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Hi, As analyzed in PR67921, I think the issue is caused by fold_binary_loc which folds: 4 - (sizetype) &c - (sizetype) ((int *) p1_8(D) + ((sizetype) a_23 * 24 + 4)) into below form: ((sizetype) -((int *) p1_8(D) + ((sizetype) a_23 * 24 + 4)) - (sizetype) &c) + 4 Look the minus sizetype expression is folded as negative pointer expression, which seems incorrect. Apart from this, The direct reason of this ICE is in CHREC because of an overlook. In general CHREC supports NEGATE_EXPR for CHREC, the only problem is it uses pointer type for CHREC_RIGHT, rather than sizetype, when building pointer type CHREC. This simple patch fixes the ICE issue. Bootstrap and test on x86 & x86_64. Is it OK? Note, I do think the associate logic in fold_binary_loc needs fix, but that should be another patch. 2015-10-20 Bin Cheng <bin.cheng@arm.com> PR tree-optimization/67921 * tree-chrec.c (chrec_fold_multiply): Use sizetype for CHREC_RIGHT if type is pointer type. 2015-10-20 Bin Cheng <bin.cheng@arm.com> PR tree-optimization/67921 * gcc.dg/ubsan/pr67921.c: New test.
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