[Bug c/47140] New: error: conversion of register to a different size

[regehr at cs dot utah.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47140

           Summary: error: conversion of register to a different size
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: reg...@cs.utah.edu
                CC: cheny...@cs.utah.edu


There are several verify_stmts failed problems pending, but this one looks
different.  Apologies if it's a dup.


[reg...@gamow tmp434]$ current-gcc -c -O2 small.c

small.c: In function 'uint321':
small.c:33:5: error: conversion of register to a different size
VIEW_CONVERT_EXPR<int>(D.2762_32);

pretmp.6_33 = VIEW_CONVERT_EXPR<int>(D.2762_32);

small.c:33:5: internal compiler error: verify_stmts failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[reg...@gamow tmp434]$ current-gcc -v

Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r168380-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r168380-install
--program-prefix=r168380- --enable-languages=c,c++
Thread model: posix
gcc version 4.6.0 20101231 (experimental) (GCC) 

[reg...@gamow tmp434]$ cat small.c

typedef short int int16_t;
typedef int int32_t;
typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;

static int32_t
safe_mod_func_int32_t_s_s (int32_t si1, int16_t si2)
{
  return si2 == 0 || si1 == -2147483647 - 1 && si2 ? si1 : si1 + si2;
}

static uint8_t
safe_add_func_uint8_t_u_u (uint8_t ui1, uint8_t ui2)
{
  return ui1 + ui2;
}

static uint16_t
safe_sub_func_uint16_t_u_u (uint16_t ui1, uint8_t ui2)
{
  return ui1 - ui2;
}

int16_t g_32;
int16_t g_76[7][10] = {
};

volatile int32_t g_98[1][1] = {
};

volatile int32_t *g_97 = &g_98[0][0];

int uint321 (void)
{
  for (0;; 1)
    *g_97 =
      safe_mod_func_int32_t_s_s (safe_add_func_uint8_t_u_u
                 (1,
                  func_21 (g_32,
                       g_76[5][5])) >=
                 safe_sub_func_uint16_t_u_u (&g_97 == 0, 1),
                 0);
}