[committed] Fix minor bug in epiphany port

So I consider this port dead as it semi-randomly fails in reload due to
unrelated changes earlier in the gimple and RTL pipelines.  Regardless Richard
S's late-combine work did show a very obvious error in the port that we should
go ahead and fix as long as the port is in-tree.

The epiphany add-with-immediate instruction allows an 11 bit signed immediate.
That gives the instruction an immediate range of -1024..1023.

The port actually allowed -8192..8191 due to the uber-weird constraint
definition.  I've simplified the constraint to match the hardware documentation
I was able to find.  That was enough to get the epiphany port to build
libgcc/newlib with Richard S's late-combine work.

The testsuite is so flakey on that port (due to the reload failures) that my
tester doesn't run it.  So no comparisons are available.

gcc/
	* config/epiphany/constraints.md (Car): Allow -1024..1023, no more,
	no less.

1 files changed, 3 insertions, 3 deletions

diff --git a/gcc/config/epiphany/constraints.md b/gcc/config/epiphany/constraints.md
index e4fda2d..5dc9601 100644
--- a/gcc/config/epiphany/constraints.md
+++ b/gcc/config/epiphany/constraints.md
@@ -98,12 +98,12 @@
        (match_test "REGNO (op) >= FIRST_PSEUDO_REGISTER || REGNO (op) <= 7")))
 
 ;; Constant suitable for the addsi3_r pattern.
+;; No idea why we previously used RTX_OK_FOR_OFFSET with SI, HI an QI
+;; modes.  The instruction in question accepts 11 bit signed constants.
 (define_constraint "Car"
   "addsi3_r constant."
   (and (match_code "const_int")
-       (ior (match_test "RTX_OK_FOR_OFFSET_P (SImode, op)")
-	    (match_test "RTX_OK_FOR_OFFSET_P (HImode, op)")
-	    (match_test "RTX_OK_FOR_OFFSET_P (QImode, op)"))))
+       (match_test "IN_RANGE (INTVAL (op), -1024, 1023)")))
 
 ;; The return address if it can be replaced with GPR_LR.
 (define_constraint "Rra"