
 #endif