rs6000: Various fixes for the new fpscr builtins (PR87509)

With these fixes all testcases test clean for me, both on
powerpc64-linux {-m32,-m64} and on powerpc64le-linux, with all
relevant -mcpu= settings.


	PR target/87509
	* config/rs6000/rs6000-builtin.def (RS6000_BUILTIN_SET_FPSCR_DRN): Use
	RS6000_BTM_DFP.
	* config/rs6000/rs6000.md (rs6000_set_fpscr_rn): Require the operand
	to be DImode.  When using mffscrn, force the operand to a register.

gcc/testsuite/
	PR target/87509
	* gcc.target/powerpc/test_fpscr_drn_builtin.c: Use hard_dfp instead
	of dfp_hw.  Don't include <altivec.h>.
	* gcc.target/powerpc/test_fpscr_drn_builtin_error.c: Ditto.  Require
	lp64.
	* gcc.target/powerpc/test_fpscr_rn_builtin.c: Don't include <altivec.h>.
	* gcc.target/powerpc/test_fpscr_rn_builtin_error.c: Ditto.
	* gcc.target/powerpc/test_mffsl.c: Ditto.

From-SVN: r264863

gcc/ChangeLog

+2018-10-05  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/87509
+	* config/rs6000/rs6000-builtin.def (RS6000_BUILTIN_SET_FPSCR_DRN): Use
+	RS6000_BTM_DFP.
+	* config/rs6000/rs6000.md (rs6000_set_fpscr_rn): Require the operand
+	to be DImode.  When using mffscrn, force the operand to a register.
+
 2018-10-04  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.md (*fop_<X87MODEF:mode>_2_i387): Macroize insn

gcc/config/rs6000/rs6000-builtin.def

@@ -2510,7 +2510,7 @@ RS6000_BUILTIN_X (RS6000_BUILTIN_SET_FPSCR_RN, "__builtin_set_fpscr_rn",
 		  CODE_FOR_rs6000_set_fpscr_rn)
 
 RS6000_BUILTIN_X (RS6000_BUILTIN_SET_FPSCR_DRN, "__builtin_set_fpscr_drn",
-		  RS6000_BTM_ALWAYS,
+		  RS6000_BTM_DFP,
 		  RS6000_BTC_MISC | RS6000_BTM_64BIT | RS6000_BTC_UNARY
 		  | RS6000_BTC_VOID,
 		  CODE_FOR_rs6000_set_fpscr_drn)

gcc/config/rs6000/rs6000.md

@@ -5848,7 +5848,7 @@
   [(set_attr "type" "fp")])
 
 (define_expand "rs6000_set_fpscr_rn"
- [(match_operand 0 "reg_or_cint_operand")]
+ [(match_operand:DI 0 "reg_or_cint_operand")]
   "TARGET_HARD_FLOAT"
 {
   rtx tmp_df = gen_reg_rtx (DFmode);
@@ -5857,9 +5857,8 @@
      new rounding mode bits from operands[0][62:63] into FPSCR[62:63].  */
   if (TARGET_P9_MISC)
     {
-      rtx src_df = gen_reg_rtx (DImode);
-
-      src_df = simplify_gen_subreg (DFmode, operands[0], DImode, 0);
+      rtx src_df = force_reg (DImode, operands[0]);
+      src_df = simplify_gen_subreg (DFmode, src_df, DImode, 0);
       emit_insn (gen_rs6000_mffscrn (tmp_df, src_df));
       DONE;
     }

gcc/testsuite/ChangeLog

+2018-10-05  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/87509
+	* gcc.target/powerpc/test_fpscr_drn_builtin.c: Use hard_dfp instead
+	of dfp_hw.  Don't include <altivec.h>.
+	* gcc.target/powerpc/test_fpscr_drn_builtin_error.c: Ditto.  Require
+	lp64.
+	* gcc.target/powerpc/test_fpscr_rn_builtin.c: Don't include <altivec.h>.
+	* gcc.target/powerpc/test_fpscr_rn_builtin_error.c: Ditto.
+	* gcc.target/powerpc/test_mffsl.c: Ditto.
+
 2018-10-04  Vinay Kumar  <vinay.kumar@blackfigtech.com>
 
 	* c-c++-common/Wprio-ctor-dtor.c: New test.

gcc/testsuite/gcc.target/powerpc/test_fpscr_drn_builtin.c

 /* { dg-do run { target { powerpc*-*-* &&  lp64 } } } */
-/* { dg-require-effective-target dfp_hw } */
+/* { dg-require-effective-target hard_dfp } */
 /* { dg-options "-O2 -std=c99" } */
 
-#include <altivec.h>
-
 #ifdef DEBUG
 #include <stdio.h>
 #endif

gcc/testsuite/gcc.target/powerpc/test_fpscr_drn_builtin_error.c

-/* { dg-do compile { target powerpc*-*-* } } */
-/* { dg-require-effective-target dfp_hw } */
+/* { dg-do compile { target { powerpc*-*-* && lp64 } } } */
+/* { dg-require-effective-target hard_dfp } */
 /* { dg-options "-O2 -std=c99" } */
 
-#include <altivec.h>
-
 int main ()
 {
 

gcc/testsuite/gcc.target/powerpc/test_fpscr_rn_builtin.c

 /* { dg-do run { target { powerpc*-*-* } } } */
 /* { dg-options "-O2 -std=c99" } */
 
-#include <altivec.h>
-
 #ifdef DEBUG
 #include <stdio.h>
 #endif

gcc/testsuite/gcc.target/powerpc/test_fpscr_rn_builtin_error.c

 /* { dg-do compile { target powerpc*-*-* } } */
 /* { dg-options "-O2 -std=c99" } */
 
-#include <altivec.h>
-
 int main ()
 {
 

gcc/testsuite/gcc.target/powerpc/test_mffsl.c

 /* { dg-do run { target { powerpc*-*-* } } } */
 /* { dg-options "-O2 -std=c99" } */
 
-#include <altivec.h>
-
 #ifdef DEBUG
 #include <stdio.h>
 #endif