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The problem here is two fold. With RISCV32, 32bit const_int are always signed extended to 64bit in HWI. So that means for SINGLE_BIT_MASK_OPERAND, it should mask off the upper bits to see it is a single bit for !TARGET_64BIT. Plus there are a few locations which forget to call trunc_int_for_mode when generating a SImode constant so they are not sign extended correctly for HWI. The predicates single_bit_mask_operand and not_single_bit_mask_operand need get the same handling as SINGLE_BIT_MASK_OPERAND so just use SINGLE_BIT_MASK_OPERAND. OK? Built and tested on riscv32-linux-gnu and riscv64-linux-gnu with --with-arch=rvNimafdc_zba_zbb_zbc_zbs where N is replaced with 32 or 64. Thanks, Andrew Pinski gcc/ChangeLog: PR target/106586 * config/riscv/predicates.md (single_bit_mask_operand): Use SINGLE_BIT_MASK_OPERAND instead of directly calling pow2p_hwi. (not_single_bit_mask_operand): Likewise. * config/riscv/riscv.cc (riscv_build_integer_1): Don't special case 1<<31 for 32bits as it is already handled. Call trunc_int_for_mode on the upper part after the subtraction. (riscv_move_integer): Call trunc_int_for_mode before generating the integer just make sure the constant has been sign extended corectly. (riscv_emit_int_compare): Call trunc_int_for_mode after doing the addition for the new rhs. * config/riscv/riscv.h (SINGLE_BIT_MASK_OPERAND): If !TARGET64BIT, then mask off the upper 32bits of the HWI as it will be sign extended.
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