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arm_split_atomic_op handles subtracting a constant by converting it into addition of the negated constant. But if the type of the operand is int and the constant is -1 we currently end up generating invalid RTL which can lead to an abort later on. The problem is that in a HOST_WIDE_INT, INT_MIN is represented as 0xffffffff80000000 and the negation of this is 0x0000000080000000, but that's not a valid constant for use in SImode operations. The fix is straight-forward which is to use gen_int_mode rather than simply GEN_INT. This knows how to correctly sign-extend the negated constant when this is needed. gcc/ PR target/97534 * config/arm/arm.c (arm_split_atomic_op): Use gen_int_mode when negating a const_int. gcc/testsuite * gcc.dg/pr97534.c: New test.
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