Fix sparc %gsr write elimination and add a testcase.

gcc/

	* config/sparc/sparc.c (sparc_conditional_register_usage): When VIS
	is enabled, mark %gsr as global.
	* config/sparc/sparc.md (UNSPEC_WRGSR): Delete.
	(wrgsr_vis, *wrgsr_sp64, wrgsr_v8plus): Don't wrap in an unspec.

gcc/testsuite/

	* gcc.target/sparc/wrgsr.c: New test.

From-SVN: r179214

gcc/ChangeLog

 2011-09-26  David S. Miller  <davem@davemloft.net>
 
+	* config/sparc/sparc.c (sparc_conditional_register_usage): When VIS
+	is enabled, mark %gsr as global.
+	* config/sparc/sparc.md (UNSPEC_WRGSR): Delete.
+	(wrgsr_vis, *wrgsr_sp64, wrgsr_v8plus): Don't wrap in an unspec.
+
 	* config/sparc/sparc-c.c: New file implementing sparc_target_macros,
 	which will now define __VIS and __VIS__ when -mvis is enabled.
 	* config/sparc/t-sparc: Likewise.

gcc/config/sparc/sparc.c

@@ -10426,6 +10426,8 @@ sparc_conditional_register_usage (void)
       for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
 	leaf_reg_remap [regno] = regno;
     }
+  if (TARGET_VIS)
+    global_regs[SPARC_GSR_REG] = 1;
 }
 
 /* Implement TARGET_PREFERRED_RELOAD_CLASS

gcc/config/sparc/sparc.md

@@ -58,7 +58,7 @@
    (UNSPEC_MUL8UL		46)
    (UNSPEC_MULDUL		47)
    (UNSPEC_ALIGNDATA		48)
-   (UNSPEC_WRGSR                49)
+
    (UNSPEC_PDIST		50)
    (UNSPEC_EDGE8		51)
    (UNSPEC_EDGE8L		52)
@@ -7953,8 +7953,7 @@
    (set_attr "fptype" "double")])
 
 (define_expand "wrgsr_vis"
-  [(set (reg:DI GSR_REG) (unspec:DI [(match_operand:DI 0 "arith_operand" "")]
-                                    UNSPEC_WRGSR))]
+  [(set (reg:DI GSR_REG) (match_operand:DI 0 "arith_operand" ""))]
   "TARGET_VIS"
 {
   if (! TARGET_ARCH64)
@@ -7965,15 +7964,13 @@
 })
 
 (define_insn "*wrgsr_sp64"
-  [(set (reg:DI GSR_REG) (unspec:DI [(match_operand:DI 0 "arith_operand" "rI")]
-                                    UNSPEC_WRGSR))]
+  [(set (reg:DI GSR_REG) (match_operand:DI 0 "arith_operand" "rI"))]
   "TARGET_VIS && TARGET_ARCH64"
   "wr\t%%g0, %0, %%gsr"
   [(set_attr "type" "gsr")])
 
 (define_insn "wrgsr_v8plus"
-  [(set (reg:DI GSR_REG) (unspec:DI [(match_operand:DI 0 "arith_operand" "I,r")]
-                                    UNSPEC_WRGSR))
+  [(set (reg:DI GSR_REG) (match_operand:DI 0 "arith_operand" "I,r"))
    (clobber (match_scratch:SI 1 "=X,&h"))]
   "TARGET_VIS && ! TARGET_ARCH64"
 {

gcc/testsuite/ChangeLog

+2011-09-26  David S. Miller  <davem@davemloft.net>
+
+	* gcc.target/sparc/wrgsr.c: New test.
+
 2011-09-26  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/50515

gcc/testsuite/gcc.target/sparc/wrgsr.c

+/* { dg-do compile } */
+/* { dg-options "-O -mcpu=ultrasparc -mvis" } */
+
+void set_gsr (void)
+{
+	__builtin_vis_write_gsr (2 << 3);
+}
+
+void set_gsr2 (long x)
+{
+	__builtin_vis_write_gsr (x);
+}
+
+/* { dg-final { scan-assembler "wr\t%g0, 16, %gsr" } } */
+/* { dg-final { scan-assembler "wr\t%g0, %" } } */