[Bug rtl-optimization/55247] [4.8 Regression] internal compiler error: Max. number of generated reload insns per insn is achieved (90)

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55247



--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> 2012-11-10 02:30:16 
UTC ---

Something like this:



diff --git a/gcc/explow.c b/gcc/explow.c

index 6109832..9ec38f9 100644

--- a/gcc/explow.c

+++ b/gcc/explow.c

@@ -84,12 +84,22 @@ plus_constant (enum machine_mode mode, rtx x, HOST_WIDE_INT 

c)

   rtx y;

   rtx tem;

   int all_constant = 0;

+  enum machine_mode zero_extend_mode;



   gcc_assert (GET_MODE (x) == VOIDmode || GET_MODE (x) == mode);



   if (c == 0)

     return x;



+  if (GET_CODE (x) == ZERO_EXTEND)

+    {

+      zero_extend_mode = GET_MODE (x);

+      x = XEXP (x, 0);

+      mode = GET_MODE (x);

+    }

+  else

+    zero_extend_mode = VOIDmode;

+

  restart:



   code = GET_CODE (x);

@@ -195,7 +205,11 @@ plus_constant (enum machine_mode mode, rtx x,

HOST_WIDE_INT

 c)

   else if (all_constant)

     return gen_rtx_CONST (mode, x);

   else

-    return x;

+    {

+      if (zero_extend_mode != VOIDmode)

+    x = gen_rtx_ZERO_EXTEND (zero_extend_mode, x);

+      return x;

+    }

 }

 ^L

 /* If X is a sum, return a new sum like X but lacking any constant terms.

diff --git a/gcc/recog.c b/gcc/recog.c

index ee68e30..d3dd591 100644

--- a/gcc/recog.c

+++ b/gcc/recog.c

@@ -1934,15 +1934,21 @@ int

 offsettable_address_addr_space_p (int strictp, enum machine_mode mode, rtx y,

                   addr_space_t as)

 {

-  enum rtx_code ycode = GET_CODE (y);

+  enum rtx_code ycode;

   rtx z;

-  rtx y1 = y;

+  rtx y1;

   rtx *y2;

   int (*addressp) (enum machine_mode, rtx, addr_space_t) =

     (strictp ? strict_memory_address_addr_space_p

          : memory_address_addr_space_p);

   unsigned int mode_sz = GET_MODE_SIZE (mode);



+  if (GET_CODE (y) == ZERO_EXTEND)

+    y = XEXP (y, 0);

+

+  ycode = GET_CODE (y);

+  y1 = y;

+

   if (CONSTANT_ADDRESS_P (y))

     return 1;