invoke.texi (SPARC options): Document -mlra as the default.

	* doc/invoke.texi (SPARC options): Document -mlra as the default.
	* config/sparc/sparc.c (sparc_option_override): Force LRA unless
	-mlra/-mno-lra was passed to the compiler.

From-SVN: r244034

gcc/ChangeLog

+2017-01-03  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* doc/invoke.texi (SPARC options): Document -mlra as the default.
+	* config/sparc/sparc.c (sparc_option_override): Force LRA unless
+	-mlra/-mno-lra was passed to the compiler.
+
 2017-01-03  James Cowgill  <James.Cowgill@imgtec.com>
 
 	PR rtl-optimization/65618

gcc/config/sparc/sparc.c

@@ -1523,6 +1523,10 @@ sparc_option_override (void)
   if (TARGET_ARCH32)
     target_flags &= ~MASK_STACK_BIAS;
 
+  /* Use LRA instead of reload, unless otherwise instructed.  */
+  if (!(target_flags_explicit & MASK_LRA))
+    target_flags |= MASK_LRA;
+
   /* Supply a default value for align_functions.  */
   if (align_functions == 0
       && (sparc_cpu == PROCESSOR_ULTRASPARC

gcc/doc/invoke.texi

@@ -23271,8 +23271,8 @@ in 64-bit mode.
 @itemx -mno-lra
 @opindex mlra
 @opindex mno-lra
-Enable Local Register Allocation.  This is experimental for SPARC, so by
-default the compiler uses standard reload (i.e. @option{-mno-lra}).
+Enable Local Register Allocation.  This is the default for SPARC since GCC 7
+so @option{-mno-lra} needs to be passed to get old Reload.
 
 @item -mcpu=@var{cpu_type}
 @opindex mcpu