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[Bug tree-optimization/70509] wrong code with extract from a v64qi
- From: "zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 02 Apr 2016 19:54:02 +0000
- Subject: [Bug tree-optimization/70509] wrong code with extract from a v64qi
- Auto-submitted: auto-generated
- References: <bug-70509-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70509
--- Comment #2 from Zdenek Sojka <zsojka at seznam dot cz> ---
(In reply to Zdenek Sojka from comment #0)
> First broken dump seems to be .forwprop, where is:
.forwprop4 , that is. The problem might be that simplify_bitfield_ref() does:
tree-ssa-forwprop.c
...
1793: index = build_int_cst (TREE_TYPE (TREE_TYPE (m)), idx * size);
...
which builds the index of type "unsigned char", which wraps around from 256 to
0.
Is there any reason to have index of type "TREE_TYPE (TREE_TYPE (m))" in that
statement? or am I reading the code incorrectly?