[Bug rtl-optimization/69083] New: ICE at -O3 in 64-bit mode on x86_64-linux-gnu (verify_gimple failed)

[chengniansun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69083

            Bug ID: 69083
           Summary: ICE at -O3 in 64-bit mode on x86_64-linux-gnu
                    (verify_gimple failed)
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com
  Target Milestone: ---

The following code crashes the trunk at -O3 in 64-bit mode on x86_64-linux-gnu.

$: gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20151229 (experimental) [trunk revision 231989] (GCC) 
$:
$: gcc-trunk -c -w small.c -O3 
small.c: In function ‘fn1’:
small.c:3:6: error: conversion of register to a different size
 void fn1() {
      ^~~

VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_84 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_85 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_86 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_87 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_88 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_89 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_90 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_91 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_93 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_94 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_95 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_96 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_97 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_98 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_99 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: error: conversion of register to a different size
VIEW_CONVERT_EXPR<<unnamed type>>(_6);

_100 = VIEW_CONVERT_EXPR<<unnamed type>>(_6);
small.c:3:6: internal compiler error: verify_gimple failed
0xb2ff16 verify_gimple_in_cfg(function*, bool)
        ../../gcc-trunk/gcc/tree-cfg.c:5119
0xa23c37 execute_function_todo
        ../../gcc-trunk/gcc/passes.c:1958
0xa2452b execute_todo
        ../../gcc-trunk/gcc/passes.c:2010
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$: 
$: cat small.c
int a, b, d, e;
short c, f;
void fn1() {
  int j;
  for (; e; e++) {
    j = 0;
    for (; j < 3; j++) {
      f = 7 >> b ? a : b;
      d |= c == 1 ^ 1 == f;
    }
  }
}
$: