[PATCH 4/6] nios2: Fixes for RTL checking

[Segher Boessenkool <segher@kernel.crashing.org>]

You cannot call REGNO on something that isn't a REG, and you cannot
call INTVAL on something that isn't a CONST_INT.

The way I fixed nios2_alternate_compare_const is admittedly a bit lame.


2017-02-21  Segher Boessenkool  <segher@kernel.crashing.org>

	* config/nios2/nios2.c (nios2_simple_const_p): Returns false if the
	argument isn't a CONST_INT.
	(nios2_alternate_compare_const): Set *alt_code and *alt_op to code
	and op if op is not a CONST_INT.
	(nios2_valid_compare_const_p): Return false if the argument isn't
	a CONST_INT.
	(ldstwm_operation_p): Return false if first_base is not a REG or
	if first_offset is not a CONST_INT.

---
 gcc/config/nios2/nios2.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gcc/config/nios2/nios2.c b/gcc/config/nios2/nios2.c
index e1b0372..75eeee3 100644
--- a/gcc/config/nios2/nios2.c
+++ b/gcc/config/nios2/nios2.c
@@ -1416,6 +1416,8 @@ nios2_option_override (void)
 static bool
 nios2_simple_const_p (const_rtx cst)
 {
+  if (!CONST_INT_P (cst))
+    return false;
   HOST_WIDE_INT val = INTVAL (cst);
   return SMALL_INT (val) || SMALL_INT_UNSIGNED (val) || UPPER16_INT (val);
 }
@@ -1753,6 +1755,13 @@ nios2_alternate_compare_const (enum rtx_code code, rtx op,
 			       enum rtx_code *alt_code, rtx *alt_op,
 			       machine_mode mode)
 {
+  if (!CONST_INT_P (op))
+    {
+      *alt_code = code;
+      *alt_op = op;
+      return;
+    }
+
   HOST_WIDE_INT opval = INTVAL (op);
   enum rtx_code scode = signed_condition (code);
   bool dec_p = (scode == LT || scode == GE);
@@ -1788,6 +1797,9 @@ nios2_alternate_compare_const (enum rtx_code code, rtx op,
 static bool
 nios2_valid_compare_const_p (enum rtx_code code, rtx op)
 {
+  if (!CONST_INT_P (op))
+    return false;
+
   switch (code)
     {
     case EQ: case NE: case GE: case LT:
@@ -4558,6 +4570,8 @@ ldstwm_operation_p (rtx op, bool load_p)
 	  if (!split_mem_address (XEXP (mem, 0),
 				  &first_base, &first_offset))
 	    return false;
+	  if (!REG_P (first_base) || !CONST_INT_P (first_offset))
+	    return false;
 	  base_reg = first_base;
 	  inc_p = INTVAL (first_offset) >= 0;
 	}
-- 
1.9.3