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r15-4601 added match.pd simplification of some TRUNC_DIV_EXPR expressions into EXACT_DIV_EXPR, so bitintlower can now encounter even those. From bitint lowering POV the fact that the division will be exact doesn't matter, we still need to call at runtime the __divmodbitint4 API and it wouldn't simplify there anything to know it is exact if we duplicated that, so the following patch lowers EXACT_DIV_EXPR exactly as TRUNC_DIV_EXPR. I think we don't need to backport this unless something introduces EXACT_DIV_EXPR on BITINT_TYPEd expressions on the 14 branch as well. 2024-11-19 Jakub Jelinek <jakub@redhat.com> PR middle-end/117571 * gimple-lower-bitint.cc (bitint_large_huge::lower_muldiv_stmt, bitint_large_huge::lower_stmt, stmt_needs_operand_addr, build_bitint_stmt_ssa_conflicts, gimple_lower_bitint): Handle EXACT_DIV_EXPR like TRUNC_DIV_EXPR. * gcc.dg/bitint-114.c: New test. |
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