Hello Everyone,
I am currently working on OpenRISC port of GCC and I am trying to
add more constraints to the machine-dependent part and the default
number of constrant seem to be only 30 (and obviously I have more than
30 constraints, and thus it was failing). I tried making this a #define
value and moved this to the machine dependent part. This is advantageous
because now the backend designer has more flexibility.
Here is the patch for it (if a value is not provided, then the
default value of 30 is assumed). I tried to build this for x86 and arm
and they seem to work fine with no problems.
Here is the patch for it (I am working on GCC 4.0.2).
==
diff -Naur gcc.old/recog.c gcc.new/recog.c
--- gcc.old/recog.c 2008-04-14 19:57:58.5 -0400
+++ gcc.new/recog.c 2008-04-14 20:08:31.34375 -0400
@@ -2039,7 +2039,7 @@
= (recog_data.constraints[i][0] == '=' ? OP_OUT
: recog_data.constraints[i][0] == '+' ? OP_INOUT
: OP_IN);
-
+
gcc_assert (recog_data.n_alternatives = MAX_RECOG_ALTERNATIVES);
}
diff -Naur gcc.old/recog.h gcc.new/recog.h
--- gcc.old/recog.h 2008-04-14 19:57:58.5 -0400
+++ gcc.new/recog.h 2008-04-14 19:54:44.828125000 -0400
@@ -20,7 +20,12 @@
02111-1307, USA. */
/* Random number that should be large enough for all purposes. */
-#define MAX_RECOG_ALTERNATIVES 30
+
+#ifdef TARGET_MAX_RECOG_ALTERNATIVES
+#define MAX_RECOG_ALTERNATIVES TARGET_MAX_RECOG_ALTERNATIVES
+#else
+#define MAX_RECOG_ALTERNATIVES 30
+#endif
/* Types of operands. */
enum op_type {
diff -Naur gcc.old/target-def.h gcc.new/target-def.h
--- gcc.old/target-def.h2008-04-14 19:58:00.46875 -0400
+++ gcc.new/target-def.h2008-04-14 19:54:45.71875 -0400
@@ -187,6 +187,11 @@
#define TARGET_ASM_MARK_DECL_PRESERVED hook_void_constcharptr
#endif
+#ifndef TARGET_MAX_RECOG_ALTERNATIVES
+#define TARGET_MAX_RECOG_ALTERNATIVES 32
+#endif
+
+
#define TARGET_ASM_ALIGNED_INT_OP \
{TARGET_ASM_ALIGNED_HI_OP, \
TARGET_ASM_ALIGNED_SI_OP, \
==
Thanks,
Balaji V. Iyer.
--
Balaji V. Iyer
PhD Student,
Center for Efficient, Scalable and Reliable Computing,
Department of Electrical and Computer Engineering,
North Carolina State University.
