xtensa: Refine constraint "T" to define_special_memory_constraint

References to literal pool entries do not need to be reloaded or converted
to "(mem (reg X))" to load via base register.

gcc/ChangeLog:

	* config/xtensa/constraints.md (T):
	Change define_memory_constraint to define_special_memory_constraint.

diff --git a/gcc/config/xtensa/constraints.md b/gcc/config/xtensa/constraints.md
index 77c95713085c5a1216bd7208b4560e36fe82864d..727ec1e2c2025cae69f7b4f5fa9ec4303c54b5bb 100644 (file)
--- a/gcc/config/xtensa/constraints.md
+++ b/gcc/config/xtensa/constraints.md
@@ -130,7 +130,7 @@
  (and (match_code "mem")
       (match_test "smalloffset_mem_p (op)")))
 
-(define_memory_constraint "T"
+(define_special_memory_constraint "T"
  "Memory in a literal pool (addressable with an L32R instruction)."
  (and (match_code "mem")
       (match_test "!TARGET_CONST16 && constantpool_mem_p (op)")))