x86: Issue error for return/argument only with function body

If we never generate function body, we shouldn't issue errors for return
nor argument.  Add silent_p to i386 machine_function to avoid issuing
errors for return and argument without function body.

gcc/

	PR target/99652
	* config/i386/i386-options.c (ix86_init_machine_status): Set
	silent_p to true.
	* config/i386/i386.c (init_cumulative_args): Set silent_p to
	false.
	(construct_container): Return early for return and argument
	errors if silent_p is true.
	* config/i386/i386.h (machine_function): Add silent_p.

gcc/testsuite/

	PR target/99652
	* gcc.dg/torture/pr99652-1.c: New test.
	* gcc.dg/torture/pr99652-2.c: Likewise.
	* gcc.target/i386/pr57655.c: Adjusted.
	* gcc.target/i386/pr59794-6.c: Likewise.
	* gcc.target/i386/pr70738-1.c: Likewise.
	* gcc.target/i386/pr96744-1.c: Likewise.

gcc/config/i386/i386-options.c

@@ -1768,6 +1768,7 @@ ix86_init_machine_status (void)
   f = ggc_cleared_alloc<machine_function> ();
   f->call_abi = ix86_abi;
   f->stack_frame_required = true;
+  f->silent_p = true;
 
   return f;
 }

gcc/config/i386/i386.c

@@ -1705,6 +1705,10 @@ init_cumulative_args (CUMULATIVE_ARGS *cum,  /* Argument info to initialize */
   struct cgraph_node *local_info_node = NULL;
   struct cgraph_node *target = NULL;
 
+  /* Set silent_p to false to raise an error for invalid calls when
+     expanding function body.  */
+  cfun->machine->silent_p = false;
+
   memset (cum, 0, sizeof (*cum));
 
   if (fndecl)
@@ -2534,6 +2538,10 @@ construct_container (machine_mode mode, machine_mode orig_mode,
      some less clueful developer tries to use floating-point anyway.  */
   if (needed_sseregs && !TARGET_SSE)
     {
+      /* Return early if we shouldn't raise an error for invalid
+	 calls.  */
+      if (cfun->machine->silent_p)
+	return NULL;
       if (in_return)
 	{
 	  if (!issued_sse_ret_error)
@@ -2558,6 +2566,10 @@ construct_container (machine_mode mode, machine_mode orig_mode,
 	  || regclass[i] == X86_64_X87UP_CLASS
 	  || regclass[i] == X86_64_COMPLEX_X87_CLASS)
 	{
+	  /* Return early if we shouldn't raise an error for invalid
+	     calls.  */
+	  if (cfun->machine->silent_p)
+	    return NULL;
 	  if (!issued_x87_ret_error)
 	    {
 	      error ("x87 register return with x87 disabled");

gcc/config/i386/i386.h

@@ -2945,6 +2945,10 @@ struct GTY(()) machine_function {
      function.  */
   BOOL_BITFIELD has_explicit_vzeroupper : 1;
 
+  /* True if we should act silently, rather than raise an error for
+     invalid calls.  */
+  BOOL_BITFIELD silent_p : 1;
+
   /* The largest alignment, in bytes, of stack slot actually used.  */
   unsigned int max_used_stack_alignment;
 

gcc/testsuite/gcc.dg/torture/pr99652-1.c

@@ -0,0 +1,8 @@
+/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-mgeneral-regs-only" } */
+
+inline double
+foo (void)
+{
+  return 1.0;
+}

gcc/testsuite/gcc.dg/torture/pr99652-2.c

@@ -0,0 +1,8 @@
+/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-mno-80387" } */
+
+inline double
+foo (void)
+{
+  return 1.0;
+}

gcc/testsuite/gcc.target/i386/pr57655.c

@@ -2,7 +2,7 @@
 /* { dg-options "-mavx -mvzeroupper -mno-fp-ret-in-387" } */
 
 long double
-foo (long double x)
-{ /* { dg-error "x87 register return with x87 disabled" "" { target { ! ia32 } } } */
+foo (long double x) /* { dg-error "x87 register return with x87 disabled" "" { target { ! ia32 } } } */
+{
   return __builtin_ilogbl (x);
 }

gcc/testsuite/gcc.target/i386/pr59794-6.c

@@ -8,7 +8,7 @@ typedef int __v4si __attribute__ ((__vector_size__ (16)));
 extern __v4si x;
 
 __v4si
-foo (void)
-{ /* { dg-error "SSE register return with SSE disabled" } */
+foo (void) /* { dg-error "SSE register return with SSE disabled" } */
+{
   return x;
 }

gcc/testsuite/gcc.target/i386/pr70738-1.c

@@ -3,7 +3,7 @@
 
 typedef int int32x2_t __attribute__ ((__vector_size__ ((8))));
 
-int32x2_t test (int32x2_t a, int32x2_t b)
-{ /* { dg-error "SSE register return with SSE disabled" } */
+int32x2_t test (int32x2_t a, int32x2_t b) /* { dg-error "SSE register return with SSE disabled" } */
+{
   return a + b;
 }

gcc/testsuite/gcc.target/i386/pr96744-1.c

@@ -4,7 +4,7 @@
 typedef int int32x2_t __attribute__ ((__vector_size__ ((8))));
 
 __attribute__((__target__("general-regs-only")))
-int32x2_t test (int32x2_t a, int32x2_t b)
-{ /* { dg-error "SSE register return with SSE disabled" } */
+int32x2_t test (int32x2_t a, int32x2_t b) /* { dg-error "SSE register return with SSE disabled" } */
+{
   return a + b;
 }