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The following testcase ICEs on i686-linux, because the HW in that case implements the shift as shifting by 64-bit count (anything larger or equal to number of bits in the first operand's element results in 0 or sign copies), so the machine description implements it as such as well. Now, because shifts/rotates can have different modes on the first and second operand, when the second one has VOIDmode (i.e. CONST_INT, I think CONST_WIDE_INT has non-VOIDmode and CONST_DOUBLE with VOIDmode is hopefully very rarely used), we need to choose some mode for the wide_int conversion. And so far we've been choosing BITS_PER_WORD/word_mode or the mode of the first operand's element, whichever is wider. That works fine on 64-bit targets, CONST_INT has always at most 64 bits, but for 32-bit targets uses SImode. Because HOST_BITS_PER_WIDE_INT is always 64, the following patch just uses that plus DImode instead of BITS_PER_WORD and word_mode. 2026-01-12 Jakub Jelinek <jakub@redhat.com> PR rtl-optimization/123523 * simplify-rtx.cc (simplify_const_binary_operation): Use DImode for VOIDmode shift and truncation counts if int_mode is narrower than HOST_BITS_PER_WIDE_INT rather than word_mode if int_mode it is narrower than BITS_PER_WORD. * gcc.target/i386/pr123523.c: New test.
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