[Bug tree-optimization/29740] [4.1 Regression] ICE in find_or_generate_expression, at tree-ssa-pre.c:1472

[rguenth at gcc dot gnu dot org]

------- Comment #1 from rguenth at gcc dot gnu dot org  2006-11-06 14:58 -------
#1  0x00000000008aad40 in find_or_generate_expression (block=0x2b50ce8c4c80, 
    expr=0x2b50ce8d9210, stmts=0x2b50ce8d9ab0)
    at /space//rguenther/src/svn/gcc-4_1-branch/gcc/tree-ssa-pre.c:1468
1468          gcc_assert (UNARY_CLASS_P (genop)
(gdb) bt
#2  0x00000000008aaf71 in create_expression_by_pieces (block=0x2b50ce8c4c80, 
    expr=0xd0cd10, stmts=0x2b50ce8d9ab0)
    at /space//rguenther/src/svn/gcc-4_1-branch/gcc/tree-ssa-pre.c:1545
#3  0x00000000008ab873 in insert_into_preds_of_block (block=0x2b50ce8c4400, 
    node=0xd147d8, avail=0xd169d0, tmpname=0xa84d8f "prephitmp")
    at /space//rguenther/src/svn/gcc-4_1-branch/gcc/tree-ssa-pre.c:1684
#4  0x00000000008abff3 in insert_aux (block=0x2b50ce8c4400)
    at /space//rguenther/src/svn/gcc-4_1-branch/gcc/tree-ssa-pre.c:1883
#5  0x00000000008ac0d8 in insert_aux (block=0x2b50ce8c4c80)
    at /space//rguenther/src/svn/gcc-4_1-branch/gcc/tree-ssa-pre.c:1915
#6  0x00000000008ac0d8 in insert_aux (block=0x2b50ce8c4100)
    at /space//rguenther/src/svn/gcc-4_1-branch/gcc/tree-ssa-pre.c:1915
#7  0x00000000008ac0d8 in insert_aux (block=0x2b50ce8c4000)
    at /space//rguenther/src/svn/gcc-4_1-branch/gcc/tree-ssa-pre.c:1915
#8  0x00000000008ac1a9 in insert ()
    at /space//rguenther/src/svn/gcc-4_1-branch/gcc/tree-ssa-pre.c:1937
(gdb) call debug_tree (genop)
 <ssa_name 0x2b50ce8cc930
    type <integer_type 0x2b50ce708580 unsigned int sizes-gimplified public
unsigned SI
        size <integer_cst 0x2b50ce6f9a50 constant invariant 32>
        unit size <integer_cst 0x2b50ce6f9570 constant invariant 4>
        align 32 symtab 0 alias set -1 precision 32 min <integer_cst
0x2b50ce6f9b40 0> max <integer_cst 0x2b50ce6f9b10 4294967295>
        pointer_to_this <pointer_type 0x2b50ce8bf000>>
    var <var_decl 0x2b50ce8bf4d0 D.1626> def_stmt <modify_expr 0x2b50ce8c3870>
    version 39
    value 0x2b50ce8d9210>


      gcc_assert (UNARY_CLASS_P (genop)
                  || BINARY_CLASS_P (genop)
                  || COMPARISON_CLASS_P (genop)
                  || REFERENCE_CLASS_P (genop)
                  || TREE_CODE (genop) == CALL_EXPR);

(gdb) up
(gdb) call debug_generic_expr (expr)
VH.25 * VH.30

Created value VH.24 for extD.1610_5
Created value VH.25 for *VH.24
Created value VH.30 for D.1626_39  
...
compute_antic required 3 iterations
Found partial redundancy for expression VH.25 * VH.30
Skipping insertion of phi for partial redundancy: Looks like an induction
variable

we obviously don't expect an SSA name here...  but why are we value-numbering
loads in 4.1 here?


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dberlin at gcc dot gnu dot
                   |                            |org
      Known to fail|                            |4.1.0 4.1.1 4.1.2
      Known to work|                            |4.0.3 4.2.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29740