[NDS32] New option -minline-asm-r15.

gcc/
	* config/nds32/nds32.c
	(nds32_md_asm_adjust): Consider flag_inline_asm_r15 variable.
	* config/nds32/nds32.opt (minline-asm-r15): New option.

From-SVN: r260400

gcc/ChangeLog

 2018-05-19  Chung-Ju Wu  <jasonwucj@gmail.com>
 
+	* config/nds32/nds32.c
+	(nds32_md_asm_adjust): Consider flag_inline_asm_r15 variable.
+	* config/nds32/nds32.opt (minline-asm-r15): New option.
+
+2018-05-19  Chung-Ju Wu  <jasonwucj@gmail.com>
+
 	* common/config/nds32/nds32-common.c (TARGET_DEFAULT_TARGET_FLAGS): Add
 	MASK_HW_ABS.
 	* config/nds32/nds32.md (abssi2): New pattern.

gcc/config/nds32/nds32.c

@@ -4066,8 +4066,11 @@ nds32_md_asm_adjust (vec<rtx> &outputs ATTRIBUTE_UNUSED,
 		     vec<const char *> &constraints ATTRIBUTE_UNUSED,
 		     vec<rtx> &clobbers, HARD_REG_SET &clobbered_regs)
 {
-  clobbers.safe_push (gen_rtx_REG (SImode, TA_REGNUM));
-  SET_HARD_REG_BIT (clobbered_regs, TA_REGNUM);
+  if (!flag_inline_asm_r15)
+    {
+      clobbers.safe_push (gen_rtx_REG (SImode, TA_REGNUM));
+      SET_HARD_REG_BIT (clobbered_regs, TA_REGNUM);
+    }
   return NULL;
 }
 

gcc/config/nds32/nds32.opt

@@ -446,3 +446,7 @@ Always save $lp in the stack.
 munaligned-access
 Target Report Var(flag_unaligned_access) Init(0)
 Enable unaligned word and halfword accesses to packed data.
+
+minline-asm-r15
+Target Report Var(flag_inline_asm_r15) Init(0)
+Allow use r15 for inline ASM.