re PR target/83618 (_rdpid_u32 doesn't work on 64-bit targets as gas expects the 64-bit register)

PR target/83618

gcc/
	* config/i386/i386.c (ix86_expand_builtin): Handle IX86_BUILTIN_RDPID.
	* config/i386/i386.md (rdpid_rex64) New.
	(rdpid): Make 32bit only.

gcc/testsuite/
	* gcc.target/i386/rdpid.c: Remove "eax".

From-SVN: r257229

gcc/ChangeLog

+2018-01-31  Julia Koval  <julia.koval@intel.com>
+
+	PR target/83618
+	* config/i386/i386.c (ix86_expand_builtin): Handle IX86_BUILTIN_RDPID.
+	* config/i386/i386.md (rdpid_rex64) New.
+	(rdpid): Make 32bit only.
+
 2018-01-29  Aldy Hernandez  <aldyh@redhat.com>
 
 	PR lto/84105

gcc/config/i386/i386.c

@@ -36736,6 +36736,29 @@ ix86_expand_builtin (tree exp, rtx target, rtx subtarget,
     case IX86_BUILTIN_NANSQ:
       return expand_call (exp, target, ignore);
 
+    case IX86_BUILTIN_RDPID:
+
+      op0 = gen_reg_rtx (TARGET_64BIT ? DImode : SImode);
+
+      if (TARGET_64BIT)
+	{
+	  insn = gen_rdpid_rex64 (op0);
+	  op0 = convert_to_mode (SImode, op0, 1);
+	}
+      else
+	insn = gen_rdpid (op0);
+      emit_insn (insn);
+
+      if (target == 0)
+	{
+	  /* mode is VOIDmode if __builtin_rdpid has been called
+	     without lhs.  */
+	  if (mode == VOIDmode)
+	    return target;
+	  target = gen_reg_rtx (mode);
+	}
+      emit_move_insn (target, op0);
+      return target;
     case IX86_BUILTIN_RDPMC:
     case IX86_BUILTIN_RDTSC:
     case IX86_BUILTIN_RDTSCP:

gcc/config/i386/i386.md

@@ -20559,7 +20559,14 @@
 (define_insn "rdpid"
   [(set (match_operand:SI 0 "register_operand" "=r")
 	(unspec_volatile:SI [(const_int 0)] UNSPECV_RDPID))]
-  "TARGET_RDPID"
+  "!TARGET_64BIT && TARGET_RDPID"
+  "rdpid\t%0"
+  [(set_attr "type" "other")])
+
+(define_insn "rdpid_rex64"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(unspec_volatile:DI [(const_int 0)] UNSPECV_RDPID))]
+  "TARGET_64BIT && TARGET_RDPID"
   "rdpid\t%0"
   [(set_attr "type" "other")])
 

gcc/testsuite/ChangeLog

+2018-01-31  Julia Koval  <julia.koval@intel.com>
+
+	PR target/83618
+	* gcc.target/i386/rdpid.c: Remove "eax".
+
 2018-01-31  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	PR tree-optimization/64946

gcc/testsuite/gcc.target/i386/rdpid.c

 /* { dg-do compile } */
 /* { dg-options "-O2 -mrdpid" } */
-/* { dg-final { scan-assembler "rdpid\[ \t]+(%|)eax" } } */
+/* { dg-final { scan-assembler "rdpid" } } */
 
 #include <x86intrin.h>