On Mon, 2024-01-15 at 15:10 +0800, chenxiaolong wrote: > At 14:42 +0800 on the first day of 2024-01-15, Xi Ruoyao wrote： > > On Mon, 2024-01-15 at 14:32 +0800, YunQiang Su wrote: > > > Xi Ruoyao <xry...@xry111.site> wrote at 12:11pm on Monday, January > > > 15, 2024： > > > > On Mon, 2024-01-15 at 09:29 +0800, chenxiaolong wrote: > > > > > At 21:13 +0800 on Saturday, 2024-01-13, Xi Ruoyao wrote： > > > > > > At 15:28 +0800 on Saturday 2024-01-13, chenxiaolong wrote： > > > > > > > gcc/testsuite/ChangeLog: > > > > > > > > > > > > > > * gcc.dg/pr104992.c: Added additional "-mlsx" compilation > > > > > > > options. > > > > > > > * gcc.dg/signbit-2.c: Dito. > > > > > > > * gcc.dg/tree-ssa/scev-16.c: Dito. > > > > > > > * gfortran.dg/graphite/vect-pr40979.f90: Dito. > > > > > > > * gfortran.dg/vect/fast-math-mgrid-resid.f: Dito. > > > > > > > > > > > > I don't feel it right about the changes to pr104992.c and > > > > > > scev-16.c > > > > > > because no other architectures add special options there. > > > > > > Why are we > > > > > > so special? > > > > > Because on the LoongArch architecture, GCC requires the > > > > > addition of > > > > > vectorization options in order to generate vector code. Use the > > > > > check_effective_target_vect_cmdline_needed command in the > > > > > lib/target- > > > > > supports.exp file to set whether the command line option is > > > > > needed to > > > > > enable vectorizations. For example, ia64,x86,aarch64, and riscv > > > > > architectures, vectorization is enabled by default. > > > > > > > > But no. The default baseline of 32-bit x86 is i686, which is > > > > basically > > > > a Pentium III launched in 1999 without any vector instructions. > > > > > > > > We are still missing something here. > > > > > > > There is a line > > > #define vector __attribute__((vector_size(4*sizeof(int)))) > > > I guess it is the syntax needs to be supported. > > > > This is always supported. If the target does not have vector > > instructions GCC will just expand vector arithmetic as a loop. > > > > Maybe we should just move this test into gcc.dg/vect where the > > framework > > automatically add options like -mlsx or -msse2? > > > > The "-mlsx" option is turned on by default after vectorization testing > is turned on. However, the use of dg-options in some files resets the > compilation options for testing this file. Therefore, to detect > vectorization on LoongArch, it is necessary to add an additional "- > mlsx" option.
Then it should use dg-additional-options instead of dg-options. -- Xi Ruoyao <xry...@xry111.site> School of Aerospace Science and Technology, Xidian University
