49813aad32
As the following testcase shows, we emit a -Wpsabi note about argument passing change since GCC 9, but in reality the ABI didn't change. The alignment is 8 bits in GCC < 9 and 32 bits in GCC >= 9 and the aarch64_function_arg_alignment returns in that case: return MIN (MAX (alignment, PARM_BOUNDARY), STACK_BOUNDARY); so when both the old and new alignment are smaller or equal to PARM_BOUNDARY (or both are larger than STACK_BOUNDARY, just in theory), even when the new one is bigger, it doesn't change the argument passing. So, the following patch changes aarch64_function_arg_alignment to tell the callers the exact old alignmentm so that they can test it if needed. The other aarch64_function_arg_alignment callers either check the alignment for equality against 16-byte alignment (when old alignment was smaller than that and the new one is 16-byte, we want to emit -Wpsabi in all the cases) or the va_arg case which I think is ok now too. 2021-04-16 Jakub Jelinek <jakub@redhat.com> PR target/91710 * config/aarch64/aarch64.c (aarch64_function_arg_alignment): Change abi_break argument from bool * to unsigned *, store there the pre-GCC 9 alignment. (aarch64_layout_arg, aarch64_gimplify_va_arg_expr): Adjust callers. (aarch64_function_arg_regno_p): Likewise. Only emit -Wpsabi note if the old and new alignment after applying MIN/MAX to it is different. * gcc.target/aarch64/pr91710.c: New test. |
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