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[5/7,ARC] Use ACCL, ACCH registers whenever they are available.

Message ID 1492172084-3921-6-git-send-email-claziss@synopsys.com
State New
Headers show

Commit Message

Claudiu Zissulescu April 14, 2017, 12:14 p.m. UTC 
gcc/
2016-12-09  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_conditional_register_usage): Use ACCL,
	ACCH registers whenever they are available.
---
 gcc/config/arc/arc.c | 9 +++++++++
 1 file changed, 9 insertions(+)
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Patch

diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c
index f820622..73d72c68 100644
--- a/gcc/config/arc/arc.c
+++ b/gcc/config/arc/arc.c
@@ -1588,6 +1588,15 @@  arc_conditional_register_usage (void)
     SET_HARD_REG_BIT (reg_class_contents[WRITABLE_CORE_REGS], ACCH_REGNO);
     SET_HARD_REG_BIT (reg_class_contents[CHEAP_CORE_REGS], ACCL_REGNO);
     SET_HARD_REG_BIT (reg_class_contents[CHEAP_CORE_REGS], ACCH_REGNO);
+    SET_HARD_REG_BIT (reg_class_contents[GENERAL_REGS], ACCL_REGNO);
+    SET_HARD_REG_BIT (reg_class_contents[GENERAL_REGS], ACCH_REGNO);
+    SET_HARD_REG_BIT (reg_class_contents[MPY_WRITABLE_CORE_REGS], ACCL_REGNO);
+    SET_HARD_REG_BIT (reg_class_contents[MPY_WRITABLE_CORE_REGS], ACCH_REGNO);
+
+     /* Allow the compiler to freely use them.  */
+    fixed_regs[ACCL_REGNO] = 0;
+    fixed_regs[ACCH_REGNO] = 0;
+
     arc_hard_regno_mode_ok[ACC_REG_FIRST] = D_MODES;
   }
 }