| Message ID | 545C9D80.9070007@arm.com |
|---|---|
| State | New |
| Headers | show |
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index efcefa7..006fb70 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -14318,6 +14318,10 @@ fold (tree expr) if (kind == tcc_constant) return t; + /* Return right away if a TREE_CLOBBER node. */ + if (TREE_CLOBBER_P (t)) + return t; + /* CALL_EXPR-like objects with variable numbers of operands are treated specially. */ if (kind == tcc_vl_exp)
the problem is caused by constant fold of node with TREE_CLOBBER_P be true. according to rtl expander, the purpose of clobber is to mark the going out of scope. if (TREE_CLOBBER_P (rhs)) /* This is a clobber to mark the going out of scope for this LHS. */ for vshuf-v16hi, there will be such node <bb 5>: r ={v} {CLOBBER}; while the new added "fold_all_stmts" since r216728 will invoke generic "fold" and that function in fold-const.c has a bug when folding CONSTRUCTOR. we should not do fold if the tree node is also with TREE_THIS_VOLATILE (t) be true, otherwise we will generate extra insn during expand. for example, above assignment will be transformed into r = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; while OImode immediate move is not supported when "-mcpu=cortex-a9 -mfloat-abi=softfp -mfpu=neon" specified, thus trigger "insn_invalid_p" error for this testcase. bootstrap ok on x86-64, no regression. ICE on arm gone away. ok to trunk? gcc/ PR tree/63676 fold-const.c (fold): Do not fold node when TREE_CLOBBER_P be true.