sparc.h (TARGET_BUGGY_QP_LIB): Define to zero.

2002-05-07  David S. Miller  <davem@redhat.com>

	* config/sparc/sparc.h (TARGET_BUGGY_QP_LIB): Define to zero.
	* config/sparc/sol2.h (TARGET_BUGGY_QP_LIB): Override to one.
	* config/sparc/sparc.c (emit_soft_tfmode_libcall): If the Qp
	library implementation clobbers the output before the inputs
	are fully consumed, use stack temporary for the output.

From-SVN: r53322

gcc/ChangeLog

+2002-05-07  David S. Miller  <davem@redhat.com>
+
+	* config/sparc/sparc.h (TARGET_BUGGY_QP_LIB): Define to zero.
+	* config/sparc/sol2.h (TARGET_BUGGY_QP_LIB): Override to one.
+	* config/sparc/sparc.c (emit_soft_tfmode_libcall): If the Qp
+	library implementation clobbers the output before the inputs
+	are fully consumed, use stack temporary for the output.
+
 2002-05-09  Jason Thorpe  <thorpej@wasabisystems.com>
 
 	* config/netbsd.h (CPP_SPEC): Remove.

gcc/config/sparc/sol2.h

@@ -225,6 +225,12 @@ Boston, MA 02111-1307, USA.  */
 #define MODDI3_LIBCALL "__rem64"
 #define UMODDI3_LIBCALL "__urem64"
 
+/* Solaris's _Qp_* library routine implementation clobbers the output
+   memory before the inputs are fully consumed.  */
+
+#undef TARGET_BUGGY_QP_LIB
+#define TARGET_BUGGY_QP_LIB	1
+
 #undef INIT_SUBTARGET_OPTABS
 #define INIT_SUBTARGET_OPTABS						\
   fixsfdi_libfunc							\

gcc/config/sparc/sparc.c

@@ -2476,7 +2476,7 @@ emit_soft_tfmode_libcall (func_name, nargs, operands)
      rtx *operands;
 {
   rtx ret_slot = NULL, arg[3], func_sym;
-  int i, j;
+  int i;
 
   /* We only expect to be called for conversions, unary, and binary ops.  */
   if (nargs < 2 || nargs > 3)
@@ -2490,27 +2490,17 @@ emit_soft_tfmode_libcall (func_name, nargs, operands)
       /* TFmode arguments and return values are passed by reference.  */
       if (GET_MODE (this_arg) == TFmode)
 	{
-	  if (GET_CODE (this_arg) == MEM)
-	    {
-	      this_arg = XEXP (this_arg, 0);
+	  int force_stack_temp;
 
-	      /* Make sure the output is not in the same place
-		 as one of our inputs.  */
-	      if (i == 0)
-		{
-		  for (j = 1; j < nargs; j++)
-		    if (rtx_equal_p (operands[0], operands[j]))
-		      break;
+	  force_stack_temp = 0;
+	  if (TARGET_BUGGY_QP_LIB && i == 0)
+	    force_stack_temp = 1;
 
-		  if (j != nargs)
-		    {
-		      ret_slot = assign_stack_temp (TFmode,
-						    GET_MODE_SIZE (TFmode), 0);
-		      this_arg = XEXP (ret_slot, 0);
-		    }
-		}
-	    }
-	  else if (CONSTANT_P (this_arg))
+	  if (GET_CODE (this_arg) == MEM
+	      && ! force_stack_temp)
+	    this_arg = XEXP (this_arg, 0);
+	  else if (CONSTANT_P (this_arg)
+		   && ! force_stack_temp)
 	    {
 	      this_slot = force_const_mem (TFmode, this_arg);
 	      this_arg = XEXP (this_slot, 0);

gcc/config/sparc/sparc.h

@@ -2598,6 +2598,11 @@ do {                                                                    \
 #define LTTF2_LIBCALL "_Q_flt"
 #define LETF2_LIBCALL "_Q_fle"
 
+/* Assume by default that the _Qp_* 64-bit libcalls are implemented such
+   that the inputs are fully consumed before the output memory is clobbered.  */
+
+#define TARGET_BUGGY_QP_LIB	0
+
 /* We can define the TFmode sqrt optab only if TARGET_FPU.  This is because
    with soft-float, the SFmode and DFmode sqrt instructions will be absent,
    and the compiler will notice and try to use the TFmode sqrt instruction