Thanks for the review and commit. All the best, Peixin
-----Original Message----- From: Richard Sandiford [mailto:richard.sandif...@arm.com] Sent: 2020年8月13日 0:25 To: qiaopeixin <qiaopei...@huawei.com> Cc: gcc-patches@gcc.gnu.org Subject: Re: [PATCH] AArch64: Add if condition in aarch64_function_value [PR96479] qiaopeixin <qiaopei...@huawei.com> writes: > Hi, > > The test case vector-subscript-2.c in the gcc testsuit will report an ICE in > the expand pass since '-mgeneral-regs-only' is incompatible with the use of > V4SI mode. I propose to report the diagnostic information instead of ICE, and > the problem has been discussed on PR 96479. > > I attached the patch to solve the problem. Bootstrapped and tested on > aarch64-linux-gnu. Any suggestions? Thanks, pushed. I was initially sceptical because raising an error here and in aarch64_layout_arg is a hack. Both functions are just query functions and shouldn't have any side effects. The approach we took for FP modes seemed better: we define the FP move patterns unconditionally, and raise an error if we try to emit an FP move with !TARGET_FLOAT. This defers any error reporting until we actually try to generate code that depends on TARGET_FLOAT. But I guess SIMD stuff is different. There's no reason in principle why you can't use: unsigned short __attribute__((vector_size(8))) *within* a function with -mgeneral-regs-only. It would just need to be emulated, in the same way as for: unsigned short __attribute__((vector_size(4))) So it would be wrong to define the SIMD move patterns unconditionally and raise an error there. So all in all, I agree this is the best we can do given the current infrastructure. Thanks, Richard
